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Old 11-19-2009, 05:00 AM
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bairdco bairdco is offline
a guy who makes cool bikes
Join Date: Aug 2009
Location: living the dream in southern california
Posts: 6,260
Default Re: Mechanical speedometer

the biggest problem with those cheap speedos is vibration. they're not designed to hammer down bumpy roads at 30+.

get some rubber washers, or make something to isolate it from shaking around, and it'll work.

the other problem is accuracy. i've seen videos where people claim 40+ speeds, and there's a cow in the background doing 50 (not really, but you can see where i'm going with this.)

calibrate it with a stopwatch, or pace a buddy's car, or else it's just a toy strapped to your handlebars.
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