F80 M3 - 20x9.5 up front. 20x10.5 in rear

[g540i]

Hello folks!

While searching for a new set of light sport 20" wheels for my M3 F80, I've come to a set with sizes 20x9.5 ET22 and 20x10.5 ET35. I've read numerous threads but haven't found a definite answer to my question.

Plenty of M3/M4 guys are running a 9.5/11 setup with 265/30 and 295/30 which is perfect for the 11, but I just don't like the stretched look of the fronts, and I would like some added layer of protection for the wheels. Furthermore, I'm not really sure would the 295 on a 10.5 rim be too bulky.

Also, the setup would be very close to the factory setup and tolerance, +1.9%, so there should be no problems regarding ECU intervention and higher speeds.

The question is can a 20x9.5 ET22 and 20x10.5 ET35 setup run a KW HAS drop, 275/30/20, and 295/30/20 Michelin PS4S without rubbing or major problems?

Any thoughts? Thanks in advance!

[richlandforged]

g540i 275/30/20, 295/30/20 can in general be accomplished, however almost always will create some amount of rubbing on fender liners in the front, which depending on preferences and affinity for the liners should be considered. 265/30/20 is generally our recommendation on the f80 specifically (f82 a bit more freedom). One can massage fender liners with heat gun to massage to encourage less interference, or one can also consider the liners "sacrificial". The 275, 295 will have approximately the same "stretch" (or lack there of in this case), maybe a bit "fatter" in the rear, but proportionally fairly equal, and given goal of added protection, likely satisfies that need!

[Hxngs]

Not sure about 20’s but I run 18’s 275/35/18 tire with a 10mm spacer up front and a kw has kit. You would for sure need a 5mm to stop it from hitting the shock/sleeve.

[g540i]

Originally Posted by richlandforged

g540i 275/30/20, 295/30/20 can in general be accomplished, however almost always will create some amount of rubbing on fender liners in the front, which depending on preferences and affinity for the liners should be considered. 265/30/20 is generally our recommendation on the f80 specifically (f82 a bit more freedom). One can massage fender liners with heat gun to massage to encourage less interference, or one can also consider the liners "sacrificial". The 275, 295 will have approximately the same "stretch" (or lack there of in this case), maybe a bit "fatter" in the rear, but proportionally fairly equal, and given goal of added protection, likely satisfies that need!

Thanks for the info! I'm really not a fan of the stretch with the 265/285 of this setup. I was rethinking the tire choice, as the PS4S does run bulky. Maybe going the Pilot Super Sport route would be a compromise to have some more protection and less stretch than the 265. Massaging the front fender liners with a heat gun should not be a problem if there isn't too much of it.

Originally Posted by Hxngs

Not sure about 20’s but I run 18’s 275/35/18 tire with a 10mm spacer up front and a kw has kit. You would for sure need a 5mm to stop it from hitting the shock/sleeve.

Thanks! What ET are you having upfront? Is the wheel or the tire hitting the shock?

[Hxngs]

Originally Posted by g540i

Thanks! What ET are you having upfront? Is the wheel or the tire hitting the shock?

18x9.5 et22. The kw has kit is known to interfere with fitment. It’s the tire that hits.