Single Speed Gear Ratio Charts

Having trouble picking out the right gear ratio for your single speed? Check out these charts to help you make the right decision. There’s a wee bit of science/math involved here. If you are a beginner to single speed mountain biking, 32/19 is a common starting point.

Basic Single Speed Gear Ratio Chart

 28303233343639
142.002.142.292.362.432.572.19
151.872.002.132.202.272.402.60
161.751.882.002.062.132.252.44
171.651.761.881.942.002.122.29
181.561.671.781.831.892.002.17
191.471.581.681.741.791.892.05
201.401.501.601.651.701.801.95
211.331.431.521.571.621.711.86
221.271.361.451.501.551.641.77
231.221.301.391.431.481.571.70
241.171.251.331.381.421.501.63
251.121.201.281.321.361.441.56

27.5 Gear Inches

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1455.0058.9362.8664.8266.7970.71
1551.3355.0058.6760.5062.3366.00
1648.1351.5655.0056.7258.4461.88
1745.2948.5351.7653.3855.0058.24
1842.7845.8348.8950.4251.9455.00
1940.5343.4246.3247.7649.2152.11
2038.5041.2544.0045.3846.7549.50
2136.6739.2941.9043.2144.5247.14
2235.0037.5040.0041.2542.5045.00
2333.4835.8738.2639.4640.6543.04
2432.0834.3836.6737.8138.9641.25
2530.8033.0035.2036.3037.4039.60

27.5+ Gear Inches

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1457.0061.0765.1467.1869.2173.29
1553.2057.0060.8062.7064.6068.40
1649.8853.4457.0058.7860.5664.13
1746.9450.2953.6555.3257.0060.35
1844.3347.5050.6752.2553.8357.00
1942.0045.0048.0049.5051.0054.00
2039.9042.7545.6047.0348.4551.30
2138.0040.7143.4344.7946.1448.86
2236.2738.8641.4542.7544.0546.64
2334.7037.1739.6540.8942.1344.61
2433.2535.6338.0039.1940.3842.75
2531.9234.2036.4837.6238.7641.04

29 Gear Inches

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1458.0062.1466.2968.3670.4374.57
1554.1358.0061.8763.8065.7369.60
1650.7554.3858.0059.8161.6365.25
1747.7651.1854.5956.2958.0061.41
1845.1148.3351.5653.1754.7858.00
1942.7445.7948.8450.3751.8954.95
2040.6043.5046.4047.8549.3052.20
2138.6741.4344.1945.5746.9549.71
2236.9139.5542.1843.5044.8247.45
2335.3037.8340.3541.6142.8745.39
2433.8336.2538.6739.8841.0843.50
2532.4834.8037.1238.2839.4441.76