In Reply to: Rotor Size and Thickness posted by Mark C. on July 26, 2000 at 09:28:28:
Anyone else notice that the front brake rotor diameters for the 330 and the M3 are the same? I've been hunting for the M3's brake diameters for a while now, for winter wheel issues, and i found that the fronts are 12.8" and the rear is 12.9". Then, i decided to check the 330's sizes because of BMW claiming they had to use 17" wheels as standard now, because of it's increased brake sizes. So, i discovered that the front brakes on the 330 are 326mm. I got my trusty calculator out, and discovered that that works out to 12.8"!!! Now, i would think that BMW would improve it's brakes for their premier 3-series, but now it appears that the //M has the same damn part! Anyone with some knowledge on this, please help me out here.
In addition to rotor thickness and caliper differences between the M3 and normal 3 series, the rotors are unidirectional (at least they are on the E36) for better cooling. And of course, in Europe they get the floating rotors.
The similarities are only skin deep ;-)