Originally Posted by Joe@ApexRaceParts
On the front with an 18x9" ET31 we recommend a 245/40/18.
Since your car is non-lci it is possible to run an 18x9.5" ET22 depending on tire size; we recommend a 265/35/18. You will need to roll your rear fenders. It will be easier to run a less aggressively sized street tire like a Michelin Pilot Super Sport. If you decide to go with an extreme performance summer tire like the Hankook RS3 than more fender rolling may be needed.
That seems like it would be too tall. Wouldn't a 245/35-18 be a better choice for non-m? Would a 245/35/18 on your 18x9" fit the front of the non-m w/o rubbing or spacers?
2007 E90 335i, TiAg, 6AT, ZPP, ZSP, ZCW, 6FL, HD
Quaife lsd, ETS fmic, GIAC s/w, Dinan intake/exhaust/oc, KW/M3 susp, Apex Arc 8, Mich PSS