Single Speed Gear Ratio Calculator, If you ride a single speed bike, measure in millimeters the length of your chainstay from the center of your bottom bracket to the desired position on your horizontal dropouts, and select this value in the picker labeled chainstay length. Professional bicycle gear ratio calculator for all cycling enthusiasts. Calculate speed, cadence, optimize bicycle drivetrain systems. Compare different cassettes and chainring combinations. Clicking on "calculate" generates two new output pages: a full-size one, and a small one which you might print out and tape to your bicycle's handlebar stem for reference. Gear ratio calculator for cyclists. Perfect for road, MTB, or single-speed bikes. Many internal-gear hubs listed and some of the cassettes are no longer in production. Generally, the main things to consider are terrain, what speed do you normally maintain on the flats, and at what approximate crank revolution (RPM) rate, and what your training goa Calculate gear ratios given chainring and sprocket (cog) sizes. Free Gear Ratio Calculator for gears, sprockets and drivetrains. Features of gears and gear trains include: The gear ratio of the pitch circles of mating gears defines the speed ratio and the mechanical advantage of the gear set. Having trouble picking out the right gear ratio for your single speed? Check out these charts to help you make the right decision. BikeCalc allows cyclists who ride single speed bikes to calculate the ideal length of chain that can fit on their chainstay. Motorcycle speed and sprocket calculator with bike database for gearing, sprockets, tires and chains of over 1900 bikes. BikeCalc lets cyclists anticipate the speed they can reach on their bicycle at a given cadence in kilometers and miles per hour. A planetary gear train provides high gear reduction in a compact package. There’s a wee bit of science/math involved here. Request yours to be added as well. Use our single-speed bike gear ratio calculator to determine the ideal gear ratio for your bike based on the number of teeth on your front chainring and rear cog. Free with charts. Calculate your bike's gear ratio instantly with our free online Bicycle Gear Ratio Calculator. The gear ratio speed calculator will determine the speed ratio of your two-gear system, while explaining the concepts of gear ratios along the way. . Calculate gear ratios, speed, cadence, and climbing ability. May 26, 2026 ยท The Early Days of Fixed Gear Ratio Cycles In the late 19th century, fixed gear ratio cycles were first introduced to the world as a racing bicycle design. Follow the steps to calculate the gear ratio. Supports Shimano, SRAM, 1x, and 2x setups. Simply put, your gear ratio compares the number of teeth in your front chainring to the number of teeth in your rear chainring. Compare gears across bikes and setups. Compare ratios, gear inches, and speed for any drivetrain. Enter the number of gear teeth to determine transmission ratios, output speed, output torque, and mechanical advantage for single-stage or compound multi-stage trains — then apply an AGMA service factor to size your gearbox. Calculate bicycle gear inches and development (meters of travel) from your chainring, cog, and wheel size. The intent of the simple calculator below is to help you choose the best gearing for the kind of riding you do on a fixed or single speed. These early fixed gear bikes were characterized by their single-speed drivetrain and lack of derailleur gears, which made them faster and more efficient than their multi-speed counterparts. Compare single-speed and fixed-gear setups with bike-first presets, live speed math, and optional skid patch analysis. Compute gear ratio, speed reduction, torque multiplication, multi-stage chain ratios, output RPM and wheel speed in mph and km/h. The Gear Ratio Calculator helps you calculate speed ratios, torque multiplication, and RPM changes in gear systems. Free comprehensive gear analysis and performance metrics. Find the ideal single speed or fixed gear ratio based on your typical terrain. For example, at 34-tooth chainring and 17-tooth rear cog have a 2:1 gear ratio. It is possible to design gear teeth for gears that are non-circular, yet still transmit torque smoothly.
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