FixedGears is a gear calculator for riders of single-speed and fixed-gear bikes. It calculates gearing for various chainring and cog sizes, cadence, speeds, skid patches (1- or 2-leg), alternate gearing (real). Suggestions? Send 'em! Note: Current app version uses English locale (i. E. It uses a dot as a decimal separator) even if you choose a non-English locale (i. E.