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What can I do about this crack in the sidewall of my rim? Last night I was riding home on my Boardman team hybrid, I rode up a speed bump horizontally and hopped up onto the pavement, but the back wheel just about hit the curb and my inner tube popped due to the rim bending inwards a bit. I got the bend out with a claw hammer and now the sidewall of the rim is cracked slightly. Also how can I blacken the scratches on my matte black rims?