Page 698 - 2021-22 Auto Performance_Circle Track
P. 698
Professional Series Quick-Change Gears
Gears are aircraft-grade
steel for maximum strength.
Each gear has a shaved
and run out, and is broached
for a 10-spline shaft. A 5-step
heat-treating process yields max-
imum gear life for high-stress applications.
Sportsman Series Quick-Change Gears
A quality gear priced for the
sportsman racer! Unlightened
Sportsman Series 10-spline gears are CNC-crown hobbed from 8620 material, then
Gear Set No.
SCS01 SCS02 SCS05 SCS15 SCS15K SCS26 SCS06 SCS25 SCS12 SCS07 SCS07K SCS17 SCS08K SCS08 SCS19 SCS09K SCS09 SCS11 SCS03 SCS13 SCS18 SCS04K SCS04 SCS20 SCS22 SCS16 SCS10 SCS34 SCS14 SCS14K SCS35 SCS32K SCS24 SCS36 SCS37 SCS23 SCS21 SCS27 SCS43 SCS28 SCS29 SCS30 SCS41 SCS31 SCS33K SCS30K
4.11 Ring and Pinion (9-37 Teeth)
Low High
4.11 4.11 3.96 4.26 3.94 4.28 3.90 4.33 3.85 4.38 3.83 4.41 3.78 4.46 3.74 4.52 3.68 4.58 3.63 4.64 3.58 4.69 3.55 4.76 3.49 4.83 3.48 4.85 3.45 4.89 3.42 4.93 3.39 4.97 3.35 5.04 3.31 5.10 3.29 5.14 3.25 5.19 3.21 5.26 3.18 5.31 3.16 5.34 3.12 5.41 3.08 5.48 3.04 5.55 3.00 5.63 2.95 5.72 2.93 5.76 2.91 5.80 2.87 5.89 2.83 5.96 2.80 6.04 2.78 6.07 2.74 6.16 2.69 6.28 2.66 6.35 2.63 6.42 2.60 6.49 2.57 6.58 2.53 6.67 2.49 6.77 2.46 6.85 2.43 6.94 2.37 7.12
No. of Teeth
21/21 27/28 24/25 19/20 15/16 27/29 23/25 20/22 26/29 23/26 21/24 19/22 17/20 22/26 21/25 25/30 19/23 22/27 25/31 20/25 19/24 18/23 24/31 20/26 19/25 24/32 20/27 19/26 23/32 20/28 17/24 23/33 20/29 17/25 23/34 18/27 17/26 22/34 16/25 19/30 15/24 16/26 17/28 21/35 16/27 15/26
4.86 Ring and Pinion (7-34 Teeth)
Low High
4.86 4.86 4.68 5.04 4.66 5.07 4.61 5.12 4.56 5.18 4.52 5.22 4.47 5.28 4.42 5.35 4.36 5.42 4.30 5.49 4.23 5.54 4.19 5.63 4.13 5.71 4.11 5.75 4.08 5.78 4.05 5.83 4.01 5.88 3.96 5.97 3.92 6.03 3.89 6.08 3.85 6.13 3.80 6.21 3.76 6.28 3.74 6.32 3.69 6.39 3.65 6.48 3.60 6.56 3.55 6.65 3.50 6.76 3.47 6.81 3.44 6.86 3.39 6.97 3.35 7.04 3.30 7.15 3.29 7.18 3.24 7.29 3.18 7.43 3.15 7.51 3.11 7.59 3.08 7.67 3.04 7.77 2.99 7.89 2.95 8.00 2.91 8.10 2.88 8.20 2.80 8.42
Gear Set No.
SCS101
SCS102 SCS1015K SCS1026 SCS106 SCS1025 SCS1012 SCS107 SCS107K SCS1017 SCS108K SCS108 SCS1019 SCS109K SCS109 SCS1011 SCS103 SCS1013 SCS1018 SCS104K SCS104 SCS1020 SCS1022 SCS1016 SCS1010 SCS1034 SCS1014 SCS1014K SCS1035 SCS1032K SCS1024 SCS1036 SCS1037 SCS1023 SCS1043 SCS1028 SCS1029 SCS1041 SCS1031 SCS1033K
4.11 Ring and Pinion (9-37 Teeth)
Low High
4.11 4.11 3.96 4.26 3.85 4.38 3.83 4.41 3.78 4.46 3.74 4.52 3.68 4.58 3.63 4.64 3.58 4.69 3.55 4.76 3.49 4.83 3.48 4.85 3.45 4.89 3.42 4.93 3.39 4.97 3.35 5.04 3.31 5.10 3.29 5.14 3.25 5.19 3.21 5.26 3.18 5.31 3.16 5.34 3.12 5.41 3.08 5.48 3.04 5.55 3.00 5.63 2.95 5.72 2.93 5.76 2.91 5.80 2.87 5.89 2.83 5.96 2.80 6.04 2.78 6.07 2.74 6.16 2.63 6.42 2.60 6.49 2.57 6.58 2.49 6.77 2.46 6.85 2.43 6.94
No. of Teeth
21/21 27/28 15/16 27/29 23/25 20/22 26/29 23/26 21/24 19/22 17/20 22/26 21/25 25/30 19/23 22/27 25/31 20/25 19/24 18/23 24/31 20/26 19/25 24/32 20/27 19/26 23/32 20/28 17/24 23/33 20/29 17/25 23/34 18/27 16/25 19/30 15/24 17/28 21/35 16/27
4.86 Ring and Pinion (7-34 Teeth)
Low High
4.86 4.86 4.68 5.04 4.56 5.18 4.52 5.24 4.47 5.28 4.42 5.35 4.36 5.42 4.30 5.49 4.23 5.54 4.19 5.63 4.13 5.71 4.11 5.75 4.08 5.78 4.05 5.83 4.01 5.88 3.96 5.97 3.92 6.03 3.89 6.08 3.85 6.13 3.80 6.21 3.76 6.28 3.74 6.32 3.69 6.39 3.65 6.48 3.60 6.56 3.55 6.65 3.50 6.76 3.47 6.81 3.44 6.86 3.39 6.97 3.35 7.04 3.30 7.15 3.29 7.18 3.24 7.29 3.11 7.59 3.08 7.67 3.04 7.77 2.95 8.00 2.91 8.10 2.88 8.20
696 TRACK
CIRCLE 2021-22
Note: On short tracks such as 1/4, 3/8, and 1/2 mile, the larger gear is most commonly used on top. Example: If you have a 4:11 ring and pinion and you install a #4 gear set with the big gear on top you will have a 5:31 ratio.
• High designation on chart means higher numerical number, but lower
gear ratio.
• Low designation on chart means lower numerical number, but higher gear ratio.
