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).
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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. one that uses a comma as a decimal separator).
Tablet-capable! App tested on Nexus 7 and Android 4.4.2 Kit Kat.
v.1.27 Bug-fix on v.1.25. Thanks to Rhysiart. Apologies for the frequent updates today.
v.1.26 Ensured app can run on Android Donut 1.6 instead of just Honeycomb 3.0.
v.1.25 Increased max. cadence to 200rpm after seeing proof it could be done!
v.1.24 Updated to provide content rating. Fixed force-close bug when using non-English locale. Successfully tested under Android 3.0 Honeycomb emulator (one issue: skid patches image is upside down).