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Old 07-09-2020, 03:03 PM   #2
Werner
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Join Date: Jan 2019
Location: Germany, near Aachen
Posts: 1,159
Default Re: Speedometer error

Hi Bob,

correct. With the wear of the tire rubber the outer diameter is minimally reduced. As a result, because of the smaller diameter the wheel turns faster than a new wheel for true spped. Your speedometer showes you a higher speed.
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Werner


Ford Model A, Roadster, 1928
Citroen 11 CV, 1947
Hercules W 2000, 1976; (with NSU-Wankel Rotary Engine), Canadian version
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