# Gear Ratios Calculator

Includes chart. If you have ever wondered what the gear ratio is in your rear-wheel drive vehicle and. Using Gear Ratio to Calculate Speed If you know the rotational speed of the driver wheel, which is usually measured in revolutions per minute (rpm), the gear ratio tells you the speed of the driven wheel. Calculate your Rear End Gear Ratio Needed. The number of teeth of the planets has no effect on the ratio. Determine RPM: Use this calculator when you know your gearing and want to find your RPM at a given speed. Gear ratio is determined by tooth count on second gear. They look cool and have the potential of being very functional, but they may also be robbing you of power/gas mileage. A good way to calculate this is to multiply. Gearsets are interchangeable among several different housings. Hotrod MD Category: Transmission. Gear Ratio Calculator. I have included some primary drives kits by Malossi and Polini. Electronic gear ratio is used to enlarge or reduce the pulse frequency obtained from a high-level controller. Classic BMX gearing evolved over the years to be 44/16,which has 55 gear inches. Nothing else to download and install. 12 X 38" = 4. Use this gear ratio calculator to see what ring & pinion gear ratio will be right for you after a tire size change. Guessworks Gearbox & Speedo Ratio Calculator. Speed versus RPM Calculator. These calculators are designed to give the approximate engine RPM (revolutions per minute) based on the ring gear and pinion gear ratio, the height of the tires (diameter from ground to top of the tire while mounted on the vehicle) and the transmission final gear ratio. If you haven’t already become best friends with it, you may need to start! Gear ratios on touring bikes depend on a number of factors: where you plan to travel, the terrain, your experience, how strong you are as a rider and, of […]. Enter the tire size diameter and the target vehicle speed in MPH. eCart 3D GEAR DESIGN. Instructions. Using the correct auto ratios with 3. Probably the most important of the three variables required to calculate the gear ratio is engine RPM. Use this calculator to determine your gear ratio and vehicle's speed in any gear and any engine RPM for best performance. Screwcutting Gear Ratio Calculator - About. The gear ratio is the ratio of the number of turns the output shaft makes when the input shaft turns once. This may be a bit inaccurate for CVT driven scooters. As an example, a newer Corvette Z06 has a first gear final drive ratio of 2. Although I'm not familiar with watch gear trains specifically, calculating the entire systems gear ratio is quite easy. Planetary Epicyclic Gear Ratios Equations and Calculators. It's equivalent to the M20 muncie with a 5. Introduction to Gear System 1 Basic in Gear Ratio 3 Exercises with Gear Ratio 4 Gear Ratios Word Problems 6 Exercises with Gears Ratio & RPM (Inverse Proportion) 7 Exercises on RPM and Distance Traveled 9 Experiment 10 Compound Gear System 12 Exercises 13 Wheels Diameter vs. I wanted to get the right gears for my rear axle to accommodate the size change. Gear Ratio Calculator Step 1 : Select transmission from the drop down list or, if it's not in the list and you know the gear ratios of your transmission, enter them below. Includes derailleur gears and internal gear hubs. The ratio is only calculated from the first gear, the driving gear which is attached to the power source, and the last gear in the chain. Maybe the following example will help you make sense of this. When most people talk about a marine gear ratio, they mean the reduction ratio of the motor that expresses the number of times the motor turns--the number of revolutions--to turn the propeller once. Optimal Gear Ratio Calculator v2 by: Ari423 Calculator to help choose motors and gear ratios for mechanisms based on their desired characteristics. 00) and the tire diameter, ground to top of tire as mounted. 5-inch-tall tire with 4. 467 for gear #14. Type or select your answer, then press "Check". 414 is a rounded figure. Gear Ratio Calculator. 3+ is green, 2-3, blue, and below 2, red. Engine RPM at Cruise Speed Example: If you want to Cruise at 60 MPH at 2000 RPM and your Tire Diameteris 30", the Gear Ratioyou need is a 3. I know how to work out the ratio, for 1 set of gears 2. 00 with a 4:86 and see if it turns the driveshaft. EndTuning - A simple calculator to work out what road speed you will achieve at a given RPM, or calculate your RPMs from a given road speed. Gear Ratio Calculator. This will be able to demonstrate increases with In-Gear speeds for increase RPM limiters. 1 - This is a retrofit gear to allow the speedometer to function with 3. The defaults show suggested values. Ring Teeth. Classic BMX gearing evolved over the years to be 44/16,which has 55 gear inches. Use this gear ratio calculator to select the best ring & pinion and gear ratio combinations to serve your needs. Using the correct auto ratios with 3. This is Single Speed Gearing 101. Change Sprockets - Change Speed. Revolution / Revolution or Speed Ratio Multiplier of the Driver to the Follower. Enter Shift at RPM, select gear to shift to and hit Auto Shift to run up through the gears recording shift point RPM and MPH. 38 (07-11) or 5. We use Sprocket Specialists for many of our sprockets and since we raced bikes at the Bol D'Or in 1977. Enter the tire size diameter and the target vehicle speed in MPH. Gear Ratio Speed Calculator By David Nguyen Calculate theoretical speed for a car in each of its gear ratios. Simply enter the number of teeth on your ring gear and pinion gear and click the "Solve" button. Weddle Industries has recently added two new overdrive ratios to their extensive lineup of high performance 091 and 094 Vanagon gears. Morning all, I really hope someone can steer me on this one! I'm looking to create / understand / find a formula that will allow me to understand how gear ratios / final drive / rpm / mph all fit. This calculator will provide the speed of the vehicle based on the transmission gear ratio, the engine RPM, the tire height, and the ring gear and pinion gear ratio in the rear end axle differential housing. In other words, the Gear ratio is the ratio between the number of teeth on two gears that are meshed together, or two sprockets connected with a common roller chain, or the circumferences of two pulleys connected with a drive belt. 56 is a good manual final axle ratio, and 5. Let's say it's 42. We have included this amazing tool to help you calculate the gear ratios on your motorcycle, RPM Vs. The input gear in this gear train has 13 teeth and the idler gear has 21 teeth. As such, anything involving gear ratios will be strictly a programming issue, so there's nothing Unity-specific that you'll need to worry about there. A Word About Gear Ratios. If a car has less than 6 speeds, only enter numbers for the ratios that apply (i. The value will be returned in estimated differential gear ratio, based on the entered values. 12 by your Jeeps tire diameter (Example:. RPM/MPH From Gear Ratio Calculator - by Wallace Racing Home of Pontiac Powered Firebirds,Trans Ams,Pontiac Powered Dragsters,Pontiac Power Rules!. Paralever Airheads have either the 3. I use some handy charts to help determine your perfect ratio for the drag strip or Maxton etc. This calculation is used to match oversize tires with new ring and pinion gears to obtain the desired engine RPM at highway speed. 80 for the manual You know the ring gear and pinion gear ratio. Enter the values below to calculate your gear ratio. Please select ratio type from the drop down menu below: TEETH: RATIO:. Solve for your Differential Ratio. Gear Ratio Calculator. Display as chart or tabulated text Teeth on chainrings (front): largest: and smallest: Teeth on cogs (rear): largest: and smallest: Units below are centimeters or inches. When most people talk about a marine gear ratio, they mean the reduction ratio of the motor that expresses the number of times the motor turns--the number of revolutions--to turn the propeller once. There is more to the gearing on a bike than simply the size of the big ring. how many revolutions per minute you turn the pedals. E-Z-GO RXV Electric 13. 5 INCHES = D 2 D 2 = 6. See ratios below and updated link to the 2nd gear calculator with the auto ratios plugged in. Simply put, your gear ratio compares the number of teeth in your front chainring to the number of teeth in your rear chainring. Different versions of the transaxle are available, depending upon application. for the lowest gear. This calculator determines the top speed of the vehicle with no margin for mechanical, rolling, or wind resistance. how many revolutions per minute you turn the pedals. Number of teeths on a gear is usually proportional to the radius of gear pitch circle. Work out the aspect ratio of a 5296x1050 resolution, so that I am able to create a custom HUD layout that automaticly centers on the screen for tripple screen gaming. 38's without using custom axles under the. 8 inch tires Manual Transmission Gear ratio of 3. One of the most common pieces of Mustang advice is to sway the gear ratio (axle ratio) in the differential. This calculator assumes you know the vehicle's transmission ratio. 11 gears and 4. The analogy to automobile rear axle ratios is not a good comparison. In other words, the Gear ratio is the ratio between the number of teeth on two gears that are meshed together, or two sprockets connected with a common roller chain, or the circumferences of two pulleys connected with a drive belt. Keep in mind that our calculator does NOT take into account drive train loss, road and weather conditions, or the. 6-to-1 or whatever (depending upon gears). Inseparably linked to choosing gear ratios is the concept of cadence i. The gear ratio is therefore 2:1 (pronounced "two to one"). 10 final gear ratio x 336) / 30-inch diameter. Gears can be animated with various speed to demonstrate working mechanism. so put a gear set in that should be say a 6. That data consists of the ring gear and pinion gear ratio, the height of the tires (diameter from ground to top of the tire while mounted on the vehicle) and the transmission final gear ratio. 00) and the tire diameter, ground to top of tire as mounted. This calculator is fairly new and still in testing, graphing times may be up to 8 seconds. If you have ever wondered what the gear ratio is in your rear-wheel drive vehicle and. Access Optimum Transmission Gear Ratios Calculator RICHMOND is the leading manufacturer of professional quality, hi-performance ring and pinion sets. 38 (07-11) or 5. How to Calculate Ratios. Requires an HTML 5-compliant browser. 10:1, unless 27 inch or larger tires are installed. Now that you have your truck lifted they look cool and have the potential of being very functional, but they may also be robbing you of power/gas mileage. The rear axle gear ratio is the number of turns that the input of the differential at the driveshaft makes in relation to its output at the rear wheels. Gear Ratio and Tire Size Calculator - 4x4 and Jeep Ring & Pinion When you change your tire size you need to make sure you have the right gearing to get optimal fuel economy and power. See effect on (Top-)speed in Gear/RPM matrix. RPM/MPH From Gear Ratio Calculator - by Wallace Racing Home of Pontiac Powered Firebirds,Trans Ams,Pontiac Powered Dragsters,Pontiac Power Rules!. on my helicopter. If you would like to find a value other than speed, fill in information for all the boxes and clear the valu in box you would like an answer for. A calculator for designing a multi–stage compound gear train. Gear-Speed Calculator for Dodge 2500/3500 with Cummins Turbo Diesel Axle Ratio 3. Fast way to determine Gear Ratio and Speed. This calculator is for entertainment value only. Gear Ratio Calculator. Gear Ratio Calculator. Tire Size (diameter) 2. com - Bicycle Gear Ratio Chart I was searching for it because I wanted to find a cheaper way to max my gear range % without paying $1000 for a SRAM Eagle setup. Input your stock and new tires sizes along with your original gear ratio. Table 3 shows a procedure to improve and calculate the spur gear geometry for higher contact ratios using values of “k” and negative addendum modification coefficients. History of the Speedo Gear Change Calculator. They can compare absolute quantities and amounts or can be used to compare portions of a larger whole. Gear Ratio Calculator for Vehicle with Jackshaft. Racing Forums. The selection of cassettes is up to date as of February 2018 for Shimano, SRAM, SunRace and recent Campagnolo models. 5 internal drive ratio = 8. Small Frame Gearing Calculator. 3 times for every 360-degree turn of the reel handle. This application calculates gear ratios for the road bike and the MTB. STREET PERFORMANCE CALCULATOR. RPM Calculator. How you can see in the following image:. Rpm: Tire Diameter in inches: (use the diameter of the tire that puts power to the ground). If you do not know this ratio, you can simply put in 1. Gain ratio is distance travelled divided by the circular distance travelled by a pedal. Ratio of the highest gear of your setup. Pick the maximum number, 48 for example. Or, change input variables (engine RPM, axle gear ratio and tire height) to determine vehicle speed in each forward gear. 5:1 range and cruise at a bit higher rpm that the torque converter stall speed in 1:1 gearing, if you have a over drive gear having a lock-up converter sure helps and a. Gear Ratio Calculator. A huge thank you to 1 Wild R/T for suggesting it. how many revolutions per minute you turn the pedals. In the generic form of the formula (above) num1 represents the first number (the antecedent) and num2 represents the second number (the consequent). Gears can be animated with various speed to demonstrate working mechanism. Weddle Industries has recently added two new overdrive ratios to their extensive lineup of high performance 091 and 094 Vanagon gears. Divide the number of teeth on each "driven" gear by the number of teeth on the "drive" gear for each interlocking set of gears to calculate the intermediate gear ratios. I've also read a fair amount of anecdotal misinformation on here too which certainly doesn’t help the OP. Calculate Gear Ratios: This program calculates the gear ratios of a motorcycle. 1750 RPM ÷ 1000 RPM × 3. Gain ratio is distance travelled divided by the circular distance travelled by a pedal. In addition it let you compose full gear layouts with connetcted gears to design multiple gears system with control of the input/output ratio and rotation speed. Bicycle Gearing Calculator - Gear train transmission. Enter Diff + Gear Ratios and tyre diameter, then drag RPM slider to calculate speed from RPM. You're going to have to put the car in nuetral or out of gear, so safety first! Do this on level ground, and be sure and chock the front wheels so the car can't move. Math Made Easy! Easy and simple—that’s how we want your rearend experience to be. ) in Inches. Rpm: Tire Diameter in inches: (use the diameter of the tire that puts power to the ground). Graphical gear calculator for bicycle gearing systems. One way to compensate for this is to swap out your differential gears. Then click on the Calculate button when you are finished. 4-to-1 or 3. What Gear Ratio is My Rearend? You can find your gear ratio easily with this method. This application has its use when you are trying to adjust the setup of the gears with the gear ratios. The driver gear or pulley is the one connected to the power - e. This means the output gear (Gear A) is only moving 1/9 speed of the input gear (Gear D). A calculator for designing a multi-stage compound gear train. We have added the proper transmission ratios and crank ratios for you!. The fact that one gear is spinning twice as fast as the other is because of the ratio between the gears -- the gear ratio. Probably the most important of the three variables required to calculate the gear ratio is engine RPM. A improper gear ratio will make the clutch or belt slip and cause damage to the unit very quickly. This can help you in finding the most suitable gear ratios for your bike, a very important factor if you are building a fixed gear or single speed vehicle. Enter Shift at RPM, select gear to shift to and hit Auto Shift to run up through the gears recording shift point RPM and MPH. If you count up the number of teeth on gear one, and on gear X (the last one) and set them in a ratio (1:X), this is the gear ratio. Ratio of the highest gear of your setup. Determine Speed: Use this calculator when you know your gearing and want to find your Speed at a given RPM. I'm having a really hard time figureing out how to calculate the gear reduction of a gearbox im designing. The value will be returned in estimated differential gear ratio, based on the entered values. If the gear ratio is known it is easy to calculate a theoretical top speed along with propeller efficiency if the actual boat speed has been. Enter Diff + Gear Ratios and tire diameter, then drag RPM slider to calculate speed from RPM. Bigger tires can help you crawl up those slick rocks, look cool, and rob you of power. Output Speed = Input Speed / Ratio of Gear Increaser. My Porsche runs like a scalded ape in first gear and it's overall ratio is 13. 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 Count: Rear Tire Diameter: (inches) [can also use calculator below] Engine RPM Low: Engine RPM Max:. Gear Generator is a tool for creating involute spur gears and download them in DXF or SVG format. Type or select your answer, then press "Check". 50 overdrive set. 56) The below table can be used to get a rough idea on gear ratios. output from the turbine 25 teeth this turns a pulley 25teeth this turns a pulley 22 teeth. This chart is particularly useful when used in conjunction with an engine's power and torque data - showing what the rpm drop is in each gear when shifted at a specific engine rpm. 3:1 means the spool rotates 6. With this calculator, you can solve for any of three variables in the rpm-speed equation. You can play around with it by changing the tires, the transmission top-gear ratio, and the r. Carrier Speed. All are H-series, 3/4" wide belts. Contact us with any questions you may have. If you multiply each member of a ratio by the same number, the ratio remains the same. Skid Patches. Also calculated is the new gearing you would need in order to return back to your original gear ratio when going to a bigger or smaller tire. You're going to have to put the car in nuetral or out of gear, so safety first! Do this on level ground, and be sure and chock the front wheels so the car can't move. Instructions. Using the Gear Ratio Calculator, we specified a 26. Ratios are mathematical expressions that compare two or more numbers. Gear ratio and RPM Calculator: Instructions: Use this calculator to estimate various aspects of your performance. There is more to the gearing on a bike than simply the size of the big ring. 2 Possibility of removing first gear. Since the gear tooth pitch is slightly different than OE, the service life of this gear is limited to less than 25,000 miles. See effect on needed sprocket distance, chain lenght and # links. To determine the gear ratio necessary for your go kart or mini bike you must know the limit of your top speed. First gear ratio of the Th-700R4 is 23% lower than a TH-400 ( 2. The formula to find the gear inches for your bike is simple. RPM/MPH From Gear Ratio Calculator - by Wallace Racing Home of Pontiac Powered Firebirds,Trans Ams,Pontiac Powered Dragsters,Pontiac Power Rules!. Late Model GM Manual Transmission Gear Ratio Chart T-56 Six-Speed (Corvette) Type First Gear Second Gear Third Gear Fourth Gear Fifth Gear Sixth Gear. Gear ratios determine the speed at which a reel picks up line. Obviously, there are other tire/wheel sizes here that I haven't listed however the sizes listed give you. Drag Max RPM slider to adjust the range of the RPM and KPH Gauges. Gear ratio is determined by tooth count on second gear. This calculator will graph RPM vs. If the ring gear is held stationary and the sun gear is used as the input, the planet carrier will be the output. The results will then be: Automatic transmission in Drive; Automatic transmission in Overdrive. See effect on (Top-)speed in Gear/RPM matrix. Spin the tire until the mark on the driveshaft comes back to the starting point. Moving your mouse over the ratio will show speed you will achieve by pedaling at 100 rpm. The numerator of a gear ratio is motor encoder pulse number per revolution; the denominator is the required pulse number, through which high-level controller represents one motor revolution. This will be able to demonstrate increases with In-Gear speeds for increase RPM limiters. See effect on RPM in Gear/Sprocket matrix when changing sprockets. Gear Ratio Calculator. Distance Traveled 16 Examples 16. Learning what gear ratio is and how to calculate for it can help you build a high-performance car. Enter Your Own Numbers Number of forward gears. The fact that one gear is spinning twice as fast as the other is because of the ratio between the gears -- the gear ratio. I'm having a really hard time figureing out how to calculate the gear reduction of a gearbox im designing. Revolution / Revolution or Speed Ratio Multiplier of the Driver to the Follower. Planetary gears turn on a movable center and the sun gears turn on a fixed center. We have included this amazing tool to help you calculate the gear ratios on your motorcycle, RPM Vs. 1 - This is a retrofit gear to allow the speedometer to function with 3. 10 final gear ratio x 336) / 30-inch diameter. To calculate the torque, you just multiply the force by the distance from the center. speed as you go through the gears. 8 and gear efficiency 0. Here is a simple online calculator to find out the gearing ratio related to the accounting and finance. Work out the aspect ratio of a 5296x1050 resolution, so that I am able to create a custom HUD layout that automaticly centers on the screen for tripple screen gaming. Calculate a mile per hour - a "how to" Bottom gear / Top gear = Gear Ratio Example 43/27 = 1. In all three of these example Gear Trains, the Driving Gear is 12-teeth and the Driven Gear is 36-teeth, thus the Gear Ratio for all three examples is the exact same - 12:36. The right side will show the results. Set #2 has a driving pulley with 30 teeth and a driven pulley with 57 teeth. It is important to have the correct gear ratio for the tire size for proper operation of your clutch or torque converter. Motorcycle Sprocket Size/Ratio Calculator Home Explain Calculate Lookup Request This easy online sprocket calculator will help you determine the effect that different sprockets will have on your motorbike and help you calculate the best sprocket sizes for your riding style. Click on Calculate. This calculator does not take into consideration any drive train loss, road. UK Based Performance VW Engine Specialist (est 1983). A huge thank you to 1 Wild R/T for suggesting it. Compare ratios and evaluate as true or false to answer whether ratios or fractions are equivalent. Example: A gear reducer with 1000 in/lbs of input torque, an input. Standard gears are a 18. A improper gear ratio will make the clutch or belt slip and cause damage to the unit very quickly. I am looking for a calculator where you punch in your gear ratios, final drive, tire size, and engine rpm and it calculates how many mph you will be traveling. Gear Ratio Calculator. x and MS Internet Explorer 3. To use our Hurricane Gear Calculator, fill in the fields below with appropriate information. These calculators are designed to give the approximate engine RPM (revolutions per minute) based on data entered. The overall demultiplication of multi stage planetary gear units is calculated by multiplying the ratios of the single stages. I don't think the gear ratio is really a significant factor in choosing an outboard motor. Once you understand how GCD works you can use the function to find your ratios by dividing each of the two numbers by their GCD and separating the answers with a colon “:”. Engine RPM, or the speed at which the engine turns, can be calculated at any speed given the vehicle's tire size, axle ratio, and final transmission gear ratio. Gear image generation code from http://jsbin. I want a better 1st gear ratio - or possibly different 1st and rear gears. Use our simple Gear Ratio Calculator to quickly find the correct gear ratio for your ring and pinion gear set. I find myself looking up gear ratios for Subaru Models a lot, so I figured I'd post it here as a reference for everyone! I got this information on NASIOC posted by the user North Ursalia. This calculation is used to match oversize tires with new ring and pinion gears to obtain the desired engine RPM at highway speed. Using formulas from JVN's Mechanical Design Calculator, I have created a spreadsheet that automatically calculates the optimal gear ratio for a given motor and load. First gear is 2. 50 overdrive set. I'll calculate the best chainring/cog combinations and skid patches for your speed and cadence and what your speed will be at various cadences. fixed to a motor): specify numbers of teeth for red and yellow gear below, then click calculate. Enter the values below to calculate your gear ratio. ~ Power to Weight Ratio Calculator ~ A simple to use Power to Weight Calculator to work out your Brake Horsepower per ton and compare it with some of the more desirable cars on the market. Obviously, there are other tire/wheel sizes here that I haven't listed however the sizes listed give you. TIRE SIZE CHANGE CALCULATOR. This relationship between the tooth ratio and the gear ratio is very important. 8 and gear efficiency 0. They discuss and find slopes as they relate to real life. If you are looking to reduce engine RPM at highway speeds, you now have five different options to choose from:. Hotrod MD Category: Transmission. This gear calculator will get you back to a ratio that's closer to your original. 5:1 range and cruise at a bit higher rpm that the torque converter stall speed in 1:1 gearing, if you have a over drive gear having a lock-up converter sure helps and a. It can also do a reverted gear train. (The faster you go, the closer you want your gear change ratios to be, but that’s another, more complex story. local shops will charge about $350 to$450 per axle. (Note: The calculator converts under the assumption that one unit of the gearbox is fixed (sun, planet carrier and annulus gear), therefore does not rotate). Understanding the. I'll calculate the best chainring/cog combinations and skid patches for your speed and cadence and what your speed will be at various cadences. what is gear ratio & how it can calculate. For example, at 34-tooth chainring and 17-tooth rear cog have a 2:1 gear ratio. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Now that you have your truck lifted they look cool and have the potential of being very functional, but they may also be robbing you of power/gas mileage. Classifieds. 3 times for every 360-degree turn of the reel handle. Your external (primary) gear ratio with such a setup would be 2. Solve for your Crawl Ratio. STREET PERFORMANCE CALCULATOR. Bicycle Gearing Calculator - Gear train transmission. Since everyone seems to have an opinion, I thought I would throw my thoughts in as well. A Word About Gear Ratios. Divide the number of teeth on each "driven" gear by the number of teeth on the "drive" gear for each interlocking set of gears to calculate the intermediate gear ratios. ~ Power to Weight Ratio Calculator ~ A simple to use Power to Weight Calculator to work out your Brake Horsepower per ton and compare it with some of the more desirable cars on the market. Optimal Gear Ratio Calculator by: Ari423 This is a spreadsheet calculator that can be used to determine the optimal gear ratio for a mechanism with a given motor and load. 5 internal drive ratio = 8. What is a gear calculator ? The gear calculator is a comprehensive software which, after inputting various parameters related to gear calculations, computes on-line automatically gear sizes, strengths, working forces, tooth forms, backlash conversions, etc. Then reverse the numbers. We have developed this chart to help you select the optimum gear ratio to put your performance back where you want it. How much will tire size affect gear ratio? (calculator says about a 3. Gear Ratio Calculator: Enter Maximum RPM: Enter Tire Diameter: Enter Targeted MPH: Rear End Gear Ratio Required:1 : Mopar, Dodge, Chrysler, and Plymouth are. In this figure, the diameter of the gear on the left is twice that of the gear on the right. Late Model GM Manual Transmission Gear Ratio Chart T-56 Six-Speed (Corvette) Type First Gear Second Gear Third Gear Fourth Gear Fifth Gear Sixth Gear. Gear Ratio Calculator. Access Optimum Transmission Gear Ratios Calculator RICHMOND is the leading manufacturer of professional quality, hi-performance ring and pinion sets. Circle Track Gear Calculator. FORGED COMPONENTS. Engine RPM divided by total gear ratio, multiplied by the tire diameter and converted for units of measurement, gives vehicle's speed of travel. Ratio Calculator. If a car has less than 6 speeds, only enter numbers for the ratios that apply (i.