Common Quick Change Gear Set Ratios

Set Number Number of Teeth Spur Ratio 4:11 R&P 4:11 R&P 4:86 R&P 4:86 R&P
1 21/21 (Winters, Coleman) 1.000 4.11 4.11 4.86 4.86
1 23/23 (Chester) 1.000 4.11 4.11 4.86 4.86
1 27/27 (Quartermaster) 1.000 4.11 4.11 4.86 4.86
1 28/28 (SCS) 1.000 4.11 4.11 4.86 4.86
2 27/28 1.037 3.96 4.28 4.69 5.04
2 26/27 (Coleman) 1.038 3.96 4.26 4.68 5.04
5 24/25 1.042 3.95 4.28 4.67 5.05
5 22/23 (Quartermaster) 1.045 3.93 4.30 4.65 5.08
15 19/20 1.053 3.90 4.33 4.62 5.12
15C 17/18 1.059 3.88 4.35 4.59 5.15
15K 15/16 1.067 3.85 4.38 4.56 5.18
26 27/29 1.074 3.83 4.42 4.52 5.22
26C 27/29 1.074 3.83 4.41 4.52 5.22
26 25/27 (Chester, Coleman) 1.080 3.81 4.44 4.50 5.25
6 23/25 1.087 3.78 4.47 4.47 5.28
6 22/24 (Quartermaster) 1.091 3.77 4.48 4.45 5.30
6 21/23 (Coleman) 1.095 3.75 4.50 4.44 5.32
25 20/22 1.100 3.74 4.52 4.42 5.35
25 19/21 (Quartermaster, Coleman) 1.105 3.72 4.54 4.39 5.37
12 26/29 1.115 3.69 4.59 4.35 5.42
12C 26/29 1.115 3.68 4.58 4.36 5.42
12 24/27 (Chester, Coleman) 1.125 3.65 4.62 4.32 5.47
7 23/26 1.130 3.64 4.65 4.30 5.49
7C, 7Q, 7A, 7K, 7C 21/24 1.143 3.60 4.70 4.25 5.55
17C 20/23 1.150 3.57 4.73 4.23 5.59
17 25/29 1.150 3.54 4.77 4.19 5.64
17 26/30 (Winters) 1.154 3.54 4.76 4.19 5.64
17 19/22 (SCS, Coleman) 1.158 3.55 4.76 4.19 5.63
17A 24/28 1.167 3.52 4.80 4.17 5.67
8C, 8Q, 8A 23/27 1.174 3.50 4.82 4.14 5.71
8K 17/20 1.176 3.49 4.83 4.13 5.71
8 22/26 1.182 3.48 4.88 4.11 5.74
19 21/25 1.190 3.45 5.89 4.08 5.79
9C 20/24 1.200 3.43 4.93 4.06 5.83
9Q, 9A, 9K 25/30 1.200 3.43 4.93 4.05 5.83
9 19/23 1.211 3.40 4.98 4.01 5.88
11 18/22 (Chester, Coleman) 1.222 3.36 5.02 3.98 5.94
11 22/27 1.227 3.35 5.04 3.96 5.95
11C 22/27 1.227 3.35 5.04 3.96 5.95
3 17/21 (Coleman) 1.235 3.32 5.08 3.93 6.00
3 21/26 (Quartermaster) 1.238 3.32 5.09 3.92 6.01
3 25/31 1.240 3.31 5.10 3.92 6.03
13 24/30 (Quartermaster) 1.250 3.29 5.14 3.89 6.07
13 20/25 1.250 3.29 5.14 3.89 6.08
18 23/29 1.261 3.28 5.18 3.85 6.13
18 19/24 (SCS) 1.263 3.25 5.18 3.85 6.13
18C, 18Q, 18A 22/28 1.273 3.23 5.23 3.82 6.19
4C, 4Q, 4A, 4K 18/23 1.278 3.22 5.25 3.80 6.21
20C, 20Q 21/27 1.285 3.20 5.28 3.78 6.25
4 24/31 1.292 3.18 5.31 3.76 6.28
4 17/22 (Coleman) 1.294 3.18 5.32 3.75 6.29
20 20/26 1.300 3.16 5.34 3.74 6.32
20 23/30 (Quartermaster) 1.304 3.15 5.36 3.72 6.34
22 19/25 1.316 3.12 5.41 3.69 6.39
22 22/29 (Quartermaster) 1.318 3.12 5.42 3.68 6.40
16 18/24 1.333 3.08 5.48 3.65 6.48
16 24/32 (SCS) 1.333 3.08 5.48 3.65 6.48
10 20/27 (Quartermaster, SCS) 1.350 3.05 5.55 3.60 6.56
10 17/23 1.353 3.04 5.58 3.58 6.58
10C 22/30 1.364 3.01 5.60 3.55 6.63
34 22/30 (Quartermaster) 1.364 3.01 5.61 3.56 6.62
34 19/26 (SCS) 1.368 3.00 5.63 3.55 6.65
34 16/22 (Chester, Coleman) 1.375 2.99 5.65 3.53 6.68
34 21/29 (Winters) 1.381 2.98 5.68 3.52 6.71
34C, 34Q 21/29 1.381 2.98 5.68 3.52 6.71
14 23/32 1.391 2.95 5.72 3.49 6.76
14C, 14Q, 14A, 14K 20/28 1.400 2.94 5.75 3.47 6.80
35 22/31 (Quartermaster) 1.409 2.92 5.79 3.45 6.84
35 17/24 1.412 2.91 5.80 3.44 6.86
32 19/27 1.421 2.89 5.84 3.42 6.91
35C 21/30 1.429 2.88 5.87 3.40 6.94
32Q, 32A, 32K 23/33 1.435 2.87 5.90 3.39 6.97
32C 16/23 1.438 2.88 5.91 3.38 6.99
24 20/29 1.450 2.83 5.98 3.35 7.05
36 17/25 1.471 2.79 6.04 3.30 7.15
37 21/31 1.476 2.78 6.07 3.29 7.17
37 23/34 (SCS, Coleman) 1.478 2.78 6.07 3.29 7.18
23 16/24 (Chester) 1.500 2.74 6.17 3.24 7.29
23 22/33 1.500 2.74 6.17 3.24 7.29
23 18/27 (SCS) 1.500 2.74 6.17 3.24 7.29
21 21/32 (Quartermaster) 1.524 2.70 6.26 3.19 7.40
21 19/29 1.524 2.70 6.28 3.19 7.41
21 17/26 (SCS) 1.529 2.69 6.28 3.18 7.43
21C, 21Q 15/23 1.533 2.68 6.30 3.17 7.45
27 22/34 1.545 2.66 6.35 3.14 7.51
27 20/31 (Quartermaster) 1.550 2.65 6.37 3.13 7.53
43 16/25 1.563 2.63 6.42 3.11 7.59
28 19/30 1.579 2.60 6.49 3.08 7.57
28C 17/27 1.588 2.59 6.53 3.06 7.72
28Q 22/35 1.591 2.58 6.54 3.05 7.73
29 20/32 (Quartermaster) 1.600 2.57 6.58 3.04 7.77
29 15/24 1.600 2.57 6.58 3.04 7.78
39 18/29 1.611 2.55 6.62 3.02 7.83
30 16/26 1.625 2.53 6.68 2.99 7.80
40 19/31 1.632 2.52 6.71 2.98 7.92
41 17/28 1.647 2.49 6.77 2.95 8.00
41 20/33 (Quartermaster) 1.650 2.49 6.78 2.94 8.01
31 18/30 1.666 2.46 6.85 2.91 8.09
31 21/35 (Winters, SCS) 1.667 2.47 6.85 2.92 8.10
42 15/25 1.667 2.46 6.85 2.92 8.10
33Q 19/32 1.684 2.44 6.92 2.88 8.18
33C, 33K 16/27 1.688 2.43 6.94 2.88 8.20
33 20/34 1.700 2.42 6.99 2.86 8.26
33 17/29 (Chester, SCS) 1.705 2.41 7.01 2.85 8.29
31C, 31A, 31K 14/24 1.714 2.39 7.05 2.83 8.33
31A, 31C 21/36 (Winters, Coleman) 1.714 2.40 7.05 2.84 8.34
30C, 30A, 30K 15/26 1.733 2.37 7.12 2.80 8.42
50C, 50Q 16/28 1.750 2.35 7.19 2.77 8.50
51Q 17/30 1.765 2.33 7.25 2.75 8.57
52Q 18/32 1.778 2.31 7.31 2.73 8.63
53Q 14/25 1.786 2.30 7.34 2.72 8.67
54Q 15/27 1.800 2.28 7.40 2.70 8.74
55Q 16/29 1.813 2.27 7.45 2.68 8.80
57Q 16/30 1.875 2.19 7.71 2.59 9.11

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