Biggest sizes that fit or biggest sizes that fit AND provide good performance? Your performance gain is diminished if you install a tire that's too wide for the rim.
I wouldn't go wider than 275 mm on the 9.5" rear wheel and 255mm on the 8.5" front wheel. There are people who have gone wider but I don't recommend it. Some autocross rules limit wheel sizing so I have seen some auto-crossers run very wide tires on OEM wheels.
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'23 X7
'04 M3 - Fall Line Motorsports Built Race Car - S65 swap, Dry Sump, Bosch Stand-Alone ECU, Drenth Sequential Trans, MCS 3-Way, Flossmann Wide Body, Brembo Motorsports Brakes, Drexler LSD, BBS E88 Etc.
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Last edited by slicer; 04-16-2014 at 05:37 PM..
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