Power Hungry Performance Forum > FAQ Utilities

User Name Remember Me? Password

Search FAQ
Search Word(s): Matching Options: Match Any Words Match All Words Match Complete Phrase Search in: Search Titles Only Search Titles & Text

Tire Size and Rev per Mile Calculator

Use this calculator to determine the tire diameter and revolutions per mile for a given tire size. This calculator is for informational purposes only and does not take into account variables such as variations in tread depth or inflation pressure. Please consult your tire manufacturer's documentation for additional information and specifications. Tire Tread Width Sidewall Aspect Ratio Wheel Diameter Tire Squish% Tire Diameter (in inches) Tire Diameter (in mm) Tire Circumference (in inches) Tire Circumference (in mm) Revolutions per Mile

Miscellaneous Calculators

Miscellaneous Calculators   Calculate HP from 1/4 Mile Trap Speed Vehicle weight in pounds (including driver)  lbs 1/4 mile Trap Speed in M.P.H.  M.P.H.   You are making:  HP at the rear wheels and  HP at the flywheel*. JavaScript must be enabled in your browser for the calculation to work. *Note:  Assuming a 20% drive train loss. Calculate HP from 1/4 Mile ET Vehicle weight in pounds (including driver)  Lbs 1/4 Mile ET in seconds  Sec   You are making:  HP at the rear wheels and  HP at the flywheel*. JavaScript must be enabled in your browser for the calculation to work. *Note:  Assuming a 20% drive train loss. Calculate Tire Diameter Tire width - Series - Wheel Diameter Example 275 - 60 R 15   Tire Width Tire Series Wheel Diameter   The tire diameter is  inches and  Revs per Mile JavaScript must be enabled in your browser for the calculation to work. *Note:  Does not account for tread loss or inflation pressure. Calculate MPH for RPM range   Tire diameter Trans Ratio Axle Ratio         1000 RPM   MPH 4500 RPM   MPH     1250 RPM   MPH 4750 RPM   MPH     1500 RPM   MPH 5000 RPM   MPH     1750 RPM   MPH 5250 RPM   MPH     2000 RPM   MPH 5500 RPM   MPH     2250 RPM   MPH 5750 RPM   MPH     2500 RPM   MPH 6000 RPM   MPH     2750 RPM   MPH 6250 RPM   MPH     3000 RPM   MPH 6500 RPM   MPH     3250 RPM   MPH 6750 RPM   MPH     3500 RPM   MPH 7000 RPM   MPH     3750 RPM   MPH 7250 RPM   MPH     4000 RPM   MPH 7500 RPM   MPH     4250 RPM   MPH 7750 RPM   MPH   JavaScript must be enabled in your browser for the calculation to work. Calculate Rear End Gear Ratio Enter the tire diameter in inches, rpm's of the motor at a certain speed as indicated by your speedometer in MPH. This calculation assumes the car's transmission is in drive or 1:1 ratio, no overdrive.   Tire Diameter (in) RPM Speed at RPM (MPH)   Rear End Gear Ratio JavaScript must be enabled in your browser for the calculation to work.