Sprocket Diameter Chart

Below is a sprocket diameter chart for ANSI sizes #25 up to #120.

Dimensions: Inches

Chain Size → #25 #35 #40 #50 #60 #80 #100 #120
Tooth Count ↓ 1/4" Pitch 3/8" Pitch 1/2" Pitch 5/8" Pitch 3/4" Pitch 1" Pitch 1-1/4" Pitch 1-1/2" Pitch
9 0.837 1.256 1.674 2.093 2.511 3.348 4.185 5.022
10 0.920 1.379 1.839 2.299 2.759 3.678 4.598 5.517
11 1.002 1.502 2.003 2.504 3.005 4.006 5.008 6.009
12 1.083 1.625 2.166 2.708 3.249 4.332 5.415 6.498
13 1.164 1.746 2.329 2.911 3.493 4.657 5.821 6.986
14 1.245 1.868 2.491 3.113 3.736 4.981 6.226 7.472
15 1.326 1.989 2.652 3.315 3.978 5.304 6.630 7.956
16 1.407 2.110 2.814 3.517 4.220 5.627 7.034 8.441
17 1.487 2.231 2.975 3.718 4.462 5.949 7.436 8.924
18 1.568 2.352 3.136 3.919 4.703 6.271 7.839 9.407
19 1.648 2.472 3.297 4.121 4.945 6.593 8.241 9.890
20 1.729 2.593 3.457 4.321 5.186 6.914 8.643 10.371
21 1.809 2.713 3.618 4.522 5.426 7.235 9.044 10.853
22 1.889 2.833 3.778 4.722 5.666 7.555 9.444 11.333
23 1.969 2.954 3.938 4.923 5.907 7.876 9.845 11.814
24 2.049 3.074 4.098 5.123 6.147 8.196 10.245 12.294
25 2.129 3.194 4.258 5.323 6.387 8.516 10.645 12.774
26 2.209 3.314 4.418 5.523 6.627 8.836 11.045 13.254
27 2.289 3.434 4.578 5.723 6.867 9.156 11.445 13.734
28 2.369 3.553 4.738 5.922 7.106 9.475 11.844 14.213
29 2.449 3.673 4.898 6.122 7.346 9.795 12.244 14.693
30 2.529 3.793 5.057 6.321 7.586 10.114 12.643 15.171
31 2.609 3.913 5.217 6.521 7.826 10.434 13.043 15.651
32 2.688 4.032 5.377 6.721 8.065 10.753 13.441 16.130
33 2.768 4.152 5.537 6.921 8.305 11.073 13.841 16.610
34 2.848 4.272 5.696 7.119 8.543 11.391 14.239 17.087
35 2.928 4.392 5.856 7.319 8.783 11.711 14.639 17.567
36 3.008 4.511 6.015 7.519 9.023 12.030 15.038 18.045
37 3.087 4.631 6.175 7.718 9.262 12.349 15.436 18.524
38 3.167 4.751 6.334 7.918 9.501 12.668 15.835 19.002
39 3.247 4.870 6.494 8.117 9.740 12.987 16.234 19.481
40 3.327 4.990 6.653 8.316 9.980 13.306 16.633 19.959
41 3.406 5.109 6.813 8.516 10.219 13.625 17.031 20.438
42 3.486 5.229 6.972 8.715 10.458 13.944 17.430 20.916
43 3.566 5.349 7.132 8.914 10.697 14.263 17.829 21.395
44 3.646 5.468 7.291 9.114 10.937 14.582 18.228 21.873
45 3.725 5.588 7.451 9.313 11.176 14.901 18.626 22.352
46 3.805 5.707 7.610 9.512 11.414 15.219 19.024 22.829
47 3.885 5.827 7.769 9.711 11.654 15.538 19.423 23.307
48 3.964 5.946 7.929 9.911 11.893 15.857 19.821 23.786
49 4.044 6.066 8.088 10.110 12.132 16.176 20.220 24.264
50 4.124 6.186 8.248 10.309 12.371 16.495 20.619 24.743
51 4.203 6.305 8.407 10.508 12.610 16.813 21.016 25.220
52 4.283 6.425 8.566 10.708 12.849 17.132 21.415 25.698
53 4.363 6.544 8.726 10.907 13.088 17.451 21.814 26.177
54 4.442 6.663 8.885 11.106 13.327 17.769 22.211 26.654
55 4.522 6.783 9.044 11.305 13.566 18.088 22.610 27.132
56 4.602 6.903 9.204 11.504 13.805 18.407 23.009 27.611
57 4.681 7.022 9.363 11.703 14.044 18.725 23.406 28.088
58 4.761 7.142 9.522 11.903 14.283 19.044 23.805 28.566
59 4.841 7.261 9.682 12.102 14.522 19.363 24.204 29.045
60 4.920 7.380 9.841 12.301 14.761 19.681 24.601 29.522
61 5.000 7.500 10.000 12.500 15.000 20.000 25.000 30.000
62 5.080 7.619 10.159 12.699 15.239 20.318 25.398 30.477
63 5.159 7.739 10.319 12.898 15.478 20.637 25.796 30.956
64 5.239 7.859 10.478 13.098 15.717 20.956 26.195 31.434
65 5.319 7.978 10.637 13.296 15.956 21.274 26.593 31.911
66 5.398 8.097 10.797 13.496 16.195 21.593 26.991 32.390
67 5.478 8.217 10.956 13.694 16.433 21.911 27.389 32.867
68 5.558 8.336 11.115 13.894 16.673 22.230 27.788 33.345
69 5.637 8.456 11.274 14.093 16.911 22.548 28.185 33.822
70 5.717 8.575 11.434 14.292 17.150 22.867 28.584 34.301
71 5.796 8.694 11.593 14.491 17.389 23.185 28.981 34.778
72 5.876 8.814 11.752 14.690 17.628 23.504 29.380 35.256
73 5.956 8.933 11.911 14.889 17.867 23.822 29.778 35.733
74 6.035 9.053 12.071 15.088 18.106 24.141 30.176 36.212
75 6.115 9.172 12.230 15.287 18.344 24.459 30.574 36.689
76 6.195 9.292 12.389 15.486 18.584 24.778 30.973 37.167
77 6.274 9.411 12.548 15.685 18.822 25.096 31.370 37.644
78 6.354 9.531 12.708 15.884 19.061 25.415 31.769 38.123
79 6.433 9.650 12.867 16.083 19.300 25.733 32.166 38.600
80 6.513 9.770 13.026 16.283 19.539 26.052 32.565 39.078
81 6.593 9.889 13.185 16.481 19.778 26.370 32.963 39.555
82 6.672 10.008 13.345 16.681 20.017 26.689 33.361 40.034
83 6.752 10.128 13.504 16.879 20.255 27.007 33.759 40.511
84 6.832 10.247 13.663 17.079 20.495 27.326 34.158 40.989
85 6.911 10.367 13.822 17.278 20.733 27.644 34.555 41.466
86 6.991 10.486 13.981 17.476 20.972 27.962 34.953 41.943
87 7.070 10.605 14.141 17.676 21.211 28.281 35.351 42.422
88 7.150 10.725 14.300 17.874 21.449 28.599 35.749 42.899
89 7.230 10.844 14.459 18.074 21.689 28.918 36.148 43.377
90 7.309 10.964 14.618 18.273 21.927 29.236 36.545 43.854
91 7.389 11.083 14.778 18.472 22.166 29.555 36.944 44.333
92 7.468 11.202 14.937 18.671 22.405 29.873 37.341 44.810
93 7.548 11.322 15.096 18.870 22.644 30.192 37.740 45.288
94 7.628 11.441 15.255 19.069 22.883 30.510 38.138 45.765
95 7.707 11.561 15.414 19.268 23.121 30.828 38.535 46.242
96 7.787 11.680 15.574 19.467 23.360 31.147 38.934 46.721
97 7.866 11.799 15.733 19.666 23.599 31.465 39.331 47.198
98 7.946 11.919 15.892 19.865 23.838 31.784 39.730 47.676
99 8.026 12.038 16.051 20.064 24.077 32.102 40.128 48.153
100 8.105 12.158 16.211 20.263 24.316 32.421 40.526 48.632
101 8.185 12.277 16.370 20.462 24.554 32.739 40.924 49.109
102 8.264 12.396 16.529 20.661 24.793 33.057 41.321 49.586
103 8.344 12.516 16.688 20.860 25.032 33.376 41.720 50.064
104 8.424 12.635 16.847 21.059 25.271 33.694 42.118 50.541
105 8.503 12.755 17.007 21.258 25.510 34.013 42.516 51.020
106 8.583 12.874 17.166 21.457 25.748 34.331 42.914 51.497
107 8.662 12.993 17.325 21.656 25.987 34.649 43.311 51.974
108 8.742 13.113 17.484 21.855 26.226 34.968 43.710 52.452
109 8.822 13.232 17.643 22.054 26.465 35.286 44.108 52.929
110 8.901 13.352 17.803 22.253 26.704 35.605 44.506 53.408
111 8.981 13.471 17.962 22.452 26.942 35.923 44.904 53.885
112 9.060 13.590 18.121 22.651 27.181 36.241 45.301 54.362
113 9.140 13.710 18.280 22.850 27.420 36.560 45.700 54.840
114 9.220 13.829 18.439 23.049 27.659 36.878 46.098 55.317
115 9.299 13.949 18.599 23.248 27.898 37.197 46.496 55.796
116 9.379 14.068 18.758 23.447 28.136 37.515 46.894 56.273
117 9.458 14.187 18.917 23.646 28.375 37.833 47.291 56.750
118 9.538 14.307 19.076 23.845 28.614 38.152 47.690 57.228
119 9.618 14.426 19.235 24.044 28.853 38.470 48.088 57.705
120 9.697 14.546 19.394 24.243 29.091 38.788 48.485 58.182
121 9.777 14.665 19.554 24.442 29.330 39.107 48.884 58.661
122 9.856 14.784 19.713 24.641 29.569 39.425 49.281 59.138
123 9.936 14.904 19.872 24.840 29.808 39.744 49.680 59.616
124 10.016 15.023 20.031 25.039 30.047 40.062 50.078 60.093
125 10.095 15.143 20.190 25.238 30.285 40.380 50.475 60.570
126 10.175 15.262 20.350 25.437 30.524 40.699 50.874 61.049
127 10.254 15.381 20.509 25.636 30.763 41.017 51.271 61.526
128 10.334 15.501 20.668 25.834 31.001 41.335 51.669 62.003
129 10.414 15.620 20.827 26.034 31.241 41.654 52.068 62.481
130 10.493 15.740 20.986 26.233 31.479 41.972 52.465 62.958
131 10.573 15.859 21.146 26.432 31.718 42.291 52.864 63.437
132 10.652 15.978 21.305 26.631 31.957 42.609 53.261 63.914
133 10.732 16.098 21.464 26.829 32.195 42.927 53.659 64.391
134 10.812 16.217 21.623 27.029 32.435 43.246 54.058 64.869
135 10.891 16.337 21.782 27.228 32.673 43.564 54.455 65.346
136 10.971 16.456 21.941 27.426 32.912 43.882 54.853 65.823
137 11.050 16.575 22.101 27.626 33.151 44.201 55.251 66.302
138 11.130 16.695 22.260 27.824 33.389 44.519 55.649 66.779
139 11.210 16.814 22.419 28.024 33.629 44.838 56.048 67.257
140 11.289 16.934 22.578 28.223 33.867 45.156 56.445 67.734
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