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). 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. Start by entering your tire diameter in inches or your rigs current gear ratio. Access Optimum Transmission Gear Ratios Calculator. Solve for your Crawl Ratio. 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. This is especially helpful when trying to identify a gearset that needs replacement with the same ratio ring and pinion. Gear Ratio Calculation Basics. Contact Us. 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. CALCULATORS. 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. Click the "Customize" button above to learn more! Tire Size: or ... Predefined Gear Ratios: RICHMOND is the leading manufacturer of professional quality, hi-performance ring and pinion sets. Calculators Fixie 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. Use this gear ratio calculator to see what ring & pinion gear ratio will be right for you after a tire size change. Gear Calculator Dealer Locator Dealer Login. This calculator is useful for planning your rig, allowing you to see what kind of performance to expect from different combinations. Solve for your Differential Ratio. Solve for your MPH. Solve for your Transfer Case Ratio. Solve for your Transmission Ratio. 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. Transmission 1 - MPH | KM/H. RPM/MPH From Gear Ratio Calculator - by Wallace Racing Home of Pontiac Powered Firebirds,Trans Ams,Pontiac Powered Dragsters,Pontiac Power Rules! Ratio Calculator Use our RC gear ratio and rollout calculator to find the right pinion and spur for your car. 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). About Us Introduction Why MFactory? Popular OEM and Aftermarket Gear Ratios. Shifting at 5000rpm from 3rd gear into 4th (76mph), sees engine speed drop by almost 1500rpm, to a little over 3500rpm. The following table contains a list of common aftermarket gear ratios. Like magic, we instantly display what cruising RPM your setup will yield or the gear ratio you need to get your rig rollin’ right. The gear ratio calculator exactly as you see it above is 100% free for you to use. Solve for your Tire Diameter. This calc can be used to find any (one) missing value. eCart GEAR RATIO CALCULATOR. 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. Solve for your RPM. 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. GEAR RATIO, TIRE SIZE, CRAWL RATIO, ETC. 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. Crawl ratio, tire SIZE, CRAWL ratio, tire SIZE change right pinion and spur your! % free for you after a tire SIZE, CRAWL ratio, tire change. 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