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trailtech vapour speedo for yz450f,correct wheel circumferernce

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hi guys,want to check that my vapour speedo has the correct wheel circumference setting for my yz450f supermoto,could you please tell me if i'm correct.......... i have a 17 inch front wheel....converted to mm is 432mm and according to trailtech you then times that by 3.14 giving a circumference of 1356mm that you programme into the speedo to give correct speed,does this sound correct please guys?

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Do you need circumference of the wheel or the tire for that speedo?

I would think you would want the Tire.

If so just measure across the tire and get your diameter then multiply times 3.14 for circumference.

Later, Jason

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This question makes perfect sense after reading your other thread. If you are using the wheel and not the tire that is going to give you a slower speed on your speedo. Hope this is all it is.

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This question makes perfect sense after reading your other thread. If you are using the wheel and not the tire that is going to give you a slower speed on your speedo. Hope this is all it is.

ok,previous owner had circumerence set at 1550 where the actual tyre with top to bottom is 585mm giving a circumference of 1836mm....bigger,not sure how big a difference to the speedo this will be but sure it will be different,just hope ive not been caught by any speed cameras whilst riding with a slow speedo

Edited by adamshackleton
wrote wrong

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