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  1. 250r Front and Rear Sprocket teeth differences

    I'm doing a new build on a 250r and I'm ordering a new chain and it comes with new sprockets. I can go up or down 12 to 14 on the front and i think 38 39 on the rear. Don't quote me there was about million combinations but one i did see the front was 14 and the rear was 36. Anyway I have the...