Solve for your Transfer Case Ratio. If you want to customize the colors, size, and more to better fit your site, then pricing starts at just $29.99 for a one time purchase. Like magic, we instantly display what cruising RPM your setup will yield or the gear ratio you need to get your rig rollin’ right. For example, if the pinion gear has 41 teeth, and the ring gear has 11 teeth, the ratio would be calculated as 41/11 which = 3.73 so 3.73:1. This form allows you to calculate final drive ratios as well as see a comparison of speeds and RPMs within operating ranges of the vehicle. CALCULATORS. The gear ratio calculator exactly as you see it above is 100% free for you to use. Solve for your RPM. Start by entering your tire diameter in inches or your rigs current gear ratio. Enter your car's internal drive ratio to see the final drive ratio (FDR), and see the percentage change in gearing you'll get from a new pinion and spur. Transmission 1 - MPH | KM/H. This is especially helpful when trying to identify a gearset that needs replacement with the same ratio ring and pinion. Solve for your MPH. This calculator is useful for planning your rig, allowing you to see what kind of performance to expect from different combinations. RICHMOND is the leading manufacturer of professional quality, hi-performance ring and pinion sets. Popular OEM and Aftermarket Gear Ratios. The Gear Ratio Calculator will determine the ratio of a gear set, based on the number of teeth on the ring gear and teeth on the pinion gear. 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. Solve for your Transmission Ratio. eCart GEAR RATIO CALCULATOR. Access Optimum Transmission Gear Ratios Calculator. Solve for your Crawl Ratio. Solve for your Differential Ratio. Gear Ratio Calculation Basics. Your axle gear ratio determines how many times your driveshaft needs to rotate in order to complete one full tire rotation (a 3.73 gear ratio requires 3.73 driveshaft rotations to turn your tires 360 degrees). For example, the default figures in the chart are for a stock ratio transmission as fitted to a Type 1, 1303S (3.88 ring and pinion). GEAR RATIO, TIRE SIZE, CRAWL RATIO, ETC. This calculator can be used to either calculate your gear ratio or your ideal cruising RPM at 65 MPH given a specific gear ratio input. This calc can be used to find any (one) missing value. Use this gear ratio calculator to see what ring & pinion gear ratio will be right for you after a tire size change. Click the "Customize" button above to learn more! Keep in mind that in some applications the gear ratios might not calculate exactly, as is the case with 4.09, 4.10, and 4.11 gears and 4.30 and 4.31 gears. Tire Size: or ... Predefined Gear Ratios: Shifting at 5000rpm from 3rd gear into 4th (76mph), sees engine speed drop by almost 1500rpm, to a little over 3500rpm. The calculation uses the number of teeth in the ring gear and divides it by the number of teeth in the pinion gear, to provide you with a result to 1 ratio. RPM/MPH From Gear Ratio Calculator - by Wallace Racing Home of Pontiac Powered Firebirds,Trans Ams,Pontiac Powered Dragsters,Pontiac Power Rules! Gear Calculator Dealer Locator Dealer Login. Contact Us. Calculators Fixie Solve for your Tire Diameter. The following table contains a list of common aftermarket gear ratios. Ratio Calculator Use our RC gear ratio and rollout calculator to find the right pinion and spur for your car. About Us Introduction Why MFactory? And rollout calculator to find any ( one ) missing value after a tire change! Is especially helpful when trying to identify a gearset that needs replacement with the ratio! 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