Calculate

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.


Put in Revs Known speed KM/H Known speed MPH


Crank Clutch

Engine Rear wheel



Gearbox ratio Calculated wheel

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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.


Revs KM/H MPH

Crank Clutch

Engine Rear wheel

Gearbox ratio


Here you can check every gears speed

KM/H
Speed 1st
Speed 2nd
Speed 3rd
Speed 4th

MPH
Speed 1st
Speed 2nd
Speed 3rd
Speed 4th

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Here you can laborate with the internals in the gearbox.
Just for advanced users ;-)
Standard BSA B50 / B25 in boxes.
( MX has 18 Mainshaft & 25 Layshaft om 1st)

Mainshaft 1st Mainshaft 2nd Mainshaft 3rd Mainshaft 4st

Layshaft 1st Layshaft 2nd Layshaft 3rd Layshaft 4st

Ratio 1st Ratio 2nd Ratio 3rd Ratio 4th






© 2012 Rickard Nebrér www.b50.org