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How many teeth do the newer 520 chain models have on the rear sprocket?
I got it to work by making my own keeper and grinding the socket screw heads to a smaller diameter. Gear ratio now is 3.33/1 which is better for my uses. I had been riding it for over a year with a 3.07/1 ratio but 4th gear rarely got used. The original ratio is 2.67/1 which is WAY to tall.
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