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@redeye
I've been experimenting with different gear ratios recently to try and get a slightly lower ratio with my 48t ring. I bought a cheap 19t sprocket from someone off ebay, left pos feedback as it looked ok, fitted it and it turns out that its, and I think the correct engineering term is, it's pissed. ie the "hole in the middle is off centre. this was confirmed when I took it off and got a ruler up against it. Also, the old 18t sprocket is fine.
What can you do with a pissed 19t sprocket?