SPROCKET PITCH DIAMETER CONSTANTS
SPEED RATIOS
Speed Ratios for Sprocket Combinations - Formula: Driven Sprocket ÷ Driver Sprocket = Ratio # of Teeth: Driven Sprocket Driver Sprocket Teeth
All dimensions are in inches unless otherwise indicated.
Number of Teeth
Constant
Number of Teeth
Constant
Number of Teeth
Constant
4 5 6 7 8 9
53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150
1.4142 1.7013 2.0000 2.3048 2.6131 2.9238 3.2361 3.5495 3.8637 4.1785 4.4940 4.8097 5.1259 5.4423 5.7588 6.0756 6.3925 6.7095 7.0266 7.3439 7.6613 7.9787 8.2962 8.6138 8.9315 9.2491 9.5668 9.8845 10.2023 10.5201 10.8380 11.1558 11.4737 11.7917 12.1096 12.4275 12.7455 13.0635 13.3815 13.6995 14.0175 14.3356 14.6536 14.9717 15.2898 15.6079 15.9260 16.2441 16.5619
16.8803 17.1984 17.5166 17.8347 18.1529 18.4710 18.7892 19.1073 19.4255 19.7437 20.0618 20.3800 20.6982 21.0164 21.3346 21.6528 21.9710 22.2892 22.6074 22.9256 23.2438 23.5620 23.8802 24.1984 24.5166 24.8349 25.1531 25.4713 25.7896 26.1079 26.4261 26.7442 27.0626 27.3807 27.6989 28.0170 28.3355 28.6537 28.9723 29.2901 29.6082 29.9268 30.2447 30.5632 30.8815 31.1999 31.5177 31.8362 32.1540
32.473 32.791 33.109 33.427 33.746 34.064 34.382 34.701 35.019 35.337 35.655 35.974 36.292 36.610 36.929 37.247 37.565 37.883 38.201 38.519 38.837 39.156 39.475 39.794 40.112 40.430 40.748 41.066 41.384 41.702 42.020 42.338 42.656 42.975 43.293 43.611 43.930 44.249 44.567 44.885 45.203 45.521 45.840 46.158 46.477 46.796 47.114 47.432 47.750
9 1011121314151617181920212223242526 9 1.00 10 1.11 1.00 11 1.22 1.10 1.00 12 1.33 1.20 1.09 1.00 13 1.44 1.30 1.18 1.08 1.00 14 1.56 1.40 1.27 1.17 1.08 1.00 15 1.67 1.50 1.36 1.25 1.15 1.07 1.00 16 1.78 1.60 1.45 1.33 1.23 1.14 1.07 1.00 17 1.89 1.70 1.55 1.42 1.31 1.21 1.13 1.06 1.00 18 2.00 1.80 1.64 1.50 1.38 1.29 1.20 1.13 1.06 1.00 19 2.11 1.90 1.73 1.58 1.46 1.36 1.27 1.19 1.12 1.06 1.00 20 2.22 2.00 1.82 1.67 1.54 1.43 1.33 1.25 1.18 1.11 1.05 1.00 21 2.33 2.10 1.91 1.75 1.61 1.50 1.40 1.31 1.23 1.17 1.10 1.05 1.00 22 2.44 2.20 2.00 1.83 1.69 1.57 1.47 1.38 1.29 1.22 1.16 1.10 1.05 1.00 23 2.56 2.30 2.09 1.92 1.77 1.64 1.53 1.44 1.35 1.28 1.21 1.15 1.09 1.04 1.00 24 2.67 2.40 2.18 2.00 1.85 1.71 1.60 1.50 1.41 1.33 1.26 1.20 1.14 1.09 1.04 1.00 25 2.78 2.50 2.27 2.08 1.92 1.79 1.67 1.56 1.47 1.39 1.32 1.25 1.19 1.14 1.09 1.04 1.00 26 2.89 2.60 2.36 2.17 2.00 1.86 1.73 1.63 1.53 1.45 1.37 1.30 1.24 1.18 1.13 1.08 1.04 1.00 27 3.00 2.70 2.45 2.25 2.08 1.93 1.80 1.69 1.59 1.50 1.42 1.35 1.29 1.23 1.17 1.12 1.08 1.04 28 3.11 2.80 2.54 2.33 2.15 2.00 1.87 1.75 1.65 1.56 1.47 1.40 1.33 1.27 1.22 1.17 1.12 1.08 29 3.22 2.90 2.64 2.42 2.23 2.07 1.93 1.81 1.71 1.61 1.53 1.45 1.38 1.32 1.26 1.21 1.16 1.12 30 3.33 3.00 2.73 2.50 2.31 2.14 2.00 1.88 1.76 1.67 1.58 1.50 1.43 1.36 1.31 1.25 1.20 1.15 31 3.44 3.10 2.82 2.58 2.38 2.21 2.07 1.94 1.82 1.72 1.63 1.55 1.48 1.41 1.35 1.29 1.24 1.19 32 3.56 3.20 2.91 2.67 2.46 2.28 2.13 2.00 1.88 1.78 1.68 1.60 1.52 1.45 1.39 1.33 1.28 1.23 33 3.67 3.30 3.00 2.75 2.54 2.36 2.20 2.06 1.94 1.83 1.74 1.65 1.57 1.50 1.43 1.38 1.32 1.27 34 3.78 3.40 3.09 2.83 2.62 2.43 2.27 2.13 2.00 1.89 1.79 1.70 1.62 1.55 1.48 1.42 1.36 1.31 35 3.89 3.50 3.18 2.92 2.69 2.50 2.33 2.19 2.06 1.95 1.84 1.75 1.67 1.59 1.52 1.46 1.40 1.34 36 4.00 3.60 3.27 3.00 2.77 2.57 2.40 2.25 2.12 2.00 1.89 1.80 1.71 1.63 1.57 1.50 1.44 1.38 37 4.11 3.70 3.36 3.08 2.85 2.64 2.47 2.31 2.18 2.06 1.95 1.85 1.76 1.68 1.61 1.54 1.48 1.42 38 4.22 3.80 3.45 3.17 2.92 2.71 2.53 2.38 2.24 2.11 2.00 1.90 1.81 1.73 1.65 1.58 1.52 1.46 39 4.33 3.90 3.55 3.25 3.00 2.79 2.60 2.44 2.29 2.17 2.05 1.95 1.86 1.77 1.70 1.63 1.56 1.50 40 4.44 4.00 3.64 3.33 3.08 2.86 2.67 2.50 2.35 2.22 2.10 2.00 1.90 1.82 1.74 1.67 1.60 1.54 41 4.56 4.10 3.73 3.42 3.15 2.93 2.73 2.56 2.41 2.28 2.16 2.05 1.95 1.86 1.78 1.71 1.64 1.58 42 4.67 4.20 3.82 3.50 3.23 3.00 2.80 2.63 2.47 2.34 2.21 2.10 2.00 1.91 1.83 1.75 1.68 1.61 43 4.78 4.30 3.91 3.58 3.31 3.07 2.87 2.69 2.53 2.39 2.26 2.15 2.05 1.95 1.87 1.79 1.72 1.65 44 4.89 4.40 4.00 3.67 3.38 3.14 2.93 2.75 2.59 2.44 2.32 2.20 2.10 2.00 1.91 1.83 1.76 1.69 45 5.00 4.50 4.09 3.75 3.46 3.21 3.00 2.81 2.65 2.50 2.37 2.25 2.14 2.04 1.96 1.88 1.80 1.73 46 5.11 4.60 4.18 3.83 3.54 3.29 3.07 2.88 2.71 2.56 2.42 2.30 2.19 2.09 2.00 1.92 1.84 1.77 47 5.22 4.70 4.27 3.92 3.62 3.36 3.13 2.94 2.76 2.61 2.47 2.35 2.24 2.14 2.04 1.96 1.88 1.81 48 5.33 4.80 4.36 4.00 3.69 3.43 3.20 3.00 2.82 2.67 2.52 2.40 2.28 2.19 2.09 2.00 1.92 1.84 49 5.44 4.90 4.45 4.08 3.77 3.50 3.27 3.06 2.88 2.72 2.58 2.45 2.33 2.23 2.13 2.04 1.96 1.88 50 5.56 5.00 4.55 4.17 3.85 3.57 3.33 3.13 2.94 2.78 2.63 2.50 2.38 2.27 2.17 2.08 2.00 1.92 51 5.67 5.10 4.64 4.25 3.92 3.64 3.40 3.19 3.00 2.83 2.68 2.55 2.43 2.32 2.22 2.13 2.04 1.96 52 5.78 5.20 4.73 4.33 4.00 3.71 3.47 3.25 3.06 2.89 2.74 2.60 2.48 2.36 2.26 2.17 2.08 2.00 53 5.89 5.30 4.82 4.42 4.08 3.79 3.53 3.31 3.12 2.94 2.79 2.65 2.52 2.41 2.30 2.21 2.12 2.04 54 6.00 5.40 4.91 4.50 4.15 3.86 3.60 3.38 3.18 3.00 2.84 2.70 2.57 2.45 2.35 2.25 2.16 2.07 55 6.11 5.50 5.00 4.58 4.23 3.93 3.67 3.44 3.24 3.06 2.90 2.75 2.62 2.50 2.39 2.29 2.20 2.12 56 6.22 5.60 5.09 4.67 4.31 4.00 3.73 3.50 3.29 3.11 2.95 2.80 2.67 2.55 2.43 2.33 2.24 2.15 57 6.33 5.70 5.18 4.75 4.38 4.07 3.80 3.56 3.35 3.17 3.00 2.85 2.71 2.59 2.49 2.38 2.28 2.19 58 6.44 5.80 5.27 4.83 4.46 4.14 3.87 3.63 3.41 3.22 3.05 2.90 2.76 2.64 2.52 2.42 2.32 2.23 59 6.56 5.90 5.36 4.92 4.54 4.21 3.93 3.69 3.47 3.28 3.11 2.95 2.81 2.68 2.57 2.46 2.36 2.27 60 6.67 6.00 5.45 5.00 4.61 4.28 4.00 3.75 3.53 3.34 3.16 3.00 2.86 2.72 2.61 2.50 2.40 2.30 68 7.55 6.80 6.18 5.66 5.23 4.86 4.54 4.25 4.00 3.78 3.58 3.40 3.24 3.09 2.96 2.84 2.72 2.61 70 7.78 7.00 6.36 5.83 5.38 5.00 4.67 4.38 4.12 3.89 3.68 3.50 3.33 3.18 3.05 2.92 2.80 2.69 72 8.00 7.20 6.54 6.00 5.54 5.14 4.80 4.50 4.24 4.00 3.79 3.60 3.43 3.27 3.13 3.00 2.88 2.77 76 6.91 6.33 5.84 5.43 5.07 4.75 4.47 4.23 4.00 3.80 3.62 3.45 3.31 3.17 3.04 2.92 80 7.27 6.66 6.15 5.71 5.34 5.00 4.70 4.45 4.21 4.00 3.81 3.63 3.48 3.34 3.20 3.07 84 7.00 6.46 6.00 5.60 5.25 4.94 4.67 4.42 4.20 4.00 3.81 3.65 3.50 3.36 3.23 95 7.31 6.78 6.33 5.94 5.59 5.28 5.00 4.75 4.52 4.32 4.13 3.96 3.80 3.65 96 7.38 6.85 6.40 6.00 5.64 5.34 5.05 4.80 4.57 4.36 4.18 4.00 3.84 3.69 102 7.28 6.80 6.38 6.00 5.67 5.37 5.10 4.86 4.63 4.44 4.25 4.08 3.92 112 7.00 6.59 6.23 5.89 5.60 5.33 5.08 4.87 4.67 4.48 4.30
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52
100 101
To obtain the pitch diameter of a sprocket, multiply the constant for the number of teeth (as shown above) by the chain pitch.
To determine the pitch diameter of a 28-tooth sprocket for 140 chain — use a constant of 8.9315 and multiply by chain pitch (1.750") to obtain a pitch diameter of 15.630". IE: 140A28 P.D = 15.629".
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