For you brake gurus.
#1
For you brake gurus.
Can someone tell me what this small disc in the rotor is for? It doesn't appear to be on any other rotors except the stock ones. In the picture in the link, it's at the top of the picture, just below the braking surface.
http://www.harley-davidson.com/store...-03-4495008--1
http://www.harley-davidson.com/store...-03-4495008--1
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