Speedometer Calculator Gear Ratios, Disclaimer: This form is only to be used for estimation purposes. If in doubt use manufactures posted diameter. Stop guessing and avoid speeding tickets with precise speedometer calibration. It’s a practical tool whether you’re tuning for performance, looking after a fleet, or working out ratios for motorsport—any job where you need the drivetrain to work To determine the correct gear ratio of the speedometer for your car, use the following formula to calculate the number of teeth on the driven gear (round to the nearest available gear): Use the Spicer Transmission Ratio RPM Calculator to determine your engine’s RPM based on the transmission gear ratio, tire height, MPH, and ring and pinion gear ratio. Use our advanced speedo gear calculator to determine the correct speedometer gear teeth needed after changing tire size or axle ratio. TRANS-01, Speedometer, Gear Ratio, and Tire Size Calculator Acrobat Printable Version These calculations will not only help you determine your speedometer error, but will also help you determine your maximum speed in any gear for a given gear set. Speedometer Gear Calculator Enter the number of drive teeth, axle ratio, and tire diameter to calculate the right speedometer driven gear. Calculate the correct speedometer gear for your vehicle using Monster Transmission's tool by entering drive gear teeth, rear gear ratio, and tire height. These numbers correspond to the number of revolutions the speedometer cable must make to register one mile on the speedometer. They consist of a small "driven" gear that meshes with a larger "drive gear" installed onto the transmission output shaft. Most older GM speedometers are 1000. This calculator helps determine the correct speedometer drive gear based on tire size changes and axle ratio. Speedo Gear Calculator by Wallace Racing Todays date is 8/6/2026 Wallace Racing BACK to Calculators Speedo Gear Calculator At the bottom of the speedometer face, look for the numbers 940, 960, 1000, or 1020. Feb 23, 2026 · This Differential Gear Ratio Calculator lets you work out actual vehicle speed and wheel RPM given the gear ratio, tire diameter, transmission ratio, and engine RPM. Speedometer Gear Calculator Enter your tire size Tire diameter may vary slightly depending on the manufacturer. These gears play a pivotal role in measuring your vehicle's speed and ensuring your speedometer provides accurate readings. Check Compare and enter alternate Tire Diameter or Diff Ratio. TCI® now stocks the most po Apr 11, 2026 · Gear Ratio Speedometer Calculator Calculate speedometer correction, actual vehicle speed, and required speedometer gear teeth for any tire size or axle ratio change. Jun 16, 2023 · Speedometer gears are crucial components located inside the rear of your transmission. Ensure your speedometer is always accurate. Speedometer will display a second needle for the comparison. A higher tooth count drive gear increases speedometer reading, while a lower tooth count decreases it. Say, for example, you need to calculate the gear ratio for bigger tires. . Use the Tire Height Return to the gear ratio calculator This form allows you to calculate tooth counts for mechanical speedometer drives. Use our advanced speedo drive gear calculator to determine the correct speedometer driven gear for accurate speed and odometer readings after tire, axle, or transmission changes. The following formula will work for any GM, Ford or Chrysler vehicle and is very useful when there is no established baseline from which to work from such as replacing a transmission in a vehicle that was purchased without a drive line. Built‑in P‑metric converter. Enter your engine RPM, axle ratio, and tire height to get started. Calculate the correct speedometer driven gear based on tire size, axle ratio, and drive gear. Our free Speedometer Driven Gear Recalibration Calculator helps you determine the exact driven gear teeth needed when upgrading tire sizes or changing axle ratios. Exact results of combining equipment may vary from the estimates provided in this form. Edit gear ratios, or enter (and save) multiple ratio sets, then click Compare Ratios to display multiple graphs and compare. The accompanying charts show what gears were manufactured for each type transmission. Calculate gear ratios and vehicle speed for any TREMEC transmission. BETA RELEASE send any comments or suggestions to the email address below. The speedometer gear calculator helps you out with the size or number of teeth on the gear you need based on the size of the tire. sfqbr, mxm0o, 9a, lllld, zly4, n846ok, d5nd, rcjko, 6lly, snu,
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