Gear Ratio Calculator

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The calculations below are approximate for 700c & 27 Inch wheels.

To calculate the exact gearing, divide the number of chainring teeth by the number of sprocket teeth and multiply the answer by the actual rolling diameter of the tyred wheel. (Divide actual rolling circumference by 3.142 to calculate rolling diameter)

 

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Sprocket 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 38
Chainring
20 49.1 45 41.5 38.6 36 33.8 31.8 30 28.4 27 25.7 24.5 23.5 22.5 21.6 20.8 20 19.3 18.6 18 17.4 16.9 16.4 15.9 14.2
21 51.5 47.3 43.6 40.5 37.8 35.4 33.4 31.5 29.8 28.4 27 25.8 24.7 23.6 22.7 21.8 21 20.3 19.6 18.9 18.3 17.7 17.2 16.7 14.9
22 54 49.5 45.7 42.4 39.6 37.1 34.9 33 31.3 29.7 28.3 27 25.8 24.8 23.8 22.8 22 21.2 20.5 19.8 19.2 18.6 18 17.5 15.6
23 56.5 51.8 47.8 44.4 41.4 38.8 36.5 34.5 32.7 31.1 29.6 28.2 27 25.9 24.8 23.9 23 22.2 21.4 20.7 20 19.4 18.8 18.3 16.3
24 58.9 54 49.8 46.3 43.2 40.5 38.1 36 34.1 32.4 30.9 29.5 28.2 27 25.9 24.9 24 23.1 22.3 21.6 20.9 20.3 19.6 19.1 17.1
25 61.4 56.3 51.9 48.2 45 42.2 39.7 37.5 35.5 33.8 32.1 30.7 29.3 28.1 27 26 25 24.1 23.3 22.5 21.8 21.1 20.5 19.9 17.8
26 63.8 58.5 54 50.1 46.8 43.9 41.3 39 36.9 35.1 33.4 31.9 30.5 29.3 28.1 27 26 25.1 24.2 23.4 22.6 21.9 21.3 20.6 18.5
27 66.3 60.8 56.1 52.1 48.6 45.6 42.9 40.5 38.4 36.5 34.7 33.1 31.7 30.4 29.2 28 27 26 25.1 24.3 23.5 22.8 22.1 21.4 19.2
28 68.7 63 58.2 54 50.4 47.3 44.5 42 39.8 37.8 36 34.4 32.9 31.5 30.2 29.1 28 27 26.1 25.2 24.4 23.6 22.9 22.2 19.9
29 71.2 65.3 60.2 55.9 52.2 48.9 46.1 43.5 41.2 39.2 37.3 35.6 34 32.6 31.3 30.1 29 28 27 26.1 25.3 24.5 23.7 23 20.6
30 73.6 67.5 62.3 57.9 54 50.6 47.6 45 42.6 40.5 38.6 36.8 35.2 33.8 32.4 31.2 30 28.9 27.9 27 26.1 25.3 24.5 23.8 21.3
31 76.1 69.8 64.4 59.8 55.8 52.3 49.2 46.5 44.1 41.9 39.9 38 36.4 34.9 33.5 32.2 31 29.9 28.9 27.9 27 26.2 25.4 24.6 22
32 78.5 72 66.5 61.7 57.6 54 50.8 48 45.5 43.2 41.1 39.3 37.6 36 34.6 33.2 32 30.9 29.8 28.8 27.9 27 26.2 25.4 22.7
33 81 74.3 68.5 63.6 59.4 55.7 52.4 49.5 46.9 44.6 42.4 40.5 38.7 37.1 35.6 34.3 33 31.8 30.7 29.7 28.7 27.8 27 26.2 23.4
34 83.5 76.5 70.6 65.6 61.2 57.4 54 51 48.3 45.9 43.7 41.7 39.9 38.3 36.7 35.3 34 32.8 31.7 30.6 29.6 28.7 27.8 27 24.2
35 85.9 78.8 72.7 67.5 63 59.1 55.6 52.5 49.7 47.3 45 43 41.1 39.4 37.8 36.3 35 33.8 32.6 31.5 30.5 29.5 28.6 27.8 24.9
36 88.4 81 74.8 69.4 64.8 60.8 57.2 54 51.2 48.6 46.3 44.2 42.3 40.5 38.9 37.4 36 34.7 33.5 32.4 31.4 30.4 29.5 28.6 25.6
37 90.8 83.3 76.8 71.4 66.6 62.4 58.8 55.5 52.6 50 47.6 45.4 43.4 41.6 40 38.4 37 35.7 34.4 33.3 32.2 31.2 30.3 29.4 26.3
38 93.3 85.5 78.9 73.3 68.4 64.1 60.4 57 54 51.3 48.9 46.6 44.6 42.8 41 39.5 38 36.6 35.4 34.2 33.1 32.1 31.1 30.2 27
39 95.7 87.8 81 75.2 70.2 65.8 61.9 58.5 55.4 52.7 50.1 47.9 45.8 43.9 42.1 40.5 39 37.6 36.3 35.1 34 32.9 31.9 31 27.7
40 98.2 90 83.1 77.1 72 67.5 63.5 60 56.8 54 51.4 49.1 47 45 43.2 41.5 40 38.6 37.2 36 34.8 33.8 32.7 31.8 28.4
41 100.6 92.3 85.2 79.1 73.8 69.2 65.1 61.5 58.3 55.4 52.7 50.3 48.1 46.1 44.3 42.6 41 39.5 38.2 36.9 35.7 34.6 33.5 32.6 29.1
42 103.1 94.5 87.2 81 75.6 70.9 66.7 63 59.7 56.7 54 51.5 49.3 47.3 45.4 43.6 42 40.5 39.1 37.8 36.6 35.4 34.4 33.4 29.8
43 105.5 96.8 89.3 82.9 77.4 72.6 68.3 64.5 61.1 58.1 55.3 52.8 50.5 48.4 46.4 44.7 43 41.5 40 38.7 37.5 36.3 35.2 34.1 30.6
44 108 99 91.4 84.9 79.2 74.3 69.9 66 62.5 59.4 56.6 54 51.7 49.5 47.5 45.7 44 42.4 41 39.6 38.3 37.1 36 34.9 31.3
45 110.5 101.3 93.5 86.8 81 75.9 71.5 67.5 63.9 60.8 57.9 55.2 52.8 50.6 48.6 46.7 45 43.4 41.9 40.5 39.2 38 36.8 35.7 32
46 112.9 103.5 95.5 88.7 82.8 77.6 73.1 69 65.4 62.1 59.1 56.5 54 51.8 49.7 47.8 46 44.4 42.8 41.4 40.1 38.8 37.6 36.5 32.7
47 115.4 105.8 97.6 90.6 84.6 79.3 74.6 70.5 66.8 63.5 60.4 57.7 55.2 52.9 50.8 48.8 47 45.3 43.8 42.3 40.9 39.7 38.5 37.3 33.4
48 117.8 108 99.7 92.6 86.4 81 76.2 72 68.2 64.8 61.7 58.9 56.3 54 51.8 49.8 48 46.3 44.7 43.2 41.8 40.5 39.3 38.1 34.1
49 120.3 110.3 101.8 94.5 88.2 82.7 77.8 73.5 69.6 66.2 63 60.1 57.5 55.1 52.9 50.9 49 47.3 45.6 44.1 42.7 41.3 40.1 38.9 34.8
50 122.7 112.5 103.8 96.4 90 84.4 79.4 75 71.1 67.5 64.3 61.4 58.7 56.3 54 51.9 50 48.2 46.6 45 43.5 42.2 40.9 39.7 35.5
51 125.2 114.8 105.9 98.4 91.8 86.1 81 76.5 72.5 68.9 65.6 62.6 59.9 57.4 55.1 53 51 49.2 47.5 45.9 44.4 43 41.7 40.5 36.2
52 127.6 117 108 100.3 93.6 87.8 82.6 78 73.9 70.2 66.9 63.8 61 58.5 56.2 54 52 50.1 48.4 46.8 45.3 43.9 42.5 41.3 36.9
53 130.1 119.3 110.1 102.2 95.4 89.4 84.2 79.5 75.3 71.6 68.1 65 62.2 59.6 57.2 55 53 51.1 49.3 47.7 46.2 44.7 43.4 42.1 37.7
54 132.5 121.5 112.2 104.1 97.2 91.1 85.8 81 76.7 72.9 69.4 66.3 63.4 60.8 58.3 56.1 54 52.1 50.3 48.6 47 45.6 44.2 42.9 38.4
55 135 123.8 114.2 106.1 99 92.8 87.4 82.5 78.2 74.3 70.7 67.5 64.6 61.9 59.4 57.1 55 53 51.2 49.5 47.9 46.4 45 43.7 39.1
56 137.5 126 116.3 108 100.8 94.5 88.9 84 79.6 75.6 72 68.7 65.7 63 60.5 58.2 56 54 52.1 50.4 48.8 47.3 45.8 44.5 39.8
57 139.9 128.3 118.4 109.9 102.6 96.2 90.5 85.5 81 77 73.3 70 66.9 64.1 61.6 59.2 57 55 53.1 51.3 49.6 48.1 46.6 45.3 40.5
58 142.4 130.5 120.5 111.9 104.4 97.9 92.1 87 82.4 78.3 74.6 71.2 68.1 65.3 62.6 60.2 58 55.9 54 52.2 50.5 48.9 47.5 46.1 41.2
59 144.8 132.8 122.5 113.8 106.2 99.6 93.7 88.5 83.8 79.7 75.9 72.4 69.3 66.4 63.7 61.3 59 56.9 54.9 53.1 51.4 49.8 48.3 46.9 41.9
60 147.3 135 124.6 115.7 108 101.3 95.3 90 85.3 81 77.1 73.6 70.4 67.5 64.8 62.3 60 57.9 55.9 54 52.3 50.6 49.1 47.6 42.6

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