It is a heat sink for the rotor and even with hard riding, nothing bad will happen. I personally couldn't wait for that ugly thing to get off my bike. But I did notice my rotor slightly purple on the edges.
Does that plastic cover over the rear disc serve a purpose? It's really ugly IMO. Is there a good reason NOT to remove it?
That's crazy - I was just about to post the same question! I pulled mine off yesterday after removing the rim (getting new tire mounted tomorrow). Only thing I could figure out was that it added strength and kept the rotor from warping. It covers up some slats, so would think they would help with heat. I'm considering cleaning up the rotor and keeping the cover off if can find some shorter bolts.
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