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Thats a easy one. Size is for weight of car and... (archive)

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Posted by Evan...(more) on July 25, 2000 at 19:38:01:

In Reply to: Striking 330/M3 Similarity posted by Mystikal on July 25, 2000 at 19:02:36:

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.

If the M3 weights the same as the 330 (ie. I think we now know the weight of the M3 :-)) Then having the same Rotor size makes sense. The things that start to take into account stopping distance is brake fade and how the rotor disapates (sp) heat. So BMW can easly use the same size brakes on the 330 and on the M3 but if the M3's brakes have a better caliper (which I am sure it will) and I know in Europe it will have the Floating rotors like the Euro M5 but it may not have it here in the states then it does not matter. BMW will use a higher performance higher cost pad then all is really well. The reason that people up grade to a larger brake and rotor and caliper like Brembo is because they are adding more hp and the car usually has very little brakes to begin with, and they need a better rotor and a bigger caliper to grip the brake better. That is all, I hope it makes sense.

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