How do u work out the speed ur going using the rev's?

[Snowface]

Is it Rev's x Gear ratio?
like 2000rpm x 0.71(5th gear)?
thanks

[Dicko]

nah, u need to work out the circumference of ya wheels, cuz most people have differnt size wheels.

then u need to know the final drive and gear ratio of the gear your in, make sure u know exactly which box u have as there different.

also rev counters are not 100% accurate.

its pretty difficult to get it spot on to be honest!

[wisewood]

best thing to do is ask in tech forum as someone has managed to do this before i am sure of it.