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      06-06-2008, 01:19 AM   #1
GFP
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Calling E92 tire guru's...quick question.

Is running 245 35 19 on 8.5 rims front and 275 30 19 on 9.5 rims for the rears going to be an issue on the E92? Or is a 265 35 19 on 9.5 rims for the rears a better symmetrical setup? I want a wider than OEM setup in the back but Im worried about having a 30 size wall back there looking terrible with 35 walls for the fronts? Kinda clueless about these things...please help...
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      06-06-2008, 06:22 AM   #2
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The difference between a 265 and 275 rear really isn't that much.....but a 275 is about the widest tire you can run on a 9.5" rim without stretching it too much....

Dinan offers a custom wheelset thats 9.5" front and 10.0" rear with 275 front and 295 rear...all that extra tire should improve handling quite a bit!
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      06-06-2008, 10:48 AM   #3
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One point. A 10mm difference is marginal, but the more you increase the stagger between the front an rear diameters, you are inducing a bit more understeer to the handling balance at the limit.
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      06-06-2008, 11:33 AM   #4
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On the M3, the rear tire should be slightly taller than the front, so do not use 275/30R19 with a 245/35R19. Ideally you would go 255/35R19 front with 275/35R19 if you wanted to go wider.

275/35 rear with 245/35 front would *probably* be ok, but the understeer would increase, as noted above. The change in width is what changes the handling balance.
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      06-06-2008, 12:01 PM   #5
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From experience I would not go wider than recommended for the rim. As everyone has said the handling will be affected but what they haven't said is that your tramlining and steering input will also increase, your car will wonder more so over the road and will require more steering input to arrow straight which is a bigger problem as your speed increases.

I remember a customer's car (328ci) with factory fit 17" that was running 225 at the front, in the end the dealer decided to swap these for 205 or 215 at the front and the difference was remarkable.

You should never over tyre a rim.
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      06-10-2008, 12:20 AM   #6
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Quote:
Originally Posted by icemang17 View Post
The difference between a 265 and 275 rear really isn't that much.....but a 275 is about the widest tire you can run on a 9.5" rim without stretching it too much....
stretching a tire means you are placing tire thats narrower than recommended on the particular wheel width, not the other way around.
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      06-10-2008, 12:41 AM   #7
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Quote:
Originally Posted by malter2.0 View Post
stretching a tire means you are placing tire thats narrower than recommended on the particular wheel width, not the other way around.
Correct. On camber limited cars like the e92 this is much less of an issue in the front than pinching a tire.

A 275 will work fine in the rear. By increasing the rear grip the car will put down power better but understeer more. Faster, but perhaps not as much fun.
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