245/40/18 and 275/35/18 are NT01 working great for me at the track this weekend. Running a 12MM spacer up front to clear the shock with 4 degrees of camber (could likely get away with less spacer but didn't have anything hubcentric available smaller). Rear 275/35/18 are rubbing just slightly on the inner fender, a quick baseball bat roll job should solve this (It's literally just barely shaving the sidewall vertically).
Compare tire specs, I would be less concerned with the size, and more concerned with overall diameter and contact patch, these NT01s are very wide given their specs, and the traction shows.
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2004 Porsche GT3 |White
HRE R40 Monoblocks | KW Clubsport Suspension | RSS Lower Control Arms and Suspension Links | GT3RS Wing and Front Bumper | Cup Car Lip | Euro GT3 Seat | GMG Half Cage | Europipe Exhaust | EPL Tuning
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