This is a calculator you can use to check what speed different ratios in gearbox and cogs on wheels gives.
This calculator is based on that you known what revs you have at a particular speed ie 5000 revs at 80mph.
First part: Type in known revs / speed ( KM/H or MPH, not both ) ,
what cogs you have on crank, clutch, engine & wheel.
What you get from this calculation is gearbox ratio and circumference of the rear wheel.
Start here and then go over to Second part.
Second part: Type in revs ,
Laborate with changes in cogs you have on crank, clutch, engine & wheel.
What you get from this calculation is different speed according to changes in revs / wheel and gearbox ratio.
© 2012 Rickard Nebrér www.b50.org