Quote:
Originally Posted by Reach
Mostly for looks/style!
Even if the weight is the same in 18 vs 19 fitment, as you lower the distance from the cylinder wall to the hub you lower the rotational inertia of the wheel. The same power will spin the wheels faster.
M cars also come with those massive brakes, so usually 18"+ is required just for clearance issues.
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Very interesting observation, I had not thought of it like that. I had the same reaction as creator8 originally but this makes a lot of sense.
