some my buddies notices on my last ride to the mountains. it is stuck to rear wheel. doesn’t feel oily. looks like black sand with very fine metal flakes. i have rear wheel off. everything looks normal. any ideas?
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That is probably what it is—road residue along with metallic dust from brake pads (assuming semi metallic pads).on a footnote, we did ride lots of ridin on new roads. could be kicked up from the road. Foothills Parkway was just recently completed we rode the whole thing end to end