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Guys...the speedo reads the rotation of some component in the drive train Different tire circumferences will effect actual speed, and will effect a discrepancy between actual speed and the speed indicated on the speedo, but the tire circumference will not change the speedo reading.
If a 10 inch wheel is turning at 1000 RPM, or if a 20 inch wheel is turning at 1000 RPM, the speedo will still read the same. The only "data" the speedo sees is rate of rotation. You can jack it up and take the wheels off, and the speedo will still read the same.
Tire size alters actual speed. Tire size has no effect on speedometer reading.
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