The fitment will be the same on all 928's, until the GTS and they can go a bit wider on the rear with the flared fender. You can run a 275 on the rear and 255 on the front no problem. The problem is it offset's at maximum fitment. No other model rims will really works well on the front. The boxster comes close. If you go below a 55mm offset on the front it will start to stick out of the body work like the pic above. It looks like 153 is using a 911 set up. My car is lowered so on bumps and turns there would be fender to tire contact. The pic is 245/35/19 and 275/30/19 The offset up front wheel is 19x 8.5 et 55 and think the rear is19x 10et45
