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GEAR RATIO CALCULATOR. Read off your mph at any rpm in any gear. Enter transmission and rear tyre data in the yellow boxes. Tyre diameter is automatically calculated from tyre profile info e.g. 195/55 x 15 = 24.44 inch tyre diameter.
By inputting some basic variables, our calculator can help you on your path to determine the most suitable gear ratios for your vehicle/application by calculating the maximum speed possible in each gear as well as the rpm when you shift up a gear from max rpm (Shift Point).
Established in 1981, RaceGearBox.com is a specialized manufacturer of custom transmission systems including gear sets, shafts and splines and power train related components predominately for, but not limited to, the Automotive Racing Industry.
Use our simple Gear Ratio Calculator to quickly find the correct gear ratio for your ring and pinion gear set. Save yourself the headache and let us figure out your ring-and-pinion gear ratio! Select the value you want to solve for. For the Tire field, enter your tire diameter in inches.
This gear calculator will provide expected (theoretical) speed at certain RPM through all gears. Please fill in tyre dimension, transmission gear ratios and wanted final drive (differential gear ratio) to see what speed you can expect.
Gear Ratio Calculator. Ring-and-pinion selection made easy! Save yourself the headache and let us figure out your ring-and-pinion gear ratio! Just type in your info (example: 5000 RPM), press calculate, and you’ll get the right ratio without the guesswork.
To find the ideal gear ratio for cruising use your RPM at peak Torque. Example: If your max Torque is at 3300 RPM use 3300 for the RPM. Calculate Rear End Gear Ratio needed. Enter RPM:
