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Old 06-09-2003, 07:01 PM
Arthur Dalton Arthur Dalton is offline
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,784
The speed/rev relationship doesn't change.. the Actual ground speed does..
So, if one were check speed accuracy , tach rpm can be used .
Knowing ratio and tire size tells one what RPM will produce
Actual speed..
I drive 2 of my Vintage cars and monitor speed via tack [ per 1000 rpm] as one has had diff. gear change and the other is Km only...just by habit..
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