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      02-25-2012, 09:01 PM   #45
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Drives: E92 M3s, R56 Cooper S
Join Date: Jun 2009
Location: EC

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Originally Posted by spdy330 View Post
Now I have a question to everyone else simply because I do not know the answer. Why is each pair of rotors different? Two rotors seem to have smaller drilled holes (unless photos are deceiving) and the one with smaller holes has what looks like clips going around it. I would believe that this determines which go in the front verses the rear but why is this?
Front and rear rotors are not identical - they have the same diameter but not the same thickness. The front rotor is a floating rotor whereas the rear rotor is hard mounted to the hat (rear hat has the brake drum for the parking brake shoes).
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