Speedometer 99 Vmax

[jwood]

I took a ride today with 17 other bikes, and noticed "we" were all riding at 75MPH on the open road as a group! I pulled up to another bike and his speedometer was showing 65 and mine was 75... I am running a 170 rear with stock rim, and a stock tire size on the front with stock rim, what would be causing the speedo to be off 10 MPH ???:ummm:

 

[naughtyG]

A lot of speedos are badly calibrated and usually optimistic. 10% is very common, so at 77 mph you're doing 70.

Best way to find out true speed is looking at a satnav system, your other bike speedo may have been as far out the other way as yours, so you may actually have been doing 70 mph..

 

[bazwell]

+1 ^

 

[jwood]

Are the speedometers able to be calibrated by a speedometer shop? We have a geans speedometer here in Cincinnati...

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