5
5-7HEAVEN
Guest
I use a 5:1 pocketbike transmission. It connects to an 11-tooth engine sprocket to 63-tooth chainring. Using 8mm chain for this connection. Then I use a 30-tooth chainring sprocket with bicycle chain. This connects to 11t-34t rear cassette. I have a shift kit, and my first gear is 32.45:1.....
In 8th speed, the gear ratio is 10.5:1.....for high speed.
You do not have a 5:1 transmission, so producing a good working gear ratio is not easy. Using 8mm parts makes it easier to make gear ratio than bicycle chain or 415 chain. Maybe you can use 6-tooth engine sprocket to 15-tooth intermediate step at the jackshaft(axis). Then 10-tooth to 72-tooth on wheel hub.
15/6 = 2.5...
72/10 = 7.2.....
2.5 x 7.2 = 18:1 gear ratio.....good starting point.
Find a rear hub for disc brake. Then drill 72-tooth sprocket to bolt onto disc brake flange.
That should work.
In 8th speed, the gear ratio is 10.5:1.....for high speed.
You do not have a 5:1 transmission, so producing a good working gear ratio is not easy. Using 8mm parts makes it easier to make gear ratio than bicycle chain or 415 chain. Maybe you can use 6-tooth engine sprocket to 15-tooth intermediate step at the jackshaft(axis). Then 10-tooth to 72-tooth on wheel hub.
15/6 = 2.5...
72/10 = 7.2.....
2.5 x 7.2 = 18:1 gear ratio.....good starting point.
Find a rear hub for disc brake. Then drill 72-tooth sprocket to bolt onto disc brake flange.
That should work.