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Re: wheel/tire fitments on 99 M3 coupe (archive)

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Posted by DCC on April 26, 2000 at 20:42:52:

In Reply to: wheel/tire fitments on 99 M3 coupe posted by bill boom on April 26, 2000 at 18:38:51:

17x8 is a popular size for track wheels
R compound tires are generally cast larger than their street counterparts for any given size
So your 235/40/17 Ao32R from Yokohama would be as wide as a 245 Pilot Sports
If you choose the factory 17x8.5 wheel (41mm offset) for both front and rear fitment, you might be able to get it to work with 235/40/17 R compound tires and still be able to rotate


: I'm planning on buying some new wheels and tires for track use on my 99 M3 coupe, and I have some questions re. fit:

: 1) It would be nice to go with the same size all around (so that I can rotate them all) - given that, my research pretty much points to 235/40 tires as the largest that will fit (front and back) w/out fender rolling or spacers, assuming I go with 17x8 wheels. Does this sound right, and does the fact that my car is lowered by 3/4" or so by Eibach Pro-kit springs affect the fitment? I haven't got a definitive answer on this from the shops I've called so far, so I'm wondering if any of you have empirical data.

: 2) Since the stock tires I've been running with are 245/40 in the back, will going to 235's back there cause any noticeable/significant traction loss? (Btw, I'm planning to go with an R-compund tire, so maybe the decreased track width will be offset by the extra stickiness of the new tires over the Michelin Pilot Sports.)

: 3) If I decide to stay with different sizes on the front than on the back, and stick with 245's in the back, will it be OK to go with a 17x8 rim (as opposed to the stock 17x8.5), or should I stick with a 17x8.5 wheel back there? I know that there are issues with having a tire that's too wide for the rim it's mounted on. Having to get a 17x8.5 would affect what brands of wheels I can go with, e.g. BBS rc does not apparently come in a 17x8.5.

: 4) Again, if I stay with with bigger rear tires - will 255/40's fit? I've heard they will, but again I'm not sure if the lowered state of the car affects it. If 245's are OK on an 8" rim, will 255's be as well, or would I then definitely be pushing the envelope?

: Thanks!

: - Bill

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