Network Calculators. Web Equation. Speed versus RPM calculator. Speed versus RPM Calculator <p><b>Note: The calculator will not work because Javascript is not enabled in your web browser.
</b></p> Tire Expansion: There is a potential for error in these calculations with bias-belted tires due to centrifugal force expansion of the tire at high speeds, but that effect is generally negligible for radial-ply tires due to the circumferential belts used in their construction. Speedtest.net - The Global Broadband Speed Test.