BMW i3 Wheels and Tires: What you need to know

You get a better view of just how tall and thin the tires on the i3 are without the body in place

Note: This was originally posted on February 17th, 2014. I have had so many people message me about tire and wheel size information that I thought it would be a good idea to repost it.

One of the more talked about features of the i3 is its tires. Not for decades has there been a car with such tall and narrow wheels and tires. Since the 70's, the trend has been for tires to get wider and wider, and that is especially true for performance cars since more rubber on the ground generally means better roadholding.

Performance is critical for any BMW

Then came along the i3. It's BMW's quirky-looking mega-city car, and the first electric car from the brand. With all the incredibly unique aspects of this vehicle, it's still the tires that catch most peoples attention when they first see it in person. They just aren't used to seeing such tall and thin tires on a car, let alone a BMW. Actually, they look like they would be better suited for a motorcycle, but that's just because we just aren't accustomed to seeing tires like this. Rest assured the BMW engineers have done their homework, and the tires do exactly whet they were designed to. They provide excellent grip while increasing the cars efficiency with lower aerodynamic drag.

BMW commissioned Bridgestone to make special tires just for the i3. Even though they carry the "Ecopia" name, they are different from any other tire that Bridgestone makes. Franco Annunziato, CEO and President of Bridgestone Europe said: “The BMW i3 is very much a car for the future. Developing a unique tire for this unique vehicle was therefore an enormously challenging but also rewarding experience. Energy efficiency is an important development criteria for all our tires at Bridgestone. However, it becomes an even more critical factor in an electric car. Which is why we have put all our knowhow, skill and passion into developing this unique tire. One that we are confident delivers the premium performance, safety and economy towards consumers who have come to expect it from both brands.” As for performance, since BMW wanted to use a narrow tire for efficiency but not sacrifice on performance, they needed to use a much taller tire than most would expect on a car of this size. By increasing the height, they were able to increase the contact patch so it is similar to the contact patch of a MINI Cooper, which is well known for its great handling. Talking about the i3's tires and their grip on the road, Ulrich Krantz, BMW's product manager for BMW i said: "It’s not rocket science. All that matters is the size of the contact patch. The 19-inch tires may be skinny, but their tall height generates the same contact patch as a low-section 16-inch MINI tire". 
 

1) Standard Mega 19" #427  2) Tera World 19" #428   3) Giga World 19" #429   4) Optional 20" Sport  #430

So with the question of performance behind us let's focus on the tire and wheel sizes and combinations. BMW doesn't make it easy here. The standard wheel on the base Mega World interior is a BMW i Star Spoke (Style 427) wheel that is 19" x 5" on the front and rear and they use the 155/70 R19 84Q Bridgestone Ecopia EP600 all season tires that were specifically designed for the i3. Here is where it starts to get tricky. If you get a BEV i3 with the standard Mega trim, the wheels and tires are the same size on the front & rear, but if you get any other interior trim (Giga or Tera Worlds) the rear wheels are slightly wider (19" x 5.5") and the tires are wider and lower profile (175/60 R19 86Q). Also, if you get the standard Mega World trim but get the range extender, you also get the wider wheels and tires on the rears. Then there are the optional 20" Double Spoke sport wheels. They are also staggered in size and use Bridgestone Ecopia EP500 summer tires, not all-seasons. Up front you get 20" x 5" wheels and 155/60 R20 80Q tires and in the back there are 20" x 5.5" wheels and 175/55 R20 85Q tires.

EP600's on left & winter tire on right

So the wheel and tire size is staggered in every instance except for a base i3 with Mega World trim and no range extender, right? Kinda. Everything above applies for the standard 19" Bridgestone Ecopia EP600 and 20" Ecopia EP500 tires but not if you want/need winter tires. There will be two different winter tires available (Blizzak LM500 & Blizzak NV, though I'm not sure they will both be available in the US). However they will only be available in 155/70 R19, so if you want the winter tires you'll be using the same size front and rear tire. Furthermore, if you order your i3 with the optional 20" Sport wheels ($1,300 option) and you live in an area that would necessitate winter tires, then you'll need to buy a set of 19" wheels also, since there are no 20" winter tires that will fit the 20" sport wheels. I have spoken to BMW product managers about this and was told bluntly that the 20" tires are summer tires, not all-seasons and they will not perform well in snow and ice. So if you were considering the 20" sport wheels for your i3 and you live in a cold weather area, understand you'll likely need to spend another $2,000 or so to get a set of winter tires & wheels, since you can't just buy the tires. If you have any of the three 19" wheels then all you need to do is buy the winter tires and you can swap them for the winter and put your Ecopia EP600's back on in the spring.

The 20" Sport #430 Wheels

One more thing. None of the tires are runflats, and the i3 does not have a spare tire. What you do get is a can of "Fix-a-Flat" tire sealant and compressed air, which if used properly should get you at least as far as your nearest BMW dealer which will likely be the only place that stocks there rare tire sizes. If not used properly it will blow up in your hand leaving you covered with the sticky goo meant to seal the hole and you'll be calling Roadside Assistance. Finally, if you are wondering how well the i3 does in the snow, below are a couple videos that were just posted on YouTube by a new i3 owner in Norway. I have also talked with a couple people that have driven the i3 in the snow and they have remarked about how well it has done, likely another benefit of the tall, thin tires that slice through the snow instead of rolling over it.

Snow chains are available for the 19" tires

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Is The BMW i3 "Too European" For the US Market?

It's been called edgy, futuristic, polarizing, ground breaking and even flat out hideous. It has funky lines, rear coach (suicide) doors that can't be opened unless the front doors are and rear windows that are permanently closed. The nose has a pronounced "underbite" that any respectful orthodontist would love to correct and the tires are so skinny they look like they should be on something coming out of BMW Motorrad, and certainly not on a proper BMW automobile.

The internet is full of extremely harsh criticism of the i3's exterior styling. However most seem to praise the interior for it's modern, stylish and open feel, especially for such a small car. I don't think I've read a single article where the author didn't at least approve of the interior design, while most gave it very high marks. The term "Scandinavian loft" has been used frequently to describe the modern, open feeling the i3's interior offers.

But then there's the unconventional exterior styling that many people just can't get past. I have to admit, I didn't love it when I first saw it, but I never actually hated it. Then I felt a lot better once I saw it in person and got to drive it. The styling has definitely grown on me and I genuinely like how it looks now.  Others don't fell the same way. In fact, the i3's unique appearance has been discussed ad nauseum since its introduction. Here are a few examples:


On this message board, one person asked the question: Did they try to make it ugly?

Brad Berman of plugincars.com: Did BMW screw up the visual design of i3 electric car?

Perhaps one of the most offensive stories was from The Slate when they wrote: BMW i3 review: Electric car is a cheap, ugly Tesla Model S with an SUV on the side

Would this Citroen be popular in the US?

Then I started thinking about all the criticism and began to wonder if it is mostly driven by American opinions. BMW has consistently maintained the i3 is a "city car". Unlike Europe, city cars just haven't been accepted here yet. The European roads are full of small cars that would certainly appear "unconventional" to American motorists. Take smart for instance. There are smart cars everywhere you look in Europe, yet smart can barely sell a few hundred cars a month in the entire US. Also, many of the cars there look a bit more modern than what you typically find on American roads. Are Europeans just more accepting of new ideas and styling that pushes the limits of acceptability? Is form following function an easier sell to the European car buyer than it is to their American counterpart?

John Voelcker, editor of Green Car Reports and one of the industries most respected journalists covering the green car and alternative powertrain scene recently wrote this: 

"I'd agree that the BMW i3 is the best city car yet developed. Which is fine for Europe. The problem is that in North America, virtually no one has ever said, "Honey, we need to go buy a city car!"

Will America warm up to the unconventional BMW i3?

This does make sense but I'd argue that while it is a "city car", it is just as well served for the outlying suburbs of the big cities, making it a great commuter car for the daily grind, while still offering the spirited driving experience many want for the weekend joy ride. Which leads to the next questionable decision BMW made which is likely part of the reason so many people have been critical and that's the range. You can't go too far on that weekend cruise unless you paid the additional $3,850 and got the range extender. The EPA range rating hasn't been announced yet but it's widely expected that the i3's electric range will be officially pegged at about 80 to 85 miles per charge. America's a big country and with gasoline relatively cheap compared to the average price in Europe it's common to drive hundreds of miles at a clip here. I believe if BMW would have increased the i3's range a bit, so the EPA range rating was 100 or more miles, they would have eliminated a lot of the negativity surrounding the car so far. Of course the Europeans would like more range also (who doesn't?). It just seems less important there since they are likely to drive less than we do in the US and some would argue that European customers look at a car purchase more pragmatically in many cases.

BMW CEO Reithofer introduces the i3

Will the "unique" styling and short range conspire to limit the i3's success in the US market? Only time will tell. There will certainly be an initial surge of orders but once they are filled will the i3 continue to attract eco-conscious buyers to the brand. According to BMW, i3 ordering has been robust and they have over 11,000 orders in the bank worldwide. US ordering has just recently begun and the first deliveries are due here in only a few weeks but BMW hasn't said how many of the 11,000 orders have come from American customers.  BMW must be happy with i3 sales so far though because they recently ordered two more Engle molding machines that make i3 body shell components. They are only about six months into production so if they need to buy more production machinery already, that is likely a good sign.

Ready or not America, here i come!

What do you think? Do you like the i3's appearance? Do you hate it or are you in the middle? Will it be more accepted by European customers or will it have universal appeal? Let me know in the comments below.

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Bridgestone's "Ologic Technology" and the i3

Much has been made about the tall narrow tires on the BMW i3. They are really unlike any tire on any other car currently in production and they certainly don't look like they belong on a BMW. However BMW and Bridgestone did their homework on this, and accomplished the goals they set out to. That was to develop a tire that is not only efficient, but also delivers the performance expected of any BMW.

How did they do it? Ologic technology. Yep, they developed something so new and advanced you have never even heard of it before! So while I as the Geneva Motor Show a few weeks ago, I made it a point to stop by the Bridgestone exhibit to ask about this new mysterious "Ologic Tech". As I approached the Bridgestone area, I could see they had a Capparis White i3 on display with it all lettered up promoting this new Ologic technology, and they even had an award in a case next to it that proudly displayed that Bridgestone won the 2014 Tire Technology International award for Tire Technology of the year! Fantastic! I was even more pumped up to find out what this new Ologic technology was. Could it be a new special rubber compound or tread pattern?  I was about to find out.


Tire Technology International Awards 2014 winner interview – Tire Technology of the Year

So after asking the information desk for someone to interview I was introduced to a Brigestone product manager to answer my questions. I didn't waste any time. My first question was: What exactly is Ologic technology? I don't have the exact words he used but to paraphrase he basically said "Ologic Technology is our way of creating an efficient tire that still offers optimum performance. By using a very tall narrow tire we simultaneously reduce drag, rolling resistance and tire deformation. The height of the tire in relation to the width also increases the contact patch which allows for retain the dynamic driving characteristics of a much wider tire" So Ologic is just a name of a concept, not any specific rubber compound or such? Yes. Alright well that was a little let down because I figured I was going to get a lesson on rubber or tread or something other than what I heard.

So why are they so special? They must have done something right to win the Tire Technology of the Year award, no? Here is an excerpt of how Bridgestone explains why these are indeed special:

"A Unique Concept for a Unique Car
 
BMW has achieved a genuine milestone with the i3 electric car. Doing justice to its unprecedented levels of both efficiency and performance demanded more than just a new tyre but an entire new tyre concept. Bridgestone’s answer came in the form of the ologic technology, which capitalises on the synergies of a large diameter coupled with a narrow tread design. The result is a tyre that delivers significant improvements in aerodynamics and rolling resistance, while still offering outstanding grip in wet weather conditions.
Combining a large diameter with a narrow tread pattern has several advantages. While the tread on smaller diameter tyres is typically inclined to excessive movement or “deformation” during driving, the larger diameter and higher belt tension significantly reduce tyre deformation and therefore conserve energy that is otherwise lost through internal friction which helps to reduce rolling resistance. By the same token, the narrow tread concept improves aerodynamics. The most spectacular achievement, however is that these improvements do not involve a trade-off in terms of safety. The tyre’s long contact patch (relative to its narrow width),  revolutionary tread design and compound still ensure outstanding grip in both wet and dry conditions."

They have obviously done something right because even though they look like they would be better suited on a motorcycle, the i3 handles exceptionally with them. I've spoken to quite a few people now that have had an i3 on a race track and all of them were genuinely surprised at how well the car performed. In a few weeks I should be taking delivery of my i3 and I can the really put the "Ologic Technology" to the test. :)

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An Aerospace Engineer from the UK Compares the i3 and the i3 REx

 

Lucas flying formation in the Crimea

Lukas Willcocks is a member of the BMW i3 Forum and when I noticed that he posted about having the opportunity to take both an i3 and an i3 REx each for 24 hour test drives I asked him if he wanted to offer his thoughts and comparing them here. What I didn't know was that Lukas is an aerospace engineer. A few of my friends are engineers and the one thing I've learned about them is not to ask a question about something without expecting an answer that involves thoroughly explaining every aspect of the subject. Well, I found Lucas is not very different from my friends! :) His response was about three times as long as any post I've ever put up here and below is actually the condensed version! Warning: We're going off into technical geek land here folks! Special thanks to Lukas for the time and effort he put into this guest post:

To REX or not to REX: 24h with the BMW i3 BEV and another 24h with the BMW i3 REX:

Greetings from darkest Lincolnshire in the English Midlands. Winter this year is mild but very very wet and windy! Educationally, my background is in aerospace engineering but long before that I helped my father fixing old Land Rovers in the Kalahari and later Fiat Twin cams and VW GTis in the EU. I'd always found rally and race cars exciting and in recent years had the privilege of racing in historic motorsports with a 1969 Lancia Fulvia HF.

Colin Chapman (of Lotus racing car fame) is quoted as saying to his engineers “add lightness!” In fact the quote is from Sir Geoffrey De Havilland who gave the world the amazing wooden composite Mosquito WW2 fighter bomber- a machine that could leave fighter aircraft for dead. He also pioneered the first Jet Airliner the DH Comet 1: http://en.wikipedia.org/wiki/De_Havilland_Comet

Aerospace is about efficiency and optimization for specific roles. Whatever the debate on the environment, the world is attempting to move towards more sustainable living. Only 8% of the planet is suitable for arable farming and we all hate traffic jams. Conurbations are increasing at an alarming rate. My old home of Gaborone Botswana had just 40,000 people in the 1970s – now it it has well over 250,000. That country (the size of Texas or France) had 10 miles of tarmac road. Now it has the Trans Kalahari highway!

No cyclist or pedestrian likes petrol or diesel fumes. Electric cars are seen as a way of improving air quality in built up areas. That's all well an good as long as folk don't claim they are emission free vehicles! Most countries still rely on coal fired power stations and acid rain and CO2 is still produced when an EV is used. Even California is not 100% Solar PV / Wind farm dependent.

What is the most efficient means of getting from A to B? An interesting question and much depends on the task – is it to transport 40 tonnes of produce to market 1000 miles away or 2 miles to the grocery store to pick up some tomatoes for lunch? I recall a study that said even cyclists put out at least 15g/km CO2 based on toast consumption!

Intro over!

My thanks go to Hamish of BMW Soper in Lincoln UK who provided the i3 BEV in white which was fitted with lots of toys! And also to Chris Whitmore of BMW Statstone Derby UK for the loan of the grey i3 REX.

So how did the BEV compare with the REX?

That is the ultimate question on most potential owner's minds. Interestingly both cars when fully charged used the same amount of energy on the 29 mile commute to work. The BEV was quick but it's advantage over the slightly heavier REX was not noticeable in normal use.  Both cars had the same tyres front and rear so there was no Cd advantage for the BEV either. Unless you go to the Drag Strip regularly, I very much doubt any driver would notice a difference between the BEV and REX in acceleration terms. If anything the REX felt a little more planted in the corners but this may have been subjective. The rear motor/RWD layout allows far more steering angle than a regular vehicle so the turning circle is very tight at low speed. In muddy conditions it is possible for the traction control to give up and the tail does wag a little if you are too enthusiastic with the go faster pedal.

The biggest change is when you get down to around 6 miles of range. In the BEV there is mild panic even in Eco Pro Plus mode. In the REX the motorcycle engine kicks in with an annoying drone but it is not really noticable above 40 mph.  Some were concerned about speed restriction reports when the REX gets down at lower battery charge levels. I tried 0-50mph max acceleration and this seemed unaffected but there was on screen advice to go easy on the throttle pedal to enable battery charge level maintenance. It could well be that 70 mph uphill on a freeway would not be sustainable at these lower charge levels. That said,  my return journey was with REX activated manually at around 30% SOC. It did not maintain it precisely but achieved around 27% SOC over the 29 miles. Refueling was done at the same Shell station with same grade of petrol - tank was topped off both before and after commute. Economy on REX is not that great but it is really there to get you home or to nearest fast charger.

My guess is the battery in a REX will be in a far better state than that of a BEV after 3 years of similarly hard use. The damage associated with running the LiON batteries to an absolute minimum are more likely to be avoided by the car that maintains charge at low levels.It should also be noted that when the doors are unlocked the charge goes down whether plugged in or not because displays and system heating are activated and run off the main battery.  This might be fixed by a BMW phone app for users who wish to configure for a trip whilst charging. Showing off all the gizmos to your work colleagues will also deplete charge! 

Overall I like the purity of the BEV and only wish it could better 60 miles in mild winter commute. If it could do 100 miles at 60 to 70 mph I would buy one right away. As it stands if committing to an i3, I'd have to go for the REX and downgrade on the options list.

Now for some thoughts on the i3 in general: 

What can we compare the BMW i3 with? Existing cars have come a long way since Henry Ford. On the other hand the past decade has seen an explosion in ULVs (unsuitably large vehicles) sold to consumers of a “super size me” culture. Now I am all for the old Range Rover V8 doing 16 mpg through deep Kalahari sands where a Ford F250 got just 8 mpg. However for the grocery store run?

That might be acceptable in Arizona but on cramped narrow British roads with passing places in hedgerows or London's residential road width restrictors? Bigger normally means heavier and less aerodynamic so the term gas guzzler still applies. How is it that in 40 years fuel consumption has not really improved significantly? Part of the answer is heavier structures and crash worthiness regulations but that's often an excuse. Take the Fiat X 1/9 2 seater 1970s mid-engine sports car – it featured 50 mph impact bumpers and roll over protection for the US market – they even rammed one with an AMTRAK ! It passed but then the Feds reduced the regs and Fiat lost out. However that small car was tough (apart from on UK salt laden winter roads) yet still much lighter than today's machines: http://www.sportsvogn.no/x19reg/story.html

A few visionaries still exist. VW developed the 3L cars – 3 litres of fuel for 100 km of travel. They produced the shortened Polo and called it the Lupo 3L with magnesium and Aluminium panels. Audi developed the all aluminum A2 which many have cited as an influence on today's BMW i3. The 3L version of the A2 was designed to carry 4 German sized adults and their luggage from Munich to Turin over the Alps with minimal fuel cost and low emissions. It had a Cd of just 0.25 – the same as the original 2 seater Honda Insight hybrid and weighed just 855 kg.

This has been my everyday transport for some 190,000 miles over the past 12 years: http://www.greenconsumerguide.com/audi_a2_tdi.php Sadly the car was poorly marketed compared with the less efficient Toyota Prius and productionceased in 2005. But not before an H2 and electric variant were prototyped. In 2010 DBM Energy claimed their modified Audi A2 could travel 375 miles at 55mph on batteries alone.

http://www.plugincars.com/claiming-battery-breakthrough-electric-audi-drives-375-miles-55-mph-without-recharging-99966.html

Sadly the factory and prototype burnt down.

VW have moved on into the extremely expensive ECO car with their impressive XL1 – but it's no longer a Volks-Wagen (people's car) at £100k !

http://www.topgear.com/uk/photos/vw-xl-1-we-drive-the-future-2014-02-03

Others have compared the i3 to Tesla. A bit like comparing a 1 series with an Aston Martin.

This review will look at basic everyday practicality and make some suggestions for BMW's further i3 development.....

External Colour choices:

Not a lot of choice. Mostly greys, silvers and one for the Dutch : orange. I don't mind the

contrasting black panels. One dealer suggested the i8 Protonic Blue might become available next year.

The biggest downside if you want orange is the extra you have to pay to upgrade the interior. Someone should tell BMW to have a look at Irn Bru (Scottish Soda – orange, black &blue can work!). Not such an issue in USA.

Interior space:

Many reviewers have posted that the i3 has an airy feel – at least from the front seats. I would agree that the large sloping front windscreen and uncluttered dashboard appears to offer more light and the high seating position reduces any bathtub parallels by giving a more commanding view of the road ahead. However, whilst the i3 is around 15cm wider than the A2, in the rear it has almost 4cm less headroom, 20cm less foot room and just under 7cm less elbow room. The larger rear side windows help to mask the latter somewhat.

The white i3 BEV had a white LOFT interior – nice if you never drive in the real world. The white carpets soon became muddy grey brown! The REX had the standard interior which was very practical.

I like the futuristic flat screens that appear to hang in space over the dash.

Whatever your view on the construction material, the anti reflective properties of the dash work well with the black bonnet rather like a 1960s Rally car.

The driving position is very comfortable and has a good degree of adjustment. The seat height shift is a little awkward compared to rival cars where body weight has to be lifted on the steering wheel before raising.

The seat heating is a very worthwhile option for winter driving and means you can save energy on interior heating.

Side bolstering of the front seats is minimal. Had the car been designed with conventional rear doors and without forward tilt on these front seats, maybe BMW could have gone for a fixed back sportier option like a Recaro Pole Position (just 7kg!).

Load space:

One disadvantage of RWD with rear Motor placement is the much high than normal load area and reduced volume.

(litres seats up /litres seats down)

i3: 260 / 1100 litres

A2: 390/1085 / and approx 1400 litres with rear seats out

A3 Coupe: 365 / 1100 litres

A3 Sportback: 380 / 1220 litres

A1 Coupe: 270 / 920 litres

Quite a bit of space is taken up with American sized Soda Cup holders between the seats!

Weight Saving:

BMW has made much about the lightness of the underlying CRP structure on the i3. They are to be congratulated for bringing this to a sub £26k (base model with £5k UK grant) production car.But it is still a heavy car even making allowances for the EV battery pack.

One wonders whether 19 or 20” wheels are more about style over substance – certainly a larger diameter spinning mass has a greater effect on vehicle dynamics. It would be interesting to know what each wheel design/tyre combo weighs.

Areas where lightness could be added:

1. Make it a 3 door or go for conventional rear doors with CFRP B pillar.

2. Go for 1 front wiper blade with full sweep. Remove rear wiper mechanism and install

better rear tailgate with aero screen cleaning. (NB: the front wipers DO NOT sweep up to 90 degrees so there are a couple of unswept patches either side at eye level).

3. Make rear seats removable like briefcase design in A2 and front seats fixed back like Audi TT Quattro Mk1.

5 Doors or 3 door with Access panels?

In terms of accessibility we have already seen reviews of the difficulty in releasing rear occupants with driver or front passenger in place. The suicide rear doors are a design statement more than a practical solution to rear seat entry/egress. Such an arrangement in a UK Supermarket parking space with an SUV either side, it could get too tight to let the kids out of the rear seats. In some ways a 3 door hatchback or Coupe might have an advantage, although those front doors tend to be longer. It seems odd that the designers made the front seats forward tilting and indicates that a 3 door option may have been in mind.

Some commentators have made comparison with the Mazda RX8. In both cases these sucide doors have had to be strengthened considerably and fitted with larger closing mechanisms and hinges to cope. From a weight and energy saving perspective this is a little absurd. Matters are made worse if a child seat is fitted in front without ISOFIX. Note the weight limit is just 18kg (40lbs) for an ISOFIX attachment so heavier children will require the seat belt attachment. This makes it impossible to open the rear door on the pax side if the child seat is up front.The deeper rear windows are good for rear seat occupants but do not open – not even to a vent position. Again why bother with rear doors? Make it a 3 door Coupe like the orange prototype or offer a CFP B pillar / Avant version with normal rear doors and hidden handles ( a la Alfa Romeo 156).

Aerodynamics - What a Drag!

The i3 has a closed front grill / kidney emblem and commendably flat under tray free of the usual incursions. But for an ECO minded car it is somewhat surprising that BMW did not strive to improve the Drag Coefficient or reduce the frontal area of the i3.

If you never go over 40 mph (London UK inside the M25) this isn't going to affect you. But most London workers live outside due to ever spiralling house prices and will likely need to use the Motorway (Freeway) network. Greater aerodynamic efficiency (and hence lower battery consumption) could have been achieved by replacing the BMW X5 like wing mirrors with VW XL1 rear view cameras or at least more compact examples. The Cd is 0.3 (about as bad as a 1992 Toyota Camry or 1993 Subaru Impreza). The i3 is much wider than most pure 4 seaters and the MPV styling and battery floor makes it quite tall. Frontal Area of 2.38 m2 x 0.3 results in a CdA of 0.714.

Compare this to a 2001 Audi A2 1.2 TDI : CdA 0.544 or 2013 VW XL1: CdA 0.279.

At 100km/h (62mph) the i3 BEV creates 326 Newtons of drag. The REX model a little more at 336 Newtons. The A2 a mere 257 Newtons.

More meaningful to the average punter is BHP absorbed by drag. Here we are not considering the drag from the drive-train / single gear or tyre friction and this is for a flat road with nil wind.

At 40 mph the i3 consumes a minimum of 3.33 BHP (2.5kW) in drag alone. Not a lot! But accelerate to 60 mph and it goes up a factor of 4 to 12.5BHP (9.317kW). Get on the freeway in Montana or de-restricted Autobahn and at 93 mph the i3 requires 42.14 BHP (31.44 kW)!

It is no wonder that i3 test drivers have noticed a massive reduction in range when driving on faster roads. If you add in tyre resistance, wheel well turbulence, and a less than optimal gear ratio (optimised for acceleration rather than cruising then expect about 60 mile range from a BEV and a bit less all electric from the REX).

What if BMW had optimised just the Aero side?

40mph:

A2: 2.54 BHP(1.894kW),

XL1: 1.30 BHP(2.54kW)

60mph:

A2: 9.52 BHP (7.10kW)

XL1: 4.88 BHP (3.64kW)

93 mph:

A2: 32.1 BHP (24kW)

XL1: 16.5 BHP (12.28kW)

The i3 could be improved by careful modification of the front profile (which could include improvements to pedestrian safety), an extension or redesign of the tailgate and a longer rear spoiler, vortex generators at the rear (perhaps incorporating the trademark aerial) and more ducting air dam style under the car to improve wake and add almost drag free down-force. The door alignment and rear wheel arches could be improved to lessen drag.

Noise:

The i3 internal SPL is actually about 2dBA louder at 50 mph than the diesel Audi A2 due to wind noise. But at lower speeds the ICE can't compete (except with Start Stop at the lights!).

Driver Technology:

The BMW i brand is all about connectivity and city mobility. This test drive did not spend much time in the City. It is not possible to test the iphone/Android app without making a purchase as it is linked to the vehicle's VIN number. I was able to link my phone via Blue Tooth and play music through the radio functions. This worked 90% of the time. Both cars had standard audio which is of reasonable quality. The other 10% there was electronic signal distortion.

The layered menus were not as intuitive as a touch screen app. The iDrive handwriting recognition didn't work for me as a Right handed scribe in a RH Drive car ! My other cars are LHD!

The start up procedure could be simplified. It's not a get away car! Unlike the A2 that tells you to put your for on the brake pedal before start, the i3 makes that assumption. The electronic handbrake took some getting used to but when trusted it seemed to work OK even on hill starts. NB the CFRP Alfa Romeo 4C has a traditional handbrake and is the lightest car in it's class.

Unlike other EV manufacturers the battery regen mode is all about the accelerator pedal. The sweet spot for freewheeling downhill is hard to find with the small text on the Tacho indicating minimal kWh/100km use. This could be corrected with a Head Up Display or peripheral coloured lights to aid the driver to drive more efficiently. Similar displays tell pilots about optimum wing angle of attack in flight.

The white i3 BEV had all the goodies in terms of rear view camera and automatic parking. This worked well 4 times out of 5. The 5^th was the same spot as the 4^th but for whatever reason the car refused to park itself once it found the spot. One issue is the position of the camera which is right on the rear bumper (fender) where it gets covered in road muck. A better spot might be behind the rear glass within the wiper's swept zone.

The large centre screen was a delight if a little distracting on the move. It is especially good in the rear view camera mode (with a clean camera!). But you must still scan between screen and real world to avoid pedestrians who can't hear the i3!

There is no SOC on the BEV which is a shame. The REX has it hidden away on a “hold state of charge” menu.

The vehicle pre-conditioning menu takes some finding but worked on both BEV and REX. It's important to realise the extra electricity you will use to get the car up to temperature in winter. I set 16 deg C for an 0715z departure time on both cars. The mistake with the BEV came when I tried to charge at work using a 13A socket. The car did not charge because the menu had a timer setting (for cheaper home night tariffs). In the end I managed to cancel that and got just an hour's worth of charge.

Breakdown cover:

The i3 has no jack, no spare wheel, no wheel brace. Back in 2003 I learnt the hard way that tyre gunk doesn't work as advertised. In fact I had bought a full set of winter wheels and tyres for the A2 but had left these at home on the daily commute. One of the skinny Bridgestone B381 Eco tyres gave up the ghost at 60 mph. There was no drama and no wheel damage but it was a busy road . Had I had a spare I could have used the underfloor tool kit and Alloy jack to get back on the road within 20 minutes. Instead it took over 4 hours to get a recovery truck out and go home to change wheels.

The i3 cannot be towed in the conventional fashion and must be lifted onto a low loader! I would rather carry a spare. But 19 or 20” in that small boot (trunk)?!

In Germany a full set of Winter 19” rims can be had for 900 Euros. In the UK BMW are charging almost double! LED lights: The BEV had the optional LED headlamps for normal (dipped) use. This gave a pleasant blue / white light. The adaptability was not noticed on country lanes. Main beam was still halogen and no better than other vehicles. The mix of blue and yellow light is a little odd.

How does it drive?

Short answer: Very well!

In fact it is great fun to drive and the novelty of silent startup and acceleration to 40+ mph is superbly smooth. The downside of fun is the temptation to use the available torque. Only once did my free hand reach for a non existent gear stick! Yes I would have liked a second cog for more efficient highway motoring.

The bar graph (approx SOC indicator) goes down like fuel gauge in an English Electic Lightning!

http://www.youtube.com/watch?v=g5dvT-G7JNs

For a newcomer to EVs it feels very odd to start moving in near silence. This requires even greater lookout and anticipation than normal in built up areas as pedestrians do not hear you coming. That is a positive aspect that should re-energise driver skills.

The acceleration is excellent – the REX was not noticeably more sluggish than the BEV. I spent most of the time in ECO PRO mode (with a maximum of 70 mph set for motorways). ECO PRO + was used to get from work to the dealer in Lincoln with a depleted battery. The car felt much more fidgety on the twisty B roads than in Comfort or EP. Perhaps the stability electronics and throttle/extra regenerative braking response has this effect.

Visibility from the driver's seat was better than expected and very similar to the A2. The driver just has to move their head around the thick A pillars when approaching junctions. The grip from the 155 front and 175 rear standard tyres is more than adequate for dry road cornering at speed. The rear tyres did struggle when there was a little mud on the tarmac and the traction control flashed on these occasions. Winter tyres offer a good 3 times the grip and much shorter stopping distances so it would be interesting to compare in winter conditions.

I was surprised that the BEV had 175 section rears and this may have added drag to match the REX. Apparently the REX has a slightly narrower rear track. Steering feel was good even if not direct (servo assisted). Narrow tyres bring steering benefits and

the turning circle impressed all who witnessed it. The cruise control was very good. Neither car had the lane keeping/auto braking technology.

Conclusions:

First off BMW deserves credit for bringing the i3 to market. It offers an alternative approach to EV design and manufacture. The blue sky thinking maybe went a little overboard in the style over substance department.

However, the looks grew on me. Even the cheap looking interior panels! The car drove far better than a car of this mass deserves. In practical terms it is not as good as it could be. BMW could learn a lot more from a similarly sized car built with practicality, ECO credentials, lightness and aerodynamic efficiency that is 15 years older. The aluminium Audi A2 (especially the 1.2 model). One thing they did far better than Audi was in marketing the i3 more aggressively like Toyota did with the Prius.

Improvments: If I were responsible for product development on the i3, for 2015 I'd introduce tat least some of the following:

1. Three door version like Coupe concept

2. Aero optimisation

3. Further weight reduction programme.

4. HUD option with SOC indication

5. More obvious ECO / Freewheel indication

6. More colour choice not linked to interiors

7. Lightweight Biodiesel or CNG REX options

8. More practical 5 door version with B pillar, removable rear seats and FWD to improve rear load space and traction in snow.

9. Better seat raising design.

10. Full LED lighting

11. RH iDrive for RHD and LH iDrive for LHD markets

12. Fairer winter wheel/tyre pricing

13. Better rear camera positioning

14. ICE FWD option without EV for long distance commuters in countries without decent electrical network.

15. Spare wheel/ jack options as alternative to tyre gunk.

16. Better Driver info menus

17. Better English translation of manual

18. Work with Solar PV controller manufacturers to offer old i3 batteries as storage and the likes of “Immersun” to offer Solar PV charging.

19. Encourage Fast DC network expansion in all markets – like FastNED.

Special thanks to Lucas for the in depth review!

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The First Volt Owner in Georgia Explains What He Doesn't Like About the BMW i3... and Why He's Buying One!

Chris Campbell with his Volt. Chris was actually the first Volt owner in the State of Georgia. Now that his 3 year lease is coming to an end he's chosen to replace his Volt with a BMW i3.

Chris Campbell has been following my blogs for a while now, and has commented on many posts. He's an avid electric car supporter and is a member of the BMW i3 Facebook group. Chris has been following the BMW i3 for a while now and he's been really anxious to test drive one. As you'll read below, the driving experience is really important to him - as it is for me. Chris finally has his chance to test drive the i3 (twice actually) and shortly after declared on a post in the Facebook group "I did test drive #2 this morning. That's it, I'm in.". I know Chris knows a lot about EV's, and I know he had his doubts about whether the i3 would be the right EV for him, after all he really loves his Volt. So when I read his declaration, I asked him if he would like to do a guest post here, to offer his story of  how he came to the conclusion the i3 would be the EV that would replace his Volt. He accepted the invitation, and sent me the post below:

GETTING OVER IT AND CHOOSING THE BMW I3

I am an electric vehicle enthusiast.  The wave of EVs in the late 1990s piqued my interested, but it was a lucky chance at a long test drive of a Tesla Roadster in April 2009 that gave me the EV religion.  By 2010 I was ready for a new car and the market was finally ready to give me an EV.  In my case the Chevy Volt was good choice because I have a short commute, well within the electric range of the Volt, but also wanted the ability to take the car anywhere at any time and not have to worry about range.  Note that there was virtually ZERO public charging infrastructure in 2010 when I got the Volt.

Fast forward three years and I'm now at the end of my three year Volt lease, and looking for my next car. The Volt has been great, and in fact I still believe it is the BEST car on the market, especially for anyone new to EVs.  After three years of tweaks, and this year's dramatic price drop, the Volt is even more compelling than when I took my somewhat risky plunge in 2010.  But, for me personally, as my Volt lease ends I'm now looking to move on to the next thing.

I've been following BMW's EV developments closely for a few years now, and after a second test drive this past Friday, I've decided that the BMW i3 is going to be my next car.  I'll explain why, but I'm also going to take a sober look at the car, probably unlike any other i3 review you've seen.

EVs are an absolute thrill to drive, and there was no doubt that my next car would be another EV.  While the environmental and geopolitical reasons for getting an EV are important to me, what really draws me is the sheer power (well, torque) of the electric drivetrain.  Once you experience that "stealth V8" power you just can't live without it.

So, for me, the very top issue in selecting the next car was POWER. How fast was it?  The Volt (and Leaf, even) are deceptively powerful, and a blast to drive, but I consider them to have only the MINIMUM required power.  More is better!  And early reports on the BMW i3 indicated that it was going to be more powerful than anything on the market short of the (sadly unattainable) Tesla models, so I've been following it very closely for over a year now.

There are lots of features that I like about the i3.  The carbon fiber structure is certainly cool.  I'm tall, and the long coupe-style front doors place the pseudo B-pillars (and seatbelt anchors) nicely back and out of my peripheral vision.  The i3 will have an available DC fast charging option, and I decided earlier this year that my next car simply had to have DCFC capability.  The drive train is well engineered, following four years of careful testing in BMW's MINI-E and ActiveE programs.  It's a BMW, so you're going to get a driver's car.

All these things are great, but certainly the car isn't perfect.  No car is perfect.  And in fact, that's how it usually works, right?  You fall in love with a car, then you find out something about the car that you DON'T like, and then you have to decide whether you can get over it.  Do the pros outweigh the cons?

The Nissan Leaf is ugly, has a spartan interior, and has a cheaper battery technology that makes it susceptible to weather extremes.  The Chevy Volt is a bit pricey and can't seat more than two people in the back (and the EV purists turn their noses up at it).  The Ford models have that hulking battery pack messing up the trunk, signifying the worst of "conversion car" engineering.  And so forth -- you can always find something wrong with a car.  Even the vaunted Tesla Model S has problems, most prominently its stratospheric price tag, but upon closer examination there are plenty of other problems.

So, I've got problems with the BMW i3.  Can I get over it?

I'm an engineer, and I can't help but try to analyze this decision soberly and methodically.  Anticipating that I'd be back in the market for a new EV after the Volt lease, a year ago I started assembling my checklist for the perfect electric vehicle.  This long document is a collection of every feature in every EV on the market, and serves as a way to honestly evaluate the cars on the market.  No car is perfect, not even the Tesla Model S, and my list serves to remind me that there are tradeoffs in any car.

With that, I will now itemize the top things that I do NOT like about the BMW i3.  See, I told you this would be unlike any review you'd read!  Again, I've said above that I AM going to buy an i3, in fact I will be happy to be the first in my home state, as I was with the Chevy Volt three years ago, and probably will be as big a cheerleader as anyone about the car (well, except for Tom M...).  But I'm doing this with a clear-eyed view of the pros AND the cons of the car.

In essence, this is a list of the things that I had to "get over" in order to commit to the i3.

IT'S UGLY!

While the i3 has some sexy angles, it has some real stinkers too. Look at it straight on from the front, or straight at the rear.  In both of those angles the weird design is jarring, and the skinny tires jump out at you.  I know, I know, 19-20 inch tires, contact patch size blah blah blah -- it just LOOKS bad.  But it's a thrill to drive!  So I'll get over the looks, or least tolerate the snide remarks.  At least I shouldn't have to worry about those kinds of comments from Nissan Leaf owners, right?  That has got to be the ugliest car on the market, from ALL angles!  Ha!

NO CLIMATE PRESTART ON KEYFOB

You're not going to believe this, but this feature is THE most important feature to me in an EV, putting aside the headline features of the drivetrain, battery and charging technology.  The same way you get addicted to the instantaneous torque of an EV drivetrain, I have become addicted to that little button ON THE KEYFOB of my Chevy Volt that starts up the climate control.  I use it every ... single ... time ... I get into my car (so at least twice daily), from inside the house as I'm getting ready to leave in the morning, and then on the way home as I'm approaching the car at my workplace.  Yeah yeah, sure, I can use the smartphone app -- wanna race?  It takes me 3 seconds (and minimal cognitive engagement) to get the car warming up, and I can do it blind with the keyfob in my pocket.  Try THAT with your smartphone.  Scheduling the prestart doesn't solve this for me because I don't get in the car at the same time every day.

There is a "diamond" button on the i3 keyfob that acts as a panic button, but I've heard a rumor that it is actually *configurable*, and that climate prestart may be one of the configurable options.  If so, congratulations BMW on a brilliant solution, and scratch this off the cons list!  But I haven't seen confirmation, so it remains on my short list of problems with the i3.  Trust me, once you have this feature, you can't live without it.

CHARGE PORT ON WRONG SIDE OF CAR


You will plug and unplug the car EVERY DAY.  That's at least two trips to the charge port location, and therefore it should be as close as possible to the driver's door.  BMW stuck it in the right rear corner, just about the worst possible place.  I'm sure they have their reasons, but from a usability perspective it's just all wrong.  I have seen some factory photos of the CFRP passenger cell that have shown that the interior structure of the car has cutouts on BOTH sides, so it's possible that they may relocate the port to the rear left side in the future, but for now -- it's in the wrong spot and will annoy me twice a day for my entire life with the car.

NO POWER SEATS
Power seats aren't even available as an option.  It takes me forever to get the seat adjusted just right, and thus I really want the memory function of the power seats so I can put it back the way I like it after someone else has driven the car (spouse, mechanic, etc.).  A car that approaches $50,000 when loaded with options should offer power seats as one of those options.  And don't try to tell me that it's left out for energy saving reasons, that's simply nonsense.  I'll buy the weight savings argument, but still, this should be an option.
 
WHAT'S NOT ON THIS LIST

There are many things that other people have complained about that are NOT a problem for me:

- It's a four seater.  You can't put three people in the back seat, even three kids, as there's a console in the middle and no third set of seatbelts.  That's fine with me.


- There is no SOC percentage showing the exact state of the battery charge.  I know the other i3 fans are screaming about this, but I could not care less.  I'll trust the indication of mileage remaining, and will eventually learn how to correct for challenging driving ahead.

- Range: 80-100 is plenty for me.  In fact, using the VoltStats.net data from my last three years of Volt driving, I recently found that 80-100 is perfect for me.  Give me the DCFC interface and even just a hint of a future charging network and I've got all I need.

I GOT OVER IT

And here we are.  I've listed some big problems I have with the i3, and I've listed even more on the full EV checklist on www.ElectrifyAtlanta.com (now updated with i3 data).  And yet ... the drive is intoxicating.  It's got more power (more more more gimme) and can carve through turns like it's on rails.  Check out Chris Neff's recent report on his day with an i3 as a professional race car driver flung it around a racetrack for 10 hours!

It's got good range.  It has a sunroof option, and I love the doors. It offers HD Radio and RDS, which are radio tuner features that I really wish all cars had. I even love the underdog factor of having the SAE Combo DC fast charging interface that all the Nissan and Tesla partisans are howling at.  Game on, let's go.

And so I got over it.  Take my money, BMW, the sooner the better.  Can I be first in Georgia again?

Chris Campbell
www.ElectrifyAtlanta.com

The only question I now have for Chris is what color does he want. Will he choose Laurel Gray like I plan to order?

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