help with gear ratio on a motorized bike!?

B

brandon

New member
im building this motorized bike out of my old jesse james chopper with 20" wheels, and a 50cc chainsaw motor. Im trying to get a ratio of 13:1 and i was wondering if i had a sprocket on the front that had ten teeth, then what would i use on the back. i know by math that it should be 130 toothed sprocket, but that doesn't sound logical. thanks for your time
 
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