MPH to RPM converter with G-force How fast is the car going (MPH) ?: What is your rim size? (diameter): 12 inches 13 inches 14 inches 15 inches 16 inches 17 inches 18 inches 19 inches Other (specify below) Specify rim: What size is your tire? (distance from rim edge to outside of tire - tread): 2 inches 3 inches 4 inches 5 inches 6 inches 7 inches 8 inches 9 inches Other (specify below) Specify tire: The RPM for your tires at MPH is: RPM, or RPS. Your tire tread is spinning with a G-force of Gs.
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