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Old 12-05-2008, 09:04 PM
5-7HEAVEN 5-7HEAVEN is offline
Motorized Bicycle Elite Member
Join Date: Aug 2008
Posts: 1,912
Default Re: Need mental and ratio help! Please!

Change the engine sprocket to 6t and the first input jackshaft sprocket to 24t. You'll arrive at a negligible fraction off of the first calculator.

You will arrive at 6.87:1 on first calculator and 6.85 on second calculator, which is WAYYY too high of a gear for 6,000rpm/7,000rpm engine range.

The last sprocket combo from crankset to rear drive sprocket is NOT a gear reduction.

For 40mph at 6,000rpm, gear ratio should be 11.6:1.

For 40mph at 7,000rpm, gear ratio should be 13.55:1.

more info later.

Last edited by 5-7HEAVEN; 12-05-2008 at 09:15 PM.
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