8 inches commonly. 35 offset would be best, but it may not fit on stock suspension. rubbing you will need a spacer. no more than 3 or 5mm though. usually 7 inches is wide enough. there are a few on here with 9 and 10 inch wheels, but they are 20mm offset or lower, and have widebody fenders. they use 275 tires and run Redline time attack. i wouldnt go any wider than an 8
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