Originally Posted by dracothered
Well I bought (ordered) my pulleys for the primary drive on my bike finally and worked out the sizes needed. The one coming off my output shaft will be a 2.3" which will go to a 4.45" pulley on the jack shaft. This will give me a jack shaft speed of 1808.98 RPMs from an engine speed of 3500 RPMs. Here is the formula I used to get these figures:
RPM1 = RPM of Driver
RPM2 = RPM of Driven
D1 = Diameter or tooth count of Driver
D2 = Diameter or tooth count of Driven
RPM1 * D1 / D2 = RPM2
3500 * 2.3 / 4.45 = 1808.98 RPMs
1808.98 * 14t / 40t = 633.14 RPMs going to a 24" wheel.
Then I used the Gear Ratio Calculator program that has been listed on this forum before to get my final output of 5.53:1
with a top speed of 45.2 MPH
. Now I don't really think I will get that top speed, but it would be great if I could.
45 (.2) mph would be great. But if ya just get 40mph out of it, thats plenty fast enough for a bicycle, dont'cha think? 35 or so is fast enough for me, (and I'm just a little crazy.) Good luck with it anyway.