SPROCKET PITCH DIAMETER CONSTANTS
Note: Values below are calculated and do not include manufacturing tolerances.
All dimensions are in inches unless otherwise indicated.
RS25 1⁄4" Pitch
RS40 1⁄2" Pitch
RS50 5⁄8" Pitch
No. of Teeth
No. of Teeth
No. of Teeth
Pitch Dia.
Outside Dia.
Caliper Dia.
Pitch Dia.
Outside Dia.
Caliper Dia.
Pitch Dia.
Outside Dia.
Caliper Dia.
9
.731 .809
.837 .919
.590 .679 .748 .836 .907 .993
8 9
1.633 1.880 1.233 1.827 2.093 1.400 2.023 2.299 1.623 2.219 2.504 1.796 2.415 2.708 2.015 2.612 2.911 2.193 2.809 3.113 2.409 3.006 3.315 2.590 3.204 3.517 2.804 3.401 3.718 2.987 3.599 3.919 3.199 3.798 4.121 3.384 3.995 4.321 3.595 4.194 4.522 3.782 4.392 4.722 3.992 4.590 4.923 4.179 4.788 5.123 4.388 4.987 5.323 4.577 5.185 5.523 4.785 5.384 5.723 4.975 5.582 5.922 5.182 5.781 6.122 5.371 5.979 6.321 5.579 6.178 6.521 5.770 6.376 6.721 5.976 6.575 6.921 6.168 6.774 7.120 6.374 6.973 7.319 6.565 7.171 7.519 6.771 7.370 7.718 6.963 7.569 7.918 7.169 7.768 8.117 7.361 7.966 8.316 7.566 8.364 8.715 7.964 8.563 8.914 8.157 8.761 9.114 8.361 8.960 9.313 8.554 9.556 9.911 9.156 9.755 10.110 9.350 9.954 10.309 9.554 10.351 10.708 9.951 10.749 11.106 10.349 10.948 11.305 10.543 11.147 11.504 10.747 11.942 12.301 11.542 13.931 14.292 13.531 14.329 14.690 13.929 15.919 16.283 15.519 16.715 17.079 16.315
8 9
1.307 1.507
.995
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 28 30 32 35 36 40 45 48 54 60 70 72
1.462 1.674 1.127 1.618 1.839 1.305 1.775 2.003 1.444 1.932 2.166 1.620 2.089 2.328 1.761 2.247 2.490 1.934 2.405 2.652 2.079 2.563 2.814 2.250 2.721 2.974 2.397 2.879 3.136 2.567 3.038 3.292 2.715 3.196 3.457 2.883 3.355 3.618 3.033 3.513 3.778 3.201 3.672 3.938 3.351 3.831 4.098 3.518 3.989 4.258 3.669 4.148 4.418 3.835 4.307 4.578 3.987 4.465 4.738 4.153 4.625 4.898 4.305 4.783 5.057 4.471 4.942 5.217 4.623 5.101 5.376 4.788 5.260 5.536 4.941 5.419 5.696 5.107 5.578 5.856 5.260 5.737 6.015 5.425 6.055 6.334 5.742 6.373 6.653 6.061 6.691 6.972 6.379 7.009 7.291 6.696 7.168 7.450 6.851 7.327 7.609 7.014 7.486 7.769 7.169 7.645 7.928 7.332 7.963 8.248 7.650 8.599 8.884 8.286 9.554 9.840 9.241 11.145 11.433 10.832 11.463 11.752 11.151 12.736 13.026 12.423 13.372 13.663 13.059
.887 1.001 .966 1.083 1.045 1.164 1.123 1.245
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 42 43 44 45 48 49 50 52 54 55 56 60 70 72 80 84 96
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 38 40 42 44 45 46 47 48 50 54 60 70 72 80 84 96
1.203 1.326 1.066 1.282 1.407 1.152 1.361 1.487 1.225 1.440 1.568 1.310 1.519 1.648 1.384 1.598 1.728 1.468 1.677 1.809 1.543 1.757 1.889 1.627 1.836 1.969 1.702 1.915 2.049 1.785 1.995 2.129 1.861 2.074 2.209 1.944 2.233 2.369 2.103 2.392 2.529 2.262 2.551 2.688 2.421 2.789 2.928 2.656 2.868 3.008 2.738 3.186 3.327 3.056 3.584 3.725 3.452 3.822 3.964 3.692 4.300 4.442 4.170 4.777 4.920 4.647 5.572 5.7175.442 5.731 5.876 5.601
RS35 3⁄8˝ Pitch
No. of Teeth
Pitch Dia.
Outside Dia.
Caliper Dia.
9
1.096 1.255
.880
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 30 32 35 36 40 42 45 48 54 60 70 72 80 84 96
1.214 1.379 1.014 1.331 1.502 1.118 1.449 1.625 1.249 1.567 1.746 1.356 1.685 1.868 1.485 1.804 1.989 1.594 1.922 2.110 1.722 2.041 2.231 1.832 2.160 2.352 1.960 2.278 2.472 2.071 2.397 2.593 2.197 2.516 2.713 2.309 2.635 2.833 2.435 2.754 2.953 2.548 2.873 3.073 2.673 2.992 3.194 2.786 3.111 3.313 2.911 3.230 3.434 3.025 3.349 3.553 3.149 3.588 3.793 3.388 3.826 4.032 3.626 4.183 4.392 3.979 4.303 4.511 4.103 4.780 4.990 4.580 5.018 5.229 4.818 5.376 5.588 5.173 5.734 5.946 5.534 6.449 6.664 6.249 7.165 7.380 6.965 8.358 8.575 8.158 8.597 8.814 8.397 9.552 9.770 9.352 10.029 10.247 9.829
19.102 19.467 18.702 112 22.284 22.651 21.884
15.282 15.573 14.969 112 17.827 18.121 17.515
11.461 11.680 11.261 112 13.371 13.590 13.171
218
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