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Old 02-14-2012, 10:28 PM
5-7HEAVEN 5-7HEAVEN is offline
Motorized Bicycle Elite Member
Join Date: Aug 2008
Posts: 1,912
Default Re: what did you do to your motor bike today?

Originally Posted by Skarrd View Post
Got a 40t #25 gear in today for the pocket bike jackshaft.

6t-40t = ~6.67:1 reduction
10t-44t = 4.40:1
40t-28t = .70:1
final drive in 1st gear = 20.53:1

should work out for some nice gearing.
Interesting combination...pb engine, midframed w/shift kit.

What gears are you running? 7/8-speed cassette? 3-speed internal hub?

FWIW, my gear ratio in 1st gear is 46.32:1. It's like a granny gear for climbing steep hills, and 8th gear is highway gear @ 15:1.

Your 1st gear is 20.53:1.

My 6th gear is 20.45:1, and I'm @ 30-something mph in that gear.

You might want lower gear ratios.

Last edited by 5-7HEAVEN; 02-14-2012 at 10:53 PM.
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