The below table is the most robust table I could fit. In the left column (or y axis) is the rear sprocket. In the top row is the front sprocket. I’ll explain how this table works. Gear ratios are just as they sound, ratios. So its the ratio of rear sprocket to front sprocket.
Here is how you need to think about this. Lower number = higher potential top speed. It is a ratio of revolutions. So when you see a number below 0, that means that the rear sprocket is turning more than one full time for each turn of the front sprocket.
Sprockets | 6 [Tooth Front] | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | |
6 [Tooth Rear] | 1.000 | 0.857 | 0.750 | 0.667 | 0.600 | 0.545 | 0.500 | 0.462 | 0.429 | 0.400 | 0.375 | 0.353 | 0.333 | 0.316 | 0.300 | 0.286 | 0.273 | |
7 | 1.167 | 1.000 | 0.875 | 0.778 | 0.700 | 0.636 | 0.583 | 0.538 | 0.500 | 0.467 | 0.438 | 0.412 | 0.389 | 0.368 | 0.350 | 0.333 | 0.318 | |
8 | 1.333 | 1.143 | 1.000 | 0.889 | 0.800 | 0.727 | 0.667 | 0.615 | 0.571 | 0.533 | 0.500 | 0.471 | 0.444 | 0.421 | 0.400 | 0.381 | 0.364 | |
9 | 1.500 | 1.286 | 1.125 | 1.000 | 0.900 | 0.818 | 0.750 | 0.692 | 0.643 | 0.600 | 0.563 | 0.529 | 0.500 | 0.474 | 0.450 | 0.429 | 0.409 | |
10 | 1.667 | 1.429 | 1.250 | 1.111 | 1.000 | 0.909 | 0.833 | 0.769 | 0.714 | 0.667 | 0.625 | 0.588 | 0.556 | 0.526 | 0.500 | 0.476 | 0.455 | |
11 | 1.833 | 1.571 | 1.375 | 1.222 | 1.100 | 1.000 | 0.917 | 0.846 | 0.786 | 0.733 | 0.688 | 0.647 | 0.611 | 0.579 | 0.550 | 0.524 | 0.500 | |
12 | 2.000 | 1.714 | 1.500 | 1.333 | 1.200 | 1.091 | 1.000 | 0.923 | 0.857 | 0.800 | 0.750 | 0.706 | 0.667 | 0.632 | 0.600 | 0.571 | 0.545 | |
13 | 2.167 | 1.857 | 1.625 | 1.444 | 1.300 | 1.182 | 1.083 | 1.000 | 0.929 | 0.867 | 0.813 | 0.765 | 0.722 | 0.684 | 0.650 | 0.619 | 0.591 | |
14 | 2.333 | 2.000 | 1.750 | 1.556 | 1.400 | 1.273 | 1.167 | 1.077 | 1.000 | 0.933 | 0.875 | 0.824 | 0.778 | 0.737 | 0.700 | 0.667 | 0.636 | |
15 | 2.500 | 2.143 | 1.875 | 1.667 | 1.500 | 1.364 | 1.250 | 1.154 | 1.071 | 1.000 | 0.938 | 0.882 | 0.833 | 0.789 | 0.750 | 0.714 | 0.682 | |
16 | 2.667 | 2.286 | 2.000 | 1.778 | 1.600 | 1.455 | 1.333 | 1.231 | 1.143 | 1.067 | 1.000 | 0.941 | 0.889 | 0.842 | 0.800 | 0.762 | 0.727 | |
17 | 2.833 | 2.429 | 2.125 | 1.889 | 1.700 | 1.545 | 1.417 | 1.308 | 1.214 | 1.133 | 1.063 | 1.000 | 0.944 | 0.895 | 0.850 | 0.810 | 0.773 | |
18 | 3.000 | 2.571 | 2.250 | 2.000 | 1.800 | 1.636 | 1.500 | 1.385 | 1.286 | 1.200 | 1.125 | 1.059 | 1.000 | 0.947 | 0.900 | 0.857 | 0.818 | |
19 | 3.167 | 2.714 | 2.375 | 2.111 | 1.900 | 1.727 | 1.583 | 1.462 | 1.357 | 1.267 | 1.188 | 1.118 | 1.056 | 1.000 | 0.950 | 0.905 | 0.864 | |
20 | 3.333 | 2.857 | 2.500 | 2.222 | 2.000 | 1.818 | 1.667 | 1.538 | 1.429 | 1.333 | 1.250 | 1.176 | 1.111 | 1.053 | 1.000 | 0.952 | 0.909 | |
21 | 3.500 | 3.000 | 2.625 | 2.333 | 2.100 | 1.909 | 1.750 | 1.615 | 1.500 | 1.400 | 1.313 | 1.235 | 1.167 | 1.105 | 1.050 | 1.000 | 0.955 | |
22 | 3.667 | 3.143 | 2.750 | 2.444 | 2.200 | 2.000 | 1.833 | 1.692 | 1.571 | 1.467 | 1.375 | 1.294 | 1.222 | 1.158 | 1.100 | 1.048 | 1.000 | |
23 | 3.833 | 3.286 | 2.875 | 2.556 | 2.300 | 2.091 | 1.917 | 1.769 | 1.643 | 1.533 | 1.438 | 1.353 | 1.278 | 1.211 | 1.150 | 1.095 | 1.045 | |
24 | 4.000 | 3.429 | 3.000 | 2.667 | 2.400 | 2.182 | 2.000 | 1.846 | 1.714 | 1.600 | 1.500 | 1.412 | 1.333 | 1.263 | 1.200 | 1.143 | 1.091 | |
25 | 4.167 | 3.571 | 3.125 | 2.778 | 2.500 | 2.273 | 2.083 | 1.923 | 1.786 | 1.667 | 1.563 | 1.471 | 1.389 | 1.316 | 1.250 | 1.190 | 1.136 | |
26 | 4.333 | 3.714 | 3.250 | 2.889 | 2.600 | 2.364 | 2.167 | 2.000 | 1.857 | 1.733 | 1.625 | 1.529 | 1.444 | 1.368 | 1.300 | 1.238 | 1.182 | |
27 | 4.500 | 3.857 | 3.375 | 3.000 | 2.700 | 2.455 | 2.250 | 2.077 | 1.929 | 1.800 | 1.688 | 1.588 | 1.500 | 1.421 | 1.350 | 1.286 | 1.227 | |
28 | 4.667 | 4.000 | 3.500 | 3.111 | 2.800 | 2.545 | 2.333 | 2.154 | 2.000 | 1.867 | 1.750 | 1.647 | 1.556 | 1.474 | 1.400 | 1.333 | 1.273 | |
29 | 4.833 | 4.143 | 3.625 | 3.222 | 2.900 | 2.636 | 2.417 | 2.231 | 2.071 | 1.933 | 1.813 | 1.706 | 1.611 | 1.526 | 1.450 | 1.381 | 1.318 | |
30 | 5.000 | 4.286 | 3.750 | 3.333 | 3.000 | 2.727 | 2.500 | 2.308 | 2.143 | 2.000 | 1.875 | 1.765 | 1.667 | 1.579 | 1.500 | 1.429 | 1.364 | |
31 | 5.167 | 4.429 | 3.875 | 3.444 | 3.100 | 2.818 | 2.583 | 2.385 | 2.214 | 2.067 | 1.938 | 1.824 | 1.722 | 1.632 | 1.550 | 1.476 | 1.409 | |
32 | 5.333 | 4.571 | 4.000 | 3.556 | 3.200 | 2.909 | 2.667 | 2.462 | 2.286 | 2.133 | 2.000 | 1.882 | 1.778 | 1.684 | 1.600 | 1.524 | 1.455 | |
33 | 5.500 | 4.714 | 4.125 | 3.667 | 3.300 | 3.000 | 2.750 | 2.538 | 2.357 | 2.200 | 2.063 | 1.941 | 1.833 | 1.737 | 1.650 | 1.571 | 1.500 | |
34 | 5.667 | 4.857 | 4.250 | 3.778 | 3.400 | 3.091 | 2.833 | 2.615 | 2.429 | 2.267 | 2.125 | 2.000 | 1.889 | 1.789 | 1.700 | 1.619 | 1.545 | |
35 | 5.833 | 5.000 | 4.375 | 3.889 | 3.500 | 3.182 | 2.917 | 2.692 | 2.500 | 2.333 | 2.188 | 2.059 | 1.944 | 1.842 | 1.750 | 1.667 | 1.591 | |
36 | 6.000 | 5.143 | 4.500 | 4.000 | 3.600 | 3.273 | 3.000 | 2.769 | 2.571 | 2.400 | 2.250 | 2.118 | 2.000 | 1.895 | 1.800 | 1.714 | 1.636 | |
37 | 6.167 | 5.286 | 4.625 | 4.111 | 3.700 | 3.364 | 3.083 | 2.846 | 2.643 | 2.467 | 2.313 | 2.176 | 2.056 | 1.947 | 1.850 | 1.762 | 1.682 | |
38 | 6.333 | 5.429 | 4.750 | 4.222 | 3.800 | 3.455 | 3.167 | 2.923 | 2.714 | 2.533 | 2.375 | 2.235 | 2.111 | 2.000 | 1.900 | 1.810 | 1.727 | |
39 | 6.500 | 5.571 | 4.875 | 4.333 | 3.900 | 3.545 | 3.250 | 3.000 | 2.786 | 2.600 | 2.438 | 2.294 | 2.167 | 2.053 | 1.950 | 1.857 | 1.773 | |
40 | 6.667 | 5.714 | 5.000 | 4.444 | 4.000 | 3.636 | 3.333 | 3.077 | 2.857 | 2.667 | 2.500 | 2.353 | 2.222 | 2.105 | 2.000 | 1.905 | 1.818 | |
41 | 6.833 | 5.857 | 5.125 | 4.556 | 4.100 | 3.727 | 3.417 | 3.154 | 2.929 | 2.733 | 2.563 | 2.412 | 2.278 | 2.158 | 2.050 | 1.952 | 1.864 | |
42 | 7.000 | 6.000 | 5.250 | 4.667 | 4.200 | 3.818 | 3.500 | 3.231 | 3.000 | 2.800 | 2.625 | 2.471 | 2.333 | 2.211 | 2.100 | 2.000 | 1.909 | |
43 | 7.167 | 6.143 | 5.375 | 4.778 | 4.300 | 3.909 | 3.583 | 3.308 | 3.071 | 2.867 | 2.688 | 2.529 | 2.389 | 2.263 | 2.150 | 2.048 | 1.955 | |
44 | 7.333 | 6.286 | 5.500 | 4.889 | 4.400 | 4.000 | 3.667 | 3.385 | 3.143 | 2.933 | 2.750 | 2.588 | 2.444 | 2.316 | 2.200 | 2.095 | 2.000 | |
45 | 7.500 | 6.429 | 5.625 | 5.000 | 4.500 | 4.091 | 3.750 | 3.462 | 3.214 | 3.000 | 2.813 | 2.647 | 2.500 | 2.368 | 2.250 | 2.143 | 2.045 | |
46 | 7.667 | 6.571 | 5.750 | 5.111 | 4.600 | 4.182 | 3.833 | 3.538 | 3.286 | 3.067 | 2.875 | 2.706 | 2.556 | 2.421 | 2.300 | 2.190 | 2.091 | |
47 | 7.833 | 6.714 | 5.875 | 5.222 | 4.700 | 4.273 | 3.917 | 3.615 | 3.357 | 3.133 | 2.938 | 2.765 | 2.611 | 2.474 | 2.350 | 2.238 | 2.136 | |
48 | 8.000 | 6.857 | 6.000 | 5.333 | 4.800 | 4.364 | 4.000 | 3.692 | 3.429 | 3.200 | 3.000 | 2.824 | 2.667 | 2.526 | 2.400 | 2.286 | 2.182 | |
49 | 8.167 | 7.000 | 6.125 | 5.444 | 4.900 | 4.455 | 4.083 | 3.769 | 3.500 | 3.267 | 3.063 | 2.882 | 2.722 | 2.579 | 2.450 | 2.333 | 2.227 | |
50 | 8.333 | 7.143 | 6.250 | 5.556 | 5.000 | 4.545 | 4.167 | 3.846 | 3.571 | 3.333 | 3.125 | 2.941 | 2.778 | 2.632 | 2.500 | 2.381 | 2.273 | |
51 | 8.500 | 7.286 | 6.375 | 5.667 | 5.100 | 4.636 | 4.250 | 3.923 | 3.643 | 3.400 | 3.188 | 3.000 | 2.833 | 2.684 | 2.550 | 2.429 | 2.318 | |
52 | 8.667 | 7.429 | 6.500 | 5.778 | 5.200 | 4.727 | 4.333 | 4.000 | 3.714 | 3.467 | 3.250 | 3.059 | 2.889 | 2.737 | 2.600 | 2.476 | 2.364 | |
53 | 8.833 | 7.571 | 6.625 | 5.889 | 5.300 | 4.818 | 4.417 | 4.077 | 3.786 | 3.533 | 3.313 | 3.118 | 2.944 | 2.789 | 2.650 | 2.524 | 2.409 | |
54 | 9.000 | 7.714 | 6.750 | 6.000 | 5.400 | 4.909 | 4.500 | 4.154 | 3.857 | 3.600 | 3.375 | 3.176 | 3.000 | 2.842 | 2.700 | 2.571 | 2.455 | |
55 | 9.167 | 7.857 | 6.875 | 6.111 | 5.500 | 5.000 | 4.583 | 4.231 | 3.929 | 3.667 | 3.438 | 3.235 | 3.056 | 2.895 | 2.750 | 2.619 | 2.500 | |
56 | 9.333 | 8.000 | 7.000 | 6.222 | 5.600 | 5.091 | 4.667 | 4.308 | 4.000 | 3.733 | 3.500 | 3.294 | 3.111 | 2.947 | 2.800 | 2.667 | 2.545 | |
57 | 9.500 | 8.143 | 7.125 | 6.333 | 5.700 | 5.182 | 4.750 | 4.385 | 4.071 | 3.800 | 3.563 | 3.353 | 3.167 | 3.000 | 2.850 | 2.714 | 2.591 | |
58 | 9.667 | 8.286 | 7.250 | 6.444 | 5.800 | 5.273 | 4.833 | 4.462 | 4.143 | 3.867 | 3.625 | 3.412 | 3.222 | 3.053 | 2.900 | 2.762 | 2.636 | |
59 | 9.833 | 8.429 | 7.375 | 6.556 | 5.900 | 5.364 | 4.917 | 4.538 | 4.214 | 3.933 | 3.688 | 3.471 | 3.278 | 3.105 | 2.950 | 2.810 | 2.682 | |
60 | 10.000 | 8.571 | 7.500 | 6.667 | 6.000 | 5.455 | 5.000 | 4.615 | 4.286 | 4.000 | 3.750 | 3.529 | 3.333 | 3.158 | 3.000 | 2.857 | 2.727 | |
61 | 10.167 | 8.714 | 7.625 | 6.778 | 6.100 | 5.545 | 5.083 | 4.692 | 4.357 | 4.067 | 3.813 | 3.588 | 3.389 | 3.211 | 3.050 | 2.905 | 2.773 | |
62 | 10.333 | 8.857 | 7.750 | 6.889 | 6.200 | 5.636 | 5.167 | 4.769 | 4.429 | 4.133 | 3.875 | 3.647 | 3.444 | 3.263 | 3.100 | 2.952 | 2.818 | |
63 | 10.500 | 9.000 | 7.875 | 7.000 | 6.300 | 5.727 | 5.250 | 4.846 | 4.500 | 4.200 | 3.938 | 3.706 | 3.500 | 3.316 | 3.150 | 3.000 | 2.864 |