190mph = 305kmh, Correct?

**Cajun** · 25th May 2007, 16:36

hmmm i just do mph * 1.6 = KM
and if you want the reverse km /1.6 = mph

**Chrislost** · 25th May 2007, 17:42

Originally Posted by onearmedbandit

To work out km/h to mph simply divide by 1.609, or vice-versa. For example 190mph = 305.71km/h.

8/5 is 1.6...

**imdying** · 25th May 2007, 18:04

Suckers and your math... This is what ya want!

**sAsLEX** · 25th May 2007, 22:55

Originally Posted by Disco Dan

Thats right...

Only thing thats tricky now, is working out the inaccuracy in the spedo at higher speeds....

Originally Posted by skidMark

or like you know they changed the gearing so it put the speedo out duuuhhhh

or the tires have a larger circumference at that speed due to the higher rotational speed of the wheels????

**Arthur** · 26th May 2007, 12:45

Originally Posted by onearmedbandit

To work out km/h to mph simply divide by 1.609, or vice-versa. For example 190mph = 305.71km/h.

Bugger - you beat me to working it out. Bling added...

**skidMark** · 26th May 2007, 13:55

Originally Posted by sAsLEX

or the tires have a larger circumference at that speed due to the higher rotational speed of the wheels????

that too but only with old bikes

but on newer bikes that makes no difference.....as it reads off the gearbox not the wheel...thus u change a tooth it thinks ur going whatever speed when in relaity the wheel is spinning at a higher / lower speed depending if u go up or down teeth.

ya get it?

**Forest** · 26th May 2007, 15:52

Originally Posted by skidMark

that too but only with old bikes

but on newer bikes that makes no difference.....as it reads off the gearbox not the wheel...thus u change a tooth it thinks ur going whatever speed when in relaity the wheel is spinning at a higher / lower speed depending if u go up or down teeth.

ya get it?

Do modern bikers really read from the gearbox? My bike has an optical sensor that reads from a rotating track on the front wheel.

If it reads from the gearbox, how do you compensate when you change the gear-box ratios, sprocket sizes, or wheel sizes?

**imdying** · 26th May 2007, 16:05

Originally Posted by skidMark

ya get it?

Ahhh, I think the one not getting it is you...

**slofox** · 11th June 2008, 19:00

189.518213632285mph if you are a pedantic old fool like me.......

To convert km to miles, multiply by 0.62....rough but close.

**sinfull** · 11th June 2008, 19:11

Guess there is only one way to truely check ya speedo at hight speeds ! Find yaself a radar trap and do ya top speed coming up on him ! Then ask to see a callibration cert for said radar gun !

**R6_kid:Me** · 11th June 2008, 19:15

Originally Posted by skidMark

that too but only with old bikes

but on newer bikes that makes no difference.....as it reads off the gearbox not the wheel...thus u change a tooth it thinks ur going whatever speed when in relaity the wheel is spinning at a higher / lower speed depending if u go up or down teeth.

ya get it?

-1 to you mark... if the wheel has a larger circumference it alters the reading the same as a sprocket does... same as more teeth on the sprocket.

Mr Forest...

I believe the sensor + track on your wheel is actually ABS.