Originally Posted by M3PO
I'm with you. Just to clarify, these were 18x10.5 +25 with 275 RS3s in both cases. He was running KW CS (dunno the status of the helper spring) with a modest drop and I was running KW Sleeve kit all the way down. That was the only difference. The wheel itself was hitting the collar on my car. No clearance issues for him.
My 18 x 9.5 et22 front wheels with Michelin PSS have 2-3mm of clearance to the spring. I also had a slight rubber mark on my springs when I removed my wheels. He must have either removed his helper springs or ran stock ride-height in order to make this work. Another possible explanation is that the tires are more stretched on the 10 and 10.5" wheels and that could provide more clearance.
'13 SSII M3 Coupe - KW Clubsport 3-way, Akrapovic Evolution, ESS Tune, StopTech Trophy, IND Euro Front Bumper and Gloss Black Mirror Covers, TMS Studs/Lugs, BMW Performance Carbon Fiber Spoiler/Interior Trim/Center Console, BMW Edition Grills/Gills, BMWPedals Extended DCT Paddles, Advan TC3 18x9.5 & 18x10.5 - Hankook RS3 (Track), HRE R40 - 18x10 & 18x11 - Michelin PSS (Street)