Single Speed Gear Ratio Chart, There’s a wee bit of science/math involved here. Free Gear Ratio Calculator for gears, sprockets and drivetrains. Perfect for road, MTB, or single-speed bikes. The best gear ratio isn’t perfect; it’s just a good balance of trade-offs. Whether you’re commuting, climbing, or racing fixed-gear, this post will help you find your ideal gearing setup. Use this calculator to find the gear ratio of your single-speed bike based on the size of your front chainring and rear cog. Mar 7, 2026 · In mechanical engineering, a gear ratio is a direct measure of the ratio of the rotational speeds of two or more interlocking gears. 5 MPH speed at 90 RPM and allows for good acceleration and climbing. Here's what you need to know. So, if you want a taller gear, plug in a 48T ring or a 16T rear cog, for example, and see if that gives you the ratio you need. uxx, iobqz, nq7, ny6u32p, 5rbfaza, rqt7, r3thm, sp, 1xwp, v5s,