Speedometer Gear Ratio Calculator, Free calculator with preset configs.

Speedometer Gear Ratio Calculator, SPEEDOMETER GEAR CALCULATOR Speedometer Gear Calibrator View helpful calculators for Tire Size vs Transmission, Differential, RPM, and Speed/gear and Transmission, Differential, and RPM at Modern Driveline. This will only be approximate of your corrected speed. Even small diameter changes alter speedometer If you are using different size tires and/or different gear ratios than are listed above, you can use this simple formula: Speedometer teeth = 270. The speedometer gear calculator assists you in calculating the size of the gear you need for your vehicle's speedometer. These changes often lead to an inaccurate This calculator is designed to determine the difference between the indicated speedometer speed and the actual speed after a change of gear ratio on the ring gear and pinion. Supports P-metric & inch sizes for trucks, cars & motorcycles. Enter gear ratios, primary ratio, sprocket sizes and tire diameter, then drag RPM slider to calculate speed from RPM. Another vital piece of info is the speedometer drive/driven gear ratios, the gears inside Most speedometers (modern ones) are 1000 revs/mile, and this is a good starting number to use. Works for motorcycles and mopeds. Our guide helps you calculate the perfect setup for low-RPM cruising and blistering acceleration. This is because your speedometer is controlled by two small The differential gear ratio RPM speed calculator is an essential tool for automotive engineers, performance enthusiasts, and vehicle designers. Free calculator with preset configs. Find the correct speedometer driven gear teeth after changing tire size or axle ratio. To fix the issue, different speedo gears are available. Use our scientific calculator to find the correct gear size for accurate speed readings. Assume you own a GM vehicle and decide to upgrade Gearing Calculator Check to see how far off your speedometer is with your new different size tires. Drag Max RPM slider to adjust the range of the RPM and Speedometer Gauges. The Speedometer Gear Calculator is designed for automotive enthusiasts and mechanics who have changed their vehicle's tire size or rear axle gear ratio. Calculate your vehicles speed & gear ratios with our advanced but easy to use calculator. BETA RELEASE send any comments or suggestions to the email address This calculator helps determine the correct speedometer drive gear based on tire size changes and axle ratio. If in doubt use manufactures posted diameter. It uses four main inputs: Drive gear tooth count Axle Most speedometers (modern ones) are 1000 revs/mile, and this is a good starting number to use. Use our speedometer gear calculator to adjust or choose the right gear ratio. Includes a rich graphical interface 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 Free tire size calculator with gear ratio analysis. Using the Classic Mini Calculate your cruising or top end speed and RPM based on rear gear ratio and tire size with a TREMEC manual overdrive transmission Ford Speedometer Driven Gear Calculator Enter the input values below and click compute. Enter tire size, axle ratio, and drive gear to get accurate results and minimize speedometer error. Depends on the accuracy of tire size diameters. A vehicle uses the speedometer drive gear to estimate its speed based on Calculate gear ratio speedometer correction instantly. We have tried to compile a gear selec on that will work for most street gear CALCULATOR Gearbox Calculator When building or rebuilding a gearbox, updaing your gear ratios, or changing out your speedometer sometimes you need to update some things. The T5 Speedometer Gear Calculator helps you determine the correct speedometer gear for your T5 transmission. Once you have entered those Edit gear ratios, or enter (and save) multiple ratio sets, then click Compare Ratios to display multiple graphs and compare. Determine drive and driven gear teeth based on tire diameter, axle ratio, and gear specifications for accurate speedometer readings. Look at the chart to determine the correct gear size. Use our advanced transmission speedometer gear calculator to determine the correct driven gear teeth for your vehicle's tire size, axle ratio, and transmission. Enter the number of drive teeth, axle ratio, and tire diameter to calculate the right speedometer driven gear. This is particularly crucial after modifications to If you change tire size or rear-end gear ratio, your speed and odometer will be off. Speedometer Pinion - tooth speedometer pinion required Overall Gear Ratios Speedometer gears are crucial components located inside the rear of your transmission. Use this simple Gear Ratio Calculator to determine your gear ratio and vehicle’s speed in any gear and any engine RPM for best performance. The TREMEC Toolbox App for iOS and Android smartphones will help you simplify driveline setup, predict the effects of changing gear ratios and tire size, and That said, you first need to figure out what gears you have in your transfer case (you already know your tire OD and final drive ratio). Calculate the correct speedometer gear size for your vehicle. We offer 6 gears to choose from. 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 Speedometer Gear Calculator Enter your tire size Tire diameter may vary slightly depending on the manufacturer. D. Once you have entered those fields in click Submit. 11, etc. Our free Speedometer Driven Gear Recalibration Calculator helps you determine the exact driven gear teeth needed when upgrading tire sizes or changing axle ratios. Replacing a Speedometer gear, trying to figure out how many teeth you need for your new tire or rear axle ratio? This tool will help with the calculations. 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): Gear Ratio Speedometer Calculator Calculate speedometer correction, actual vehicle speed, and required speedometer gear teeth for any tire size or axle ratio change. driven gear teeth = (rev/mile × drive gear teeth × axle ratio) ÷ 1,001 You can also use our speedometer gear size calculator to find the right number of teeth for the The transmission calculator helps you quickly determine vehicle speed, RPM, and the right transmission and differential gear ratios. Calculate how sprocket changes affect your top speed or find the perfect sprocket size to reach your desired speed. Export results for shop records and tuning notes Here is a list of common transmissions with their drive and driven gear teeth numbers Instructions Drive Gear Teeth - The Number of teeth for the transmission Rear End - Rear Gear Ratio (3. This calculator will provide the speed of the vehicle based on transmission gear ratio, engine RPM, tire height, and the ring gear and pinion gear ratio in the rear end axle differential housing. Ensure accurate speed readings and avoid Gearbox & Speedo Ratio Calculator Ratio Calc Speedo TPM Engine Nos Xpin Guide Spigot Bearing Synchro Tool Rebuild Guide Ministox Windage Tray Select Details Tyre Size Drop Gear Ratio. Always Measure your engine’s RPM based on the ring gear and pinion gear ratio, speed, and tire height, with the Spicer Engine RPM Calculator. How to calculate your speedometer gear & rear axle ratio Alf's Mustang Garage 18. 89, 3. To calculate what gears you need, you first need to Gear Ratio Calculator Use our simple Gear Ratio Calculator to quickly find the correct gear ratio for your ring and pinion gear set. Determine drive and driven gear teeth based on tire diameter, axle ratio, and gear specifications. SUM-700321 TH-350 Speedometer Gear Kit Selec on Chart and guideline Thank you for purchasing our speedometer gear kit. Enter drive teeth, axle ratio, and tire size to get results instantly. Example of GM Speedometer Gear Calculator Let’s walk through a practical example using the GM Speedometer Gear Calculator. The Speedometer Gear Calculator is a tool designed to help you determine the correct speedometer gear needed for your vehicle, ensuring your speedometer accurately reflects your vehicle's speed. This calculator helps users determine the correct number of teeth for a Speedometer Gear Calculation Speedo Revs/mile = (20168 x DiffGear x DriveGearTeeth) divided by (Tire-diameter x Driven-GearTeeth) Speedometer Calibration How to Speedometer Gear Calculator Changing tires to a new size or changing rear-end gears can have an impact on speedometer accuracy. Speedometer Gear Ratio Calculator Calculate speedometer gearing with tire and axle changes. 11) Rear Tire Height (Tire Diameter in Inches) Drive Gear Teeth * Factory Reducer Installed • Understanding Speedometer Gear Calculation The speedometer gear calculation involves determining the appropriate size of the driven gear based on the tire diameter, axle ratio, and the number of teeth Gearbox & Speedo Ratio Calculator Ratio Calc Speedo TPM Engine Nos Xpin Guide Spigot Bearing Synchro Tool Rebuild Guide Ministox Windage Tray Select Details Tyre Size Drop Gear 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 Free motorcycle gear ratio calculator. Restore accurate speed readings easily. Check Compare and enter alternate Tire A Speedometer Gear Calculator is a tool used by automobile enthusiasts, mechanics, and professionals to ensure the accuracy of a vehicle’s speedometer. Compare drive, driven, and correction gear ratios. 225/60R16) The calculators on this page were borrowed with pride from Jim The Mustang Speedometer Gear Calculator is a highly specialized tool designed for Ford Mustang enthusiasts, mechanics, and owners. The 700R4 Speedometer Gear Calculator is a valuable tool used by automotive enthusiasts and professionals to determine the appropriate gear ratio needed for accurate Description Mechanical Speedometer Gears for Tremec Transmissions. This calculator helps users accurately determine the Once you change the gears in your differential, you need a new speedometer gear to recalibrate your speedometer. 7K subscribers 250 1. 3. This will calculate the speedometer driven gear needed to properly calibrate your speedometer. Calculate the correct speedometer gear for your vehicle using Monster Transmission's tool by entering drive gear teeth, rear gear ratio, and tire height. A higher tooth count drive gear increases speedometer reading, while a lower tooth count Speedometer Driven Gear Calculator Driven gear tooth count = Drive Gear tooth count x Axle Gear Ratio x Drive Tire Revolutions per Mile (or 20168 / Drive Tire Diameter) / 1001 Discover the best speedometer gear ratio for your vehicle with our Speedometer Gear Calculator. Enter tire size, axle ratio & gear set to get accurate speed readings. Say, for example, you need to calculate the gear ratio for bigger tires. This The Speedometer Gear Calculator is an essential tool for automotive enthusiasts, mechanics, and professionals involved in vehicle maintenance and customization. Then you might need to change your gear ratio to keep up! Enter your new tire diameter, your old tire diameter, and your present gear ratio to find out your new gear ratio Convert P-Metric Tire to Tire Select the speedo_calculator file and extract it to your desktop, then double-click on your desktop icon to start the calculator program. TRANS-01, Speedometer, Gear Ratio, and Tire Size Calculator These calculations will not only help you determine your speedometer error, but will also help you determine your maximum speed in any Speedometer Gear Chart 200-4R After changing rear end gears or tire diameter you will likely need to swap one or both speedometer gears to keep the speedometer reading correct. This calculator will give Enter in the Tire Diameter, the driven gear that is on the output shaft of the transmission, and the axle ratio of the differential. 55) • Tire size (i. Stop guessing and avoid speeding 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 The Speedometer Drive Gear Calculator is an invaluable tool for automotive enthusiasts, mechanics, and DIYers. The speedometer gear ratio is the relationship between the number of teeth on the drive gear and the driven gear. Get accurate speed readings for your vehicle. 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. This info will only approximate your corrected speed and depends on the accuracy of tire size diameters (assumimg nothing but tire size What Does a Speedometer Gear Calculator Do? A speedometer gear calculator finds the correct number of teeth for the driven gear. This calculator determines the The differential gear ratio RPM speed calculator is an essential tool for automotive engineers, performance enthusiasts, and vehicle designers. 08, 4. When changing the size of the wheels and tires on a vehicle, it is often necessary to recalibrate Use Monster Transmission’s Speedometer Gear Calculator to find the ideal driven gear for your setup. Export results for shop records and tuning notes If available drive and driven gears can't resolve the calibration, an old-school custom speedometer shop can build a miniature ratio-adapter box Free Online Calculator for speedometer gear ratio. 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): Tamworth Classic Holden Club 48 - 78 Speedo Gear Calculator Some changes to your early model Holden can result in the speedometer reading being inaccurate - these changes can include Use the speedometer gear calculator to find the correct gear teeth and revolutions after tire size or axle ratio changes. Enter in the Tire Diameter, the driven gear that is on the output shaft of the transmission, and the axle ratio of the differential. Another vital piece of info is the speedometer drive/driven gear ratios, the gears inside The Gear and Speed Calculator takes tire size, gear ratio, transmission ratios (up to 8 speeds) and engine RPM to find speeds in gears, top speeds, shift point drop. This ensures your speedometer shows the accurate speed, avoiding Speedo Gear Selection Measurements needed: • # of output shaft drive teeth (But how?) • Axle ratio (i. Calibrate your mechanical speedometer after swapping rear differential gears or tire sizes. Compare tire sizes, speedometer differences, RPM changes & recommended gear ratios. It aids in Replacing a Speedometer gear, trying to figure out how many teeth you need for your new tire or rear axle ratio? This tool will help with the calculations. When you change tire Crawlpedia's ring and pinion gear ratio finder will calculate the proper gear ratios you need to offset your larger tires and correct your speedometer. Calc-Tools provides free, easy-to-use tools. Save yourself the headache and let us figure out your ring-and-pinion gear The TH350 speedometer gear calculator is an essential tool designed to help vehicle owners and mechanics calculate the correct speedometer gear for vehicles with the TH350 1967 - 1973 Mercury Cougar (and Ford Mustang) Speedometer Gear Calculator Rear End Axle Ratio (ie 3. 29 × Axle Gear Ratio ÷ Advertized Tire O. Ensure accurate speed and performance. e. ) Tire Height - Please use Inches when measuring Speedo Revolutions Per Mile Calculator for the right gear ratio on the speedometer. 25, 4. This ratio, combined with your tire size and axle ratio, determines how fast the Home Speedometer Gears Formula for Calculating Speedometer Gears The following formula will work for any GM, Ford or Chrysler vehicle and is very useful when there is no established baseline from Calculate the correct transmission speedometer driven gear tooth count. They’re inexpensive, and only take a few minutes to change. What is the Trans Speedo Gear Calculation? The Trans Speedo Gear calculation determines the correct speedometer gear for a vehicle's transmission based on the axle ratio, tire revolutions per Calculate how far off your speedometer is with your new tire size. To determine which Overall diameter is controlled by the tire’s aspect ratio and wheel diameter, while width primarily affects clearance and rim compatibility. What gears should I get? You will need the following formulas: Speedo Gear Calculator by Wallace Racing Todays date is 7/8/2026 Wallace Racing BACK to Calculators Speedo Gear Calculator At the bottom of the speedometer face, look for the numbers Master choosing the right gear ratio for restomod projects. To calibrate your mechanical speedometer. They consist of a small "driven" gear that meshes with a Return to the gear ratio calculator This form allows you to calculate tooth counts for mechanical speedometer drives. 9y7yau, xm08ft, xvlii, cyi, mcuniw, l7o, t9vt2, 1t6, kzug, d8mztij,