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      03-31-2008, 04:12 PM   #1
runnerx
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///M roady 235/265 on stock rim

Hi all,

I need some new rubbers and would like wider tires.. I am currently thinking about 235/40-18 (front) and 265/40-18 (rear) on stock rims. any fitment problems? suggestions are welcomed.

Thanks..
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      03-31-2008, 04:23 PM   #2
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Why go with 40's instead of the stock 35's in the rear. That'll add about an inch of diameter. While I suspect that it will fit, your acceleration will suffer by about 4%.

>> Oops. I'm wrong. See below.

Last edited by vachss; 03-31-2008 at 05:05 PM..
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      03-31-2008, 04:28 PM   #3
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Quote:
Originally Posted by vachss View Post
Why go with 40's instead of the stock 35's in the rear. That'll add about an inch of diameter. While I suspect that it will fit, your acceleration will suffer by about 4%.

225/45/18(front) and 255/40/18(rear) are stock on the M roady.
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      03-31-2008, 04:44 PM   #4
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Quote:
Originally Posted by runnerx View Post
225/45/18(front) and 255/40/18(rear) are stock on the M roady.
OK, thanks for teaching me something. It never occurred to me that BMW would put more aggressive (lower aspect ratio) tires on the non-M, but I guess that's what they do. I guess this compensates somewhat for the higher rear end gearing of the M (3.62 vs. 3.46-3.23 for the non-M).

PS. Given that I wouldn't think the OP would have any trouble fitting the slightly wider tires he's considering.
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      03-31-2008, 04:45 PM   #5
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i was thinking of running the same setup. Im pretty positive they will fit the stock wheels. Not sure about the 40 offset all around. We need more tire gurus out here
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      04-01-2008, 10:22 AM   #6
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any tire guru here?
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      04-01-2008, 11:57 AM   #7
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Quote:
Originally Posted by runnerx View Post
any tire guru here?
I made a thread a week ago about this topic and i got no responses I dont think there too many here. Im going to call tire rack and see what there opinion is. You can go ahead and call if you want. Ill post up here what the result is.
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      04-01-2008, 12:13 PM   #8
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Quote:
Originally Posted by MMMazing07 View Post
I made a thread a week ago about this topic and i got no responses I dont think there too many here. Im going to call tire rack and see what there opinion is. You can go ahead and call if you want. Ill post up here what the result is.
I emailed Gary@tirerack yesterday, he also is the moderator of E90post Tire and Wheel section. Hopefully, he can shed some light on this for us.
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      04-01-2008, 01:23 PM   #9
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Quote:
Originally Posted by runnerx View Post
Hi all,

I need some new rubbers and would like wider tires.. I am currently thinking about 235/40-18 (front) and 265/40-18 (rear) on stock rims. any fitment problems? suggestions are welcomed.

Thanks..
Tires will fit on the rims.

Here's your bible. http://www.carbibles.com/tyre_bible.html
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      04-03-2008, 10:17 AM   #10
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thanks guys. I ordered Goodyear Eagle F1 Asymmetrics 235/40-18 and 265/40-18 for my stock rims. hopefully there won't be any rubbing. I will let you guys know later.
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      04-04-2008, 04:01 PM   #11
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Correct me if I'm wrong, but the diameter of that setup does not match stock, so the speedometer will be off by a few percent. Does this change the way DSC behaves?
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      04-04-2008, 10:53 PM   #12
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Quote:
Originally Posted by chris719 View Post
Correct me if I'm wrong, but the diameter of that setup does not match stock, so the speedometer will be off by a few percent. Does this change the way DSC behaves?
yes, at 60MPH, the front would be about 59ish and the rear would be 61mph.

the diameter change is still less than 3%, so it shouldn't cause any problem with DSC.
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Last edited by runnerx; 04-05-2008 at 11:15 AM..
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