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Old 12-06-2008, 12:32 AM
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!

Originally Posted by conradcliff View Post
Here's a good least I think it is..SBP's kit only uses a 17 tooth sprocket on the input side of their kit and say:

Why are their ratios so different? It seems like something is amiss.

Edit: Ohhh, I think I read somewhere that the china engines have an internal gear that right?
When he mentions 58t sprocket and 5.8:1, you must multiply this by 4.15 internal gear reduction to calculate to 24.07:1.

Multiply 2.7 by 4.15) internal gear reduction to get 11.21:1 top speed gearing.

The ratios are so different because he is using all the gears in the cassette.

Can you see that the SPB kit has 11.21:1 final gear?

Last edited by 5-7HEAVEN; 12-06-2008 at 12:37 AM.
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