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  1. Impossible to tell, as the other poster said, put a straight edge up to it to see the degree of how concave it is, if any.

    My experience with carbon brake tracks is that they will last forever if not ridden in the rain and kept clean, my DT Swiss ARC 1100 Dicut 62s are still like new after 15,000 km, you can only tell that they are used because the surface is slightly glossy where the brake pads do their job.

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