Speedometer Gear Calculator, Depends on the accuracy of tire size diameters. It is assumed that the Jeep has the stock speedometer Shop mechanical speedometer gears from American Powertrain to complete your TREMEC conversion. I'm running 245/60R15 tires and 3. com's Speedometer Gear Calculator to quickly calculate your vehicle’s gear ratios, speed, and performance. Restore accurate speed readings easily. To determine which The Speedometer Gear Calculator is designed for automotive enthusiasts and mechanics who have changed their vehicle's tire size or rear axle gear ratio. Speedometer calibration made easy. Calculate how sprocket changes affect your top speed or find the perfect sprocket size to reach your desired speed. Calculate how far off your speedometer is with your new tire size. Use the speedometer gear calculator to find the correct gear teeth and revolutions after tire size or axle ratio changes. For a transmission speedometer calibration (the old driven-gear kind in a manual Ford or Jeep), the same math applies: new driven TREMEC Toolbox Vehicle Speed Calculator Instructions Use this calculator to determine your vehicle’s speed in any gear and any engine RPM for best performance. Machine Description: Primary Gear Reduction Ratio: 1st Gear Ratio: 2nd Gear Ratio: 3rd Gear Ratio: 4th Gear Ratio: 5th Gear Ratio: 6th Gear Ratio: Front Sprocket Tooth Count: Rear Sprocket Tooth 1. This calculator helps you choose the correct speedometer driven gear to keep your gauge accurate. 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. Use our gear ratio calculator to find the correct gear ratio to run when changing tire sizes to keep your stock gearing. It uses four main inputs: Drive gear tooth count Axle Speedo Revs/mile = (20168 x DiffGear x DriveGearTeeth) divided by (Tire-diameter x Driven-GearTeeth) Speedometer Calibration How to determine what transmission speedometer gear 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 The two gears are available in a variety of helix (spiral direction) and "number of teeth" configurations to produce reasonably accurate speedometer readings TCI Auto Speedometer Gear Calculator - TCI® Auto Use this TCI Auto Speedometer Gear Calculator Formula for any GM, Ford or Chrysler vehicle. Browse tires by size, vehicle, or brand and compare prices online all in one place. Solve for New Tire Diameter. Calculate gear ratio speedometer correction instantly. The Speedometer Drive Gear Calculator is an invaluable tool for automotive enthusiasts, mechanics, and DIYers. These changes often lead to an inaccurate 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 Speedometer gears are crucial components located inside the rear of your transmission. it is also dripping fluid. This The estimated speed you will be traveling based on the parameters you established and the transmission you selected. The speedometer gear calculator mode handles this flip automatically. Then take your car Select from compared gear sets (below) to re-enter ratios and re-calculate. It is the same diameter as a 1. 3. Solve for Original Speedometer MPH. Then take your car Get the right speedometer gear for your 1979-98 Mustang based off of rear gear ratio & tire size! No guessing with this Mustang Speedometer Gear Changing your tire size affects your vehicle’s speedometer accuracy. This ratio, combined with your tire size and axle ratio, determines how fast the Speedometer Pinion - tooth speedometer pinion required Overall Gear Ratios Use the speedometer gear calculator to find the correct gear teeth and revolutions after tire size or axle ratio changes. The site that I used:http://www. GM Speedometer Gear Calculator helps users determine the correct gear settings for their vehicle’s 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. This The Colorado Sportbike Club Speed Calculator Determine your motorcycle's speed in a specific gear at a certain RPM Thinking about changing your sprocket gearing but wondering how it's going to affect Tire Size Speedometer Accuracy Calculator Calculate the change in speedometer accuracy when tire sizes are changed with this online calculator. Compare correction factors for accurate calibration and shop records. Solve for New Calculate your cruising or top end speed and RPM based on rear gear ratio and tire size with a TREMEC manual overdrive transmission To determine your speedometer error, simply calculate several "theoretical" speeds at different Engine RPMs in the same gear. Use these calculators to determine if your speedo will need to be recalibrated, or to determine the calibration figure to be inputted in to one of our electronic 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. Built‑in P‑metric converter. Use RPMs that are easily readable on your tachometer. This method is purely GUESSWORKS is a Registered Trademark, VAT Reg: 986103604 Guessworks Terms and Conditions relating to products and information. If your cable or speedometer locks up, the clip breaks, and the gear becomes dislodged; this requires transmission removal and partial disassembly. Swapping axle gears or tire sizes alters the relationship between driveshaft speed and vehicle speed. This is very useful when there is no Speedo Gears How to calculate and install When you change your tyres from stock or your gearing then your Speedo will be wrong and should be changed to stop The calculator that I developed (Speedometer Gear Calculator | Mustang 428 Cobra Jet Registry) doesn't have an option for a 7-tooth drive gear because those were never used on the I was messing around figuring out what speedometer gear I needed in my truck when I do the swap and decided to build a calculator for it. 55) • Tire size (i. While I was doing that, I updated my main gear The calculator that I developed (Speedometer Gear Calculator | Mustang 428 Cobra Jet Registry) doesn't have an option for a 7-tooth drive gear because those were never used on the I was messing around figuring out what speedometer gear I needed in my truck when I do the swap and decided to build a calculator for it. What gears should I get? You will need the following formulas: 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. 4dr Belair I just Online Calculators > Automotive Calculators > Speedometer Calculator Speedometer Calculator The Speedometer Calculator helps you determine your vehicle’s speed based on tire diameter, RPM, and 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 Professional gear ratio calculator with speed, RPM, tire size calculations, and multi-gear analysis. 84-inch Adjust RPM & Gear Help on: Change RPM and Gear in sprocket combinations matrix Resulting RPM Default speed Help on: Calculate RPM per gear at 50 Mph or Km/h in all 3 setups Free motorcycle gear ratio calculator. Perfect for car enthusiasts, mechanics, and engineers. Use our speedometer calibration calculator to compare how fast you are traveling and your speedometer reading. SPEEDOMETER GEAR CALCULATOR Speedometer Gear Calibrator Gearing Calculator Check to see how far off your speedometer is with your new different size tires. To fix the issue, different speedo gears are available. About the Speedometer Gear Calculator Swapping axle gears or tire sizes alters the relationship between driveshaft speed and vehicle speed. Always recheck the speedometer calibration! You can either enter your radial tire dimensions or actual How to calculate speedometer driven gear for correct MPH. Read Before Installation Thank you for shopping for the JEGS Speedometer Drive and Driven gears. 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. Calculate the right speedometer driven gear tooth count after changing tire size or axle ratio, and estimate speedometer error. The TH350 speedometer gear calculator is an essential tool designed to help vehicle owners and mechanics calculate the correct This calculator provides the necessary information needed in order to determine what transmission speedometer gear is needed in order to properly calibrate a speedometer. My speedometer is about 20 miles per hour off. Check axle swaps, drive teeth, and readings. A vehicle uses the speedometer drive Calculate the correct speedometer gear size for your vehicle. Solve for Original Tire Diameter. What gear should I use? I have a 700r4 with what I am pretty sure is a 355 rear gear. Speedo Gear Calculator by Wallace Racing Todays date is 5/27/2026 Wallace Racing BACK to Calculators Speedo Gear Calculator At the bottom of the speedometer face, look for the numbers 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. Determine drive and driven gear teeth based on tire diameter, axle ratio, and gear specifications for accurate speedometer readings. Use this free Speedometer Calibration Calculator to instantly see how fast Changing your tire size affects your vehicle’s speedometer accuracy. 225/60R16) The calculators on this This will calculate the speedometer driven gear needed to properly calibrate your speedometer. 25 rear gears behind a wide ratio trans. # teeth in Driven Gear = (Drive Gear Teeth# X Axle Ratio X (20168 / Tire Diameter))/1001 This formula works for Chevy, Ford and Chrysler because speedometer cable This program provides the necessary information needed in order to determine what transmission speedometer gear is needed in order to properly calibrate a speedometer. 00 gear ratio, and you've What does a gear ratio speedometer calculator do? It estimates how axle ratio and tire diameter changes affect speedometer accuracy, road speed, RPM behavior, and correction requirements. This is very useful when there is no Select the speedo_calculator file and extract it to your desktop, then double-click on your desktop icon to start the calculator program. Gear Calculator. During the build, we needed to work out what speedometer gear I should use. A gear ratio speed calculator is a free automotive tool that determines vehicle speed based on engine RPM, transmission gear ratio, final drive ratio, The 700R4 Speedometer Gear Calculator determine the appropriate gear ratio needed for accurate speedometer readings in vehicles. 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 Speedometer Gear Calculator Enter your tire size Tire diameter may vary slightly depending on the manufacturer. Using the Classic Mini The speedometer accuracy is maintained by selecting the correct size driven gear fitted to the gearbox end of the speedo cable - each gearbox has a number of different sized (and colour coded) gear TREMEC GEAR CALCULATOR: Use the Speed Calculator below to compare TREMEC to your current transmission. This is very useful when there is no established baseline from which to work from such as replacing a Find the correct speedometer driven gear size with our speedometer gear recalibration calculator, plus learn the formulas to calculate it. This program provides the necessary information needed in order to determine what transmission speedometer gear is needed in order to properly calibrate a speedometer. com/tc/speedometer-gear-calculator/ 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): The T5 Speedometer Gear Calculator helps you determine the correct speedometer gear for your T5 transmission. Request yours to be added as well. The speedometer gear ratio is the relationship between the number of teeth on the drive gear and the driven gear. In this video Paul covers how to determine how many teeth are on a Calculate the correct speedometer driven gear tooth count for mechanical speedometers after changing tire size or axle ratio. Choose the right gear size for your classic muscle car today! TBI SPEED CALCULATOR I created this page to help customers with gear selection. 1967 - 1973 Mercury Cougar (and Ford Mustang) Speedometer Gear Calculator 1967 - 1973 Mercury Cougar (and Ford Mustang) Speedometer Gear Calculator The Ultimate TYRE, TRANSFER Case & DIFF CALCULATOR for calculating WHEEL speeds at both LOW and HIGH range in all your gears. Determining the precise speedometer drive gear/driven gear combination required for a rear axle ratio change is surprisingly easy-if you know the existing Motorcycle speed and sprocket calculator with bike database for gearing, sprockets, tires and chains of over 1900 bikes. This method is purely Speedometer Calibration Calculator And Information, Palm Springs, Cathedral City, Palm Desert, La Quinta, Desert Hot Springs, Indio, Thermal, Thousand Palms, Rancho 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 Picking the wrong gear ratio means your engine is either screaming at highway speed or lugging through corners — both cost you performance and Calculate vehicle speed in MPH and km/h from engine RPM, tire diameter, rear gear ratio, and transmission gear ratio. Determine drive and driven gear teeth based on tire diameter, axle ratio, and gear specifications. Home > Calibrate Speedometer for New Rear-End Gears Calibrate Speedometer for New Rear-End Gears Q: How to I calibrate my speedometer for new rear-end gears? A: Determining the precise Calculate GEAR, RPM, MPH, TIRE DIAMETER Not to be used in place of real testing. These changes often lead to an inaccurate 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 Then we show you how to obtain your tire revolutions per mile and then plug all those numbers into a simple formula to select the correct driven gear for your speedometer. Select the speedo_calculator file and extract it to your desktop, then double-click on your desktop icon to start the calculator program. This info will only approximate your corrected speed and depends on the accuracy of tire size diameters (assumimg nothing but tire size How To Calculate Speedometer Gear For Fox Body & SN95 Mustang Late Model Restoration (LMR) 195K subscribers Subscribed Calculate speedometer error when installing new tires on your vehicle. Please read this guide to determine which gears are best suited for your application. Learn how to calibrate your speedometer when adding larger tires. This calculator determines potential speed, gear ratio and the size of the drive The Mustang Speedometer Gear Calculator is a highly specialized tool designed for Ford Mustang enthusiasts, mechanics, and owners. Compare tire sizes, speedometer differences, RPM changes & recommended gear ratios. Save yourself the headache and let us figure out your ring-and-pinion gear Gear Ration Speed Calculator (MPH) calculator for go karts, mini bikes and more. Use this TCI Auto Speedometer Gear Calculator Formula for any GM, Ford or Chrysler vehicle. tciauto. The Calculation is based on knowing the number of revolutions Use CalcsHub. This method is purely 1967 - 1973 Mercury Cougar (and Ford Mustang) Speedometer Gear Calculator Enter gear ratios, primary ratio, sprocket sizes and tire diameter, then drag RPM slider to calculate speed from RPM. Enter tire size, axle ratio & gear set to get accurate speed readings. Swapping in a different gear set? This is more than likely going to throw off your speedometer. I often see a number of requests for information on speedometer errors and corrections after differential gearing or tire size changes. The speedometer gear calculator assists you in calculating the size of the gear you need for your vehicle's speedometer. They consist of a small "driven" gear that meshes with a Our free Speedometer Driven Gear Recalibration Calculator helps you determine the exact driven gear teeth needed when upgrading tire sizes or changing axle Discover the best speedometer gear ratio for your vehicle with our Speedometer Gear Calculator. The Speedometer Gear Calculator is designed for automotive enthusiasts and mechanics who have changed their vehicle's tire size or rear axle gear ratio. Use this handy calculator to find out the speedo gear you should Calculate your vehicles speed & gear ratios with our advanced but easy to use calculator. One of the perennial questions is "What gears do I need to use to get the speedo to read correctly?" "It depends" is the best answer as there are several variables Measure your engine’s RPM based on the ring gear and pinion gear ratio, speed, and tire height, with the Spicer Engine RPM Calculator. Drag Max RPM slider to adjust the range of the RPM and Speedometer Gauges. Free calculator with preset Speedometer Gear Calculator Input your tire diameter, axle ratio, and transmission drive gear to find the correct driven gear and ensure accurate speedometer readings. This calculator helps you determine Monster Speedometer Gear Calculator Calculate the correct speedometer driven gear based on tire size, axle ratio, and drive gear. This calculator helps users Speedo Revs/mile = (20168 x DiffGear x DriveGearTeeth) divided by (Tire-diameter x Driven-GearTeeth) Speedometer Calibration How to determine what transmission speedometer gear The TCI Speedometer Gear Calculator is a valuable tool used in automotive applications to determine the number of teeth required on the Return to the gear ratio calculator This form allows you to calculate tooth counts for mechanical speedometer drives. The speedometer head expects a fixed number of cable revolutions per mile. Free speedometer calibration calculator for mechanical speedometers. This calculator helps users Speedo Revs/mile = (20168 x DiffGear x DriveGearTeeth) divided by (Tire-diameter x Driven-GearTeeth) Speedometer Calibration How to determine what transmission speedometer gear The Speedometer Drive Gear Calculator is an invaluable tool for automotive enthusiasts, mechanics, and DIYers. Calculate the correct speedometer gear size for your vehicle. If in doubt use manufactures posted diameter. This calculator helps you choose the correct Speedo Gear Selection Measurements needed: • # of output shaft drive teeth (But how?) • Axle ratio (i. Explore TCI Auto's speedometer gears designed for high-performance automatic transmissions, ensuring accurate speed readings and optimal vehicle performance. Pick Your Drivenman Transmission Enter your desired RPM for racing or cruising Enter View helpful calculators for Tire Size vs Transmission, Differential, RPM, and Speed/gear and Transmission, Differential, and RPM at Modern Driveline. For a passenger vehicle, the tire size can be found Easy to use gear ratio calculator. Here's a good write-up including charts and a calculator Ring & pinion gear ratio Tire height (in. Here is a list of common transmissions with their drive and driven gear teeth numbers Our free Speedometer Driven Gear Recalibration Calculator helps you determine the exact driven gear teeth needed when upgrading tire sizes or changing axle Use the speedometer gear calculator to find the correct gear teeth and revolutions after tire size or axle ratio changes. Free tire size calculator with gear ratio analysis. determine what speedometer gears are needed for the transmission when using a mechanical speedometer An LMR speedometer gear calculator helps match the cable driven speedometer to tire size and rear axle ratio. Speedometer Driven Gear Calculator at The Definitive 1967 - 1973 Mercury Cougar Parts Source Speedometer Driven Gear Calculator for 1967 - 1973 Mercury Cougars and Fords Mustangs Speedometer Gear Applet This calculator determines the proper speedometer driven gear based on Jeep model, tire size, and ring and pinion. Then we show you how to obtain your tire revolutions per mile and then plug all those numbers into a simple formula to select the correct driven gear for your speedometer. TCI Auto Technical Resources The following collection of technical information should provide a basic understanding of everything from learning ATF fluid capacities to Gear Ratio Calculations. It aids in Calculator Instructions This calculator provides the necessary information needed in order to determine what transmission speedometer gear is needed in order to A Speedometer Gear Calculator is a tool used by automobile enthusiasts, mechanics, and professionals to ensure the accuracy of a vehicle’s Use our tire size tools to calculate specs, speed, gear ratios and more. 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 Home Speedometer Gears Formula for Calculating Speedometer Gears The following formula will work for any GM, Ford or Chrysler vehicle and is very What Does a Speedometer Gear Calculator Do? A speedometer gear calculator finds the correct number of teeth for the driven gear. Gear Ratio Calculator Use our simple Gear Ratio Calculator to quickly find the correct gear ratio for your ring and pinion gear set. Use this free Speedometer Calibration Calculator to instantly see how fast 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. BETA RELEASE send any comments or suggestions to the email address To determine your speedometer error, simply calculate several "theoretical" speeds at different Engine RPMs in the same gear. Click the Picture to give SpeedoCalc a try Calculate correct speedometer gear for tire and axle changes. SPEEDOMETER GEAR CALCULATOR Speedometer Gear Calibrator Select the speedo_calculator file and extract it to your desktop, then double-click on your desktop icon to start the calculator program. Estimate speedometer gearing with tire changes quickly. For assistance Our online speedometer gear calculator tool is the best to find the number of driven teeth easily in seconds and is also provided with formulas, and steps. Ensure accurate speed and performance. determine what speedometer gears are needed for the transmission when using a mechanical speedometer Calculate your vehicles speed & gear ratios with our advanced but easy to use calculator. Speedometer Gear Calculator A simple to use Transmission Speedometer Gear Calculator. Supports P-metric & Speedometer Gear Calculator Trying to figure out the right Speedometer Gear? SpeedoCalc Can help with that task. . Click dropdown to select, then use keyboard cursor keys to step through gear sets Calculate the right speedometer driven gear tooth count after changing tire size or axle ratio, and estimate speedometer error. Machine Description: Primary Gear Reduction Ratio: 1st Gear Ratio: 2nd Gear Ratio: 3rd Gear Ratio: 4th Gear Ratio: 5th Gear Ratio: 6th Gear Ratio: Front Sprocket Tooth Count: Rear Sprocket Tooth If you change tire size or rear-end gear ratio, your speed and odometer will be off. This will only be approximate of your corrected speed. While I was doing that, I updated my main gear Is there an easy way to figure out what speedometer gear I need? I've changed tire size and rear end gearing. SPEEDOMETER CHECK CALCULATOR Speedometer check calculator. 1. e. The speedometer accuracy is maintained by selecting the correct size driven gear fitted to the gearbox end of the speedo cable - each gearbox has a number of The transmission calculator helps you quickly determine vehicle speed, RPM, and the right transmission and differential gear ratios. The Speedometer Gear Calculator is an essential tool for automotive enthusiasts, mechanics, and professionals involved in vehicle maintenance and customization. (too fast). Perfect for automotive enthusiasts, mechanics, and engineers. 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 Introduction A Speedometer Gear Calculator is an essential tool for vehicle enthusiasts, mechanics, and anyone looking to accurately measure the speed of their vehicle. Speedo Gear Calculator by Wallace Racing Todays date is 4/23/2026 Wallace Racing BACK to Calculators Speedo Gear Calculator At the bottom of the speedometer face, look for the numbers Determining the precise speedometer drive gear/driven gear combination required for a rear axle ratio change is surprisingly easy-if you know the existing Motorcycle speed and sprocket calculator with bike database for gearing, sprockets, tires and chains of over 1900 bikes. This page provides a simple formula to aid in selecting the proper speedometer gears for your transmission application and charts showing the various gears available for each transmission. ) Engine RPM Transmission gear ratio 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 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 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. Doesn’t matter how much power your motor makes if you have poor gearing where that engine isn’t in its powerband If the ring and pinion and/or tire size has changed on your Jeep vehicle, then you will want to replace the factory speedometer gear with the TCI Auto Speedometer Gear Calculator - TCI® Auto Use this TCI Auto Speedometer Gear Calculator Formula for any GM, Ford or Chrysler vehicle. SPEEDOMETER GEAR CALCULATOR Speedometer Gear Calibrator 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 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. Todays date is 5/21/2026 Gearing Calculator Ever wonder how far off your speedometer is with your new bigger tires? This info will only approximate your corrected speed and depends on the accuracy Todays date is 5/21/2026 Gearing Calculator Ever wonder how far off your speedometer is with your new bigger tires? This info will only approximate your corrected speed and depends on the accuracy What you probably should do first is to remove the speedometer cable from the transmission, count the teeth on the driven gear and apply this formula; We'll assume you had a 3. com/tc/speedometer-gear-calculator/ How to calculate speedometer driven gear for correct MPH. Works for motorcycles and mopeds.
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