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Bike I recently picked up and looking to make it even better than it is. 2017 CRF250R 18” rear, and 250X forks QS138 V3 72V BAC8000 Home made 72V 34ah battery Gearing is currently 12/63 using a 428 setup, which I think I want to change. I have a 12T 520 front sprocket that came with the...