Originally Posted by David@ApexRaceParts
The recommended ARC-8 fitment for an e90 LCI would be the 18x8.5" ET38 and 18x9" ET42 with 235/40/18 and 255/35/18 sized tires if you are not willing to roll the rear fenders. With rear fenders rolled, you can fit the 18x9.5" ET35 rear wheel with the same 255/35/18 sized tire...
The 18x9.5" ET35 with a 255/35/18 street tire is about as aggressive as the LCI can take in the rear without pulling the fenders or modifying the rear fenders with fender flares. The lower offset 18x9.5" ET22 has the same concave face as the 18x9.5" ET35 so there isn't anything to gain by going with a lower offset, more aggressive wheel unless you wanted the wheels to poke past the fenders.
Thanks for all that useful info. I'm going to get the rear fender rolled, so I'm considering ARC-8 with these specs: 18x8.5" et38 front, 18x9.5" et35 rear.
: With 235/40/18 up front and 255/35/18 in rear, the tire diameter difference is 1.472%. Is that under acceptable limit? 225/40/18 would be almost identical to rear in diameter, but do you not recommend that because it might be stretched up front? If I wanted to do PSS which measure ~ 10mm wider than most tires, would you still suggest 235/40/18 or would you recommend 225/40/18? I was thinking 8.5" et38 ARC-8 with 225/40 PSS and 9.5" et35 ARC-8 with 255/35 PSS would look noticeably wider and more aggressive than my stock. What do you think? And thanks AGAIN.
: Going from stock 8" to ARC-8 8.5" wheel up front gives "10mm LESS clearance on the strut side, and the outside edge of the wheel will EXTEND an extra 2mm". Since you recommend 8.5" up front I assume I have sufficient space on strut side to give up additional 10mm? Can you comment on that?