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      04-08-2007, 10:39 AM   #1
E36325is
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official tyre size?

Does any body know the offical F/F tyre dimensions for the E92 M3? Interested to know for 18/19.

360mm front brake disc is impressive but single piston caliper again? :mad:
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      04-08-2007, 10:55 AM   #2
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Ive read that they are 245/40 & 265/40 on 18". As you can see, the wider rears have the same aspect ratio as the fronts (40), making those taller overall. This situation is very common on Ferraris, Lamborghinis, etc, but new to BMW (which always had lower aspect ratios for the wider rears).

I do not know the tire sizes for 19". The Geneva concept had Michelin Pilot Cup tires from the E46 CSL in 235/35 & 265/30, but I guess that the production version of the E92 will have even wider tires (maybe 245/35 & 265/35).
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      04-08-2007, 11:04 AM   #3
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Quote:
Originally Posted by Martinmaxx View Post
Ive read that they are 245/40 & 265/40 on 18". As you can see, the wider rears have the same aspect ratio as the fronts (40), making those taller overall. This situation is very common on Ferraris, Lamborghinis, etc, but new to BMW (which always had lower aspect ratios for the wider rears).

I do not know the tire sizes for 19". The Geneva concept had Michelin Pilot Cup tires from the E46 CSL in 235/35 & 265/30, but I guess that the production version of the E92 will have even wider tires (maybe 245/35 & 265/35).
Yes, tire size for the 19" 220 M are 245/35 and 265/35
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      04-08-2007, 05:54 PM   #4
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Perhaps

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Originally Posted by remmib View Post
Yes, tire size for the 19" 220 M are 245/35 and 265/35
Only if the 19s for production are identical to the 19s shown on the concept car. I would say it is likely but not yet a sure thing.
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      04-08-2007, 06:27 PM   #5
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Tire sizes

Quote:
Originally Posted by E36325is View Post
Does any body know the offical F/F tyre dimensions for the E92 M3? Interested to know for 18/19.

360mm front brake disc is impressive but single piston caliper again? :mad:
Per the German price list, the stock wheels are 8.5/9.5 x 18 w/ 245/40 & 265/40 ZR tires. The optional 19s are same width but with 35-series tires, of course.
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      04-08-2007, 06:33 PM   #6
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On the (red) one, on which the official photos and videos were made, there are 245/40 18 on both front and back. But I'm sure it won't be like this on the production vehicles.
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      04-08-2007, 06:45 PM   #7
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On the (red) one, on which the official photos and videos were made, there are 245/40 18 on both front and back. But I'm sure it won't be like this on the production vehicles.
No, the rears on that car are definitely larger than the fronts. No way they they would showcase a square setup on the M3.
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      04-08-2007, 06:50 PM   #8
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^ I thought the same man, but look at the pictures. See for yourself.
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      04-08-2007, 10:41 PM   #9
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Quote:
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Only if the 19s for production are identical to the 19s shown on the concept car. I would say it is likely but not yet a sure thing.
Check out the 19 inch rims on the German website... only the old 19inch rims...
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      04-08-2007, 11:53 PM   #10
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Brakes

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360mm front brake disc is impressive but single piston caliper again? :mad:
Check out the brake discussion here, specifically on the number of pistons. 99.9% likely it will be twin piston front, single rears, (despite the error in the pdf spec sheet).
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      04-09-2007, 01:03 PM   #11
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Quote:
Originally Posted by Martinmaxx View Post
Ive read that they are 245/40 & 265/40 on 18". As you can see, the wider rears have the same aspect ratio as the fronts (40), making those taller overall. .....tires (maybe 245/35 & 265/35).
If this is true that it will have front 245/40 and rear 265/40 , the rear has larger diamater than front. It is interesting to see how DSC, DTC, etc works on tires with different rolling per minute.

It is better if they have 245/40 front and 265/35 rear or 275/35 rear.
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      04-09-2007, 01:15 PM   #12
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Quote:
Originally Posted by 2m3 View Post
If this is true that it will have front 245/40 and rear 265/40 , the rear has larger diamater than front. It is interesting to see how DSC, DTC, etc works on tires with different rolling per minute.

It is better if they have 245/40 front and 265/35 rear or 275/35 rear.
The reason for using taller tires in the rear is to be able to get a bigger tire contact patch, without the need to use even wider tires. It is not a bad thing to have! The Ferrari F430 has 225/35 fronts and 285/35 rears. Same aspect ratio for both axles, but with 60mm wider rears.

Regarding DTC, ABS, etc, they all work based on a signal from the wheel rotation sensors, which is then processed by the corresponding electronic module. By applying a correction algorithm, the information from the rear wheels can be easily adjusted by the BMW engineers.
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      04-09-2007, 02:21 PM   #13
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Quote:
Originally Posted by Martinmaxx View Post
The reason for using taller tires in the rear is to be able to get a bigger tire contact patch, without the need to use even wider tires. It is not a bad thing to have! The Ferrari F430 has 225/35 fronts and 285/35 rears. Same aspect ratio for both axles, but with 60mm wider rears.

Regarding DTC, ABS, etc, they all work based on a signal from the wheel rotation sensors, which is then processed by the corresponding electronic module. By applying a correction algorithm, the information from the rear wheels can be easily adjusted by the BMW engineers.
Thank you for your response. What do you mean by "using taller tires on the rear is to be able to get a bigger tire contact patch"? DO you mean the side wall will flex and compress?

I think 275/35 or more still fit under rear fender.

THis is the first M to have rear tire with taller diameter than the front.
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      04-09-2007, 02:38 PM   #14
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Quote:
Originally Posted by 2m3 View Post
Thank you for your response. What do you mean by "using taller tires on the rear is to be able to get a bigger tire contact patch"? DO you mean the side wall will flex and compress?

I think 275/35 or more still fit under rear fender.

THis is the first M to have rear tire with taller diameter than the front.
Since the overal diameter is bigger, the contact patch is also bigger (longitudinaly). The curvature of the taller wheel is flatter, and therefore, puts more rubber on the ground at once. That is why dragsters have not only wider but also taller wheels on the traction axle... (to maximize traction).

I believe this is the first BMW (not only M) to have taller rear wheels.

Porsche is also starting to use taller rear wheels now. Until the 996, they had almost identical diameters for front and rear wheels, but since the 997, they are using taller rears. For example the 997 has 235/40 18 up front and 265/40 18 on the rear, while the 993 had 225/40 18 and 265/35 18.
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      04-09-2007, 05:55 PM   #15
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Quote:
Originally Posted by Martinmaxx View Post
Since the overal diameter is bigger, the contact patch is also bigger (longitudinaly). The curvature of the taller wheel is flatter, and therefore, puts more rubber on the ground at once. That is why dragsters have not only wider but also taller wheels on the traction axle... (to maximize traction).

I believe this is the first BMW (not only M) to have taller rear wheels.

Porsche is also starting to use taller rear wheels now. Until the 996, they had almost identical diameters for front and rear wheels, but since the 997, they are using taller rears. For example the 997 has 235/40 18 up front and 265/40 18 on the rear, while the 993 had 225/40 18 and 265/35 18.
Thank you again Martinmaxx. This is something new to me, but glad that you opne up my eyes on this tires set up.

I notice NSX, G35, 350Z, IS350 all have taller diameter rear tire besides Ferrari, Lambo, etc.
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      04-09-2007, 05:59 PM   #16
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Quote:
Originally Posted by Martinmaxx View Post
Since the overal diameter is bigger, the contact patch is also bigger (longitudinaly). The curvature of the taller wheel is flatter, and therefore, puts more rubber on the ground at once. That is why dragsters have not only wider but also taller wheels on the traction axle... (to maximize traction)......and 265/35 18.
HI Martinmaxx,

Is there any benefit of having smaller diamater tire at front axle?
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      04-09-2007, 07:32 PM   #17
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HI Martinmaxx,

Is there any benefit of having smaller diamater tire at front axle?

Better steering feedback due to lower unsprung weight.
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      04-09-2007, 09:04 PM   #18
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18" or 19" which is better?

The videos of the red ///M3 going around country roads appears to have 18" wheels, not 19". While I feel 19" will give the M a better and more aggressive look, will it affect ride comfort even with the 40-aspect ratio tyre at the rear?
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      04-09-2007, 09:25 PM   #19
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Ride comfort with 19s

Quote:
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The videos of the red ///M3 going around country roads appears to have 18" wheels, not 19". While I feel 19" will give the M a better and more aggressive look, will it affect ride comfort even with the 40-aspect ratio tyre at the rear?
Certainly it would have a minor effect. However, I went from 18s to 19s on my E46 and barely noticed the difference. The 40-series tires will have about the same sidewall as 45s on the E46. Should be fine.
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      04-10-2007, 09:47 AM   #20
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Quote:
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Better steering feedback due to lower unsprung weight.
Thanks again
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      04-10-2007, 10:02 AM   #21
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Quote:
Originally Posted by MisterBMW View Post
The videos of the red ///M3 going around country roads appears to have 18" wheels, not 19". While I feel 19" will give the M a better and more aggressive look, will it affect ride comfort even with the 40-aspect ratio tyre at the rear?
I think 265 with 35 aspecct ratio (19inch) should affect the ride quality that much. My Box is using 265 40 18inch in the back and that's pretty cushy.
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      04-10-2007, 10:39 AM   #22
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Don't try this if you have an M3 in NYC..... The roads are rough...
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