Quote:
Originally Posted by swamp2
Factory clearances are very generous. Mostly (even with a sports car) the purpose is to account for snow, mud, debris etc. You can push an OEM M3 wheel 15-20 mm to the outside and still have plenty of clearance. I think I have heard that 15 rear and 20 front on the M3 still produces NO rubbing, lowered or not. That may be about the max. Keep in mind if it will rub lowered it will rub unlowered, just when you hit a bump!
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Yes, I understand that the factory clearance is generous, but that's within the wheel arch area. If you stretch out your wheels to align with the outer body shell it's not quite so generous anymore! Someone did say that when a wheel is forced upwards the movement is not straight up vertical but cambers inward, so that would probably avoid contact.
I still don't quite get why the larger increase in the front, over that in the rear, appears to be preferred? I know what increasing track width does, apart from the aesthetics, but why not increase the rear the same as the front?