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Old 07-09-19, 05:28 PM
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G_I_B_B_O_N
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Chain Rub Near Rear Dropouts

I'm having some some problems with my chain rubbing my frame when it's on the smallest sprocket. My bike's an old RB1 that I'm in the process of overhauling. I read over Sheldon Brown's article on frame/hub spacing, but I'm not sure if this will solve the problem. I measured my rear dropouts and they are a hair short at 129mm instead of the usual 130. I recently replaced my chain with a KMC 9 speed one. Not sure if this is the cause as I didn't notice this contact in the past. The chain isn't always in contact with the frame. At rest, there's probably about 1mm between them, but while moving, it'll bounce around enough to rub it. Any suggestions?



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