How-To Articles
Sprocket Ratios
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Written By: Scott

Thinking of changing to a different sprocket tooth configuration? Read on for a chart that provides gear ratios for almost any combination of Front & Rear sprockets.

Sprocket Ratio Chart
(Read the rear sprocket down the left side, front along the top)
  12 13 14 15 16 17 18 19 20
40 3.333 3.077 2.857 2.667 2.500 2.353 2.222 2.105 2.000
41 3.417 3.154 2.929 2.733 2.562 2.412 2.278 2.158 2.050
42 3.500 3.231 3.000 2.800 2.625 2.471 2.333 2.211 2.100
43 3.583 3.308 3.071 2.867 2.688 2.529 2.389 2.263 2.150
44 3.667 3.385 3.143 2.933 2.750 2.588 2.444 2.316 2.200
45 3.750 3.462 3.214 3.000 2.812 2.647 2.500 2.368 2.250
46 3.833 3.538 3.286 3.067 2.875 2.706 2.556 2.421 2.300
47 3.917 3.615 3.357 3.133 2.938 2.765 2.611 2.474 2.350
48 4.000 3.692 3.429 3.200 3.000 2.824 2.667 2.526 2.400
49 4.083 3.769 3.500 3.267 3.062 2.882 2.722 2.579 2.450
  12 13 14 15 16 17 18 19 20
50 4.167 3.846 3.571 3.333 3.125 2.941 2.778 2.632 2.500
51 4.250 3.923 3.643 3.400 3.188 3.000 2.833 2.684 2.550
52 4.333 4.000 3.714 3.467 3.250 3.059 2.889 2.737 2.600
53 4.417 4.077 3.786 3.533 3.312 3.118 2.944 2.789 2.650
54 4.500 4.154 3.857 3.600 3.375 3.176 3.000 2.842 2.700
55 4.583 4.231 3.929 3.667 3.438 3.235 3.056 2.895 2.750
56 4.667 4.308 4.000 3.733 3.500 3.294 3.111 2.947 2.800
57 4.750 4.385 4.071 3.800 3.562 3.353 3.167 3.000 2.850
58 4.833 4.462 4.143 3.867 3.625 3.412 3.222 3.053 2.900
59 4.917 4.538 4.214 3.933 3.688 3.471 3.278 3.105 2.950
60 5.000 4.615 4.286 4.000 3.750 3.529 3.333 3.158 3.000
  12 13 14 15 16 17 18 19 20

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