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Old 11-03-2011, 05:36 PM
gokart25 gokart25 is offline
Motorized Bicycle Elite Member
Join Date: Sep 2011
Location: Iowa
Posts: 245
Default What RPM on tach=what speed

I just got a tach put on my bike (80cc).
I have a speedometer on it too.
I would like to get some input from everyone..
I am trying to see if the tach is reading the right RPM's.
What is a good benchmark. (25MPH=5000PRM)

My front sprocket is what came stock in the kit, and my back sprocket is 40tooth.
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