gugotim wrote Thanks for reply.
My requirement are not to use spacers bacause of security and vibrating concern, no fender rolling or something like that.
And I want a setup both for street and track, because when I get kw v4 cs, I want to use the same suspension steup, at least same camber setting to avoid adjusting after track use and back on street.
275 on 9.5+22 is ok，but I see on Apex fitment guide, 295 on 10.5+22 may need fender rolling, which I try to avoid.
High-quality spacers are not an issue. F82 GT4 factory-built racecars use a 30 mm spacer on the front and the f87 M2 CSR factory-built racecars use 41 mm thick spacers. The spacers are used on the front so 11et30 and 10.5et46 square setups can be used on the GT4 and CSR, respectively.
Additionally, a very large group of people who track their f8x use 15-20 mm thick spacers to be able run a square wheel (10.5et36) and tire setup (295).
You check if spacers sit flush by trying to slide a single sheet of paper between the spacer and wheel & rotor mounting surfaces. Doesn’t slide in = flush spacer.
The front fenders on the e9x M are made of plastic so not easily to fender roll. You’d need to heat the fenders as you try to roll them. I wouldn’t try this!
For the e9x M, 18x10et25 square works with a 5 mm front spacer and no rear spacer (but you could run a 5-10 mm spacer). 285 square tires would be used. Front camber of -3.0 deg to -3.5 deg
Yes, an18x9.5et22 square setup with square 275/35 tires fits with no spacers and is a fairly commonly used setup. I have both setups, as well as a 9.5et22 and 10et17 setup, and the extra 10 mm of tire width really helps with turn-in (plus zero toe or slight toe-out). -3.0 deg of camber should be sufficient but -3.5 deg may be required depending on tire type/brand.
