Quick Change Gear Chart

10 Spline Quick Change Gear Chart
Find your ring and pinion ratio.
Read down the column to find the final ratio you want.
Look across the row to find the gear set number you need.
Gear Set # Number of Teeth Low Spur
Ratio 		High Spur
Ratio 		4.11 Ring & Pinion 4.86 Ring & Pinion
  Small Large     Low High Low High
1 21 21 1.000 1.000 4.11 4.11 4.86 4.86
2 27 28 1.037 0.964 4.26 3.96 5.04 4.69
5 24 25 1.042 0.960 4.28 3.95 5.06 4.67
15 20 21 1.050 0.952 4.32 3.91 5.10 4.63
26 27 29 1.074 0.931 4.41 3.83 5.22 4.52
6 23 25 1.087 0.920 4.47 3.78 5.28 4.47
25 20 22 1.100 0.909 4.52 3.74 5.35 4.42
12 26 29 1.115 0.897 4.58 3.68 5.42 4.36
7 23 26 1.130 0.885 4.65 3.64 5.49 4.30
17 19 22 1.158 0.864 4.76 3.55 5.63 4.20
8 22 26 1.182 0.846 4.86 3.48 5.74 4.11
19 21 25 1.190 0.840 4.89 3.45 5.79 4.08
9 19 23 1.211 0.826 4.98 3.40 5.88 4.01
11 18 22 1.222 0.818 5.02 3.36 5.94 3.98
3 25 31 1.240 0.806 5.10 3.31 6.03 3.92
13 20 25 1.250 0.800 5.14 3.29 6.08 3.89
18 19 24 1.263 0.792 5.19 3.25 6.14 3.85
4 24 31 1.292 0.774 5.31 3.18 6.28 3.76
20 20 26 1.300 0.769 5.34 3.16 6.32 3.74
22 19 25 1.316 0.760 5.41 3.12 6.39 3.69
16 18 24 1.333 0.750 5.48 3.08 6.48 3.65
10 17 23 1.353 0.739 5.56 3.04 6.58 3.59
34 21 29 1.381 0.724 5.68 2.98 6.71 3.52
14 23 32 1.391 0.718 5.72 2.95 6.76 3.49
35 17 24 1.412 0.708 5.80 2.91 6.86 3.44
32 19 27 1.421 0.704 5.84 2.89 6.91 3.42
24 20 29 1.450 0.690 5.96 2.83 7.05 3.35
36 17 25 1.471 0.680 6.04 2.79 7.15 3.30
37 21 31 1.476 0.677 6.07 2.78 7.17 3.29
23 16 24 1.500 0.667 6.17 2.74 7.29 3.24
21 19 29 1.526 0.655 6.27 2.69 7.42 3.18
27 22 34 1.545 0.647 6.35 2.66 7.51 3.14
43 16 25 1.563 0.640 6.42 2.63 7.59 3.11
28 19 30 1.579 0.633 6.49 2.60 7.67 3.08
29 15 24 1.600 0.625 6.58 2.57 7.78 3.04
39 18 29 1.611 0.621 6.62 2.55 7.83 3.02
30 16 26 1.625 0.615 6.68 2.53 7.90 2.99
40 19 31 1.632 0.613 6.71 2.52 7.93 2.98
41 17 28 1.647 0.607 6.77 2.50 8.00 2.95
31 15 25 1.667 0.600 6.85 2.47 8.10 2.92
33 20 34 1.700 0.588 6.99 2.42 8.26 2.86
31a 21 36 1.714 0.583 7.05 2.40 8.33 2.84
30a 15 26 1.733 0.577 7.12 2.37 8.42 2.80
Note: The gear with the greatest number of teeth placed on the top shaft yields the low ratio
Note: The gear with the smallest number of teeth placed on the top shaft yields the high ratio


6 Spline Quick Change Gear Chart
Find your ring and pinion ratio.
Read down the column to find the final ratio you want.
Look across the row to find the gear set number you need.
Gear Set # Number of Teeth Low Spur Ratio High Spur Ratio 4.11 Ring & Pinion
  Small Large     Low High
1 24 24 1.000 1.000 4.11 4.11
2 23 24 1.043 0.958 4.29 3.94
2A 17 18 1.059 0.944 4.35 3.88
3 23 25 1.087 0.920 4.47 3.78
3B 17 19 1.118 0.895 4.59 3.68
3A 22 25 1.136 0.880 4.67 3.62
4 22 26 1.182 0.846 4.86 3.48
4A 16 19 1.188 0.842 4.88 3.46
5 21 26 1.238 0.808 5.09 3.32
5A 19 24 1.263 0.792 5.19 3.25
6 21 27 1.286 0.778 5.28 3.20
24 20 26 1.300 0.769 5.34 3.16
25 18 24 1.333 0.750 5.48 3.08
7 20 27 1.350 0.741 5.55 3.04
8 20 28 1.400 0.714 5.75 2.94
22 19 27 1.421 0.704 5.84 2.89
9 16 26 1.438 0.696 5.91 2.86
10 15 22 1.467 0.682 6.03 2.80
11 18 27 1.500 0.667 6.17 2.74
12 19 29 1.526 0.655 6.27 2.69
13 15 23 1.533 0.652 6.30 2.68
14 14 22 1.571 0.636 6.46 2.62
15 15 24 1.600 0.625 6.58 2.57
16 16 26 1.625 0.615 6.68 2.53
17 18 30 1.667 0.600 6.85 2.47
18 13 22 1.692 0.591 6.96 2.43
18A 16 28 1.750 0.571 7.19 2.35
19 14 25 1.786 0.560 7.34 2.30
20 15 27 1.800 0.556 7.40 2.28
27 13 24 1.846 0.542 7.59 2.23
28 14 26 1.857 0.538 7.63 2.21
21 17 32 1.882 0.531 7.74 2.18
29 12 23 1.917 0.522 7.88 2.14
26 15 29 1.933 0.517 7.95 2.13
30 20 40 2.000 0.500 8.22 2.06
31 20 41 2.050 0.488 8.43 2.00
32 19 40 2.105 0.475 8.65 1.95
Note: The gear with the greatest number of teeth placed on the top shaft yields the low ratio
Note: The gear with the smallest number of teeth placed on the top shaft yields the high ratio
Note: Speedway Engineering Mini Stock Quick Change Rear Ends are designed to use QC gears up to 1.375" wide.
A #85-051 spacer is required to use standard 1" wide QC gears.

 
For more information about these or any other Speedway Engineering parts
please call our tech line at 1-800 993 8880 7:00am-5: 30pm PST Monday-Friday.