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The SAE
Standard for Speedometers on American cars is set up so that the
speedometer cable will turn 1,000 rpm at 60 mph or 1000 revolutions in
1 mile.
Simply multiply the rear axle gear ratio by the
speedometer drive gear, divide that by the tire diameter and multiply
this by 20.2 (a constant).
The following
formula can be used to determine the correct speedometer driven
gear.
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