Professional Series Quick-Change Gears Gears are aircraft-grade steel for maximum strength. Each gear has a shaved
Sportsman Series Quick-Change Gears A quality gear priced for the sportsman racer! Unlightened Sportsman Series 10-spline gears are
¿QLVKWRPLQLPL]HEDFNODVK 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. *HDUVKDYHDEODFNR[LGH¿QLVKDQGOLJKWHQHGIDFHVWRUHGXFH URWDWLQJZHLJKWZLWKRXWVDFUL¿FLQJVWUHQJWK
CNC-crown hobbed from 8620 material, then KHDWWUHDWHGDQG5(0¿QLVKHGSULRUWRVKLSPHQW
4.11 Ring and Pinion (9-37 Teeth)
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
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
Gear Set No.
Low
High 4.11 4.26 4.38 4.41 4.46 4.52 4.58 4.64 4.69 4.76 4.83 4.85 4.89 4.93 4.97 5.04 5.10 5.14 5.19 5.26 5.31 5.34 5.41 5.48 5.55 5.63 5.72 5.76 5.80 5.89 5.96 6.04 6.07 6.16 6.42 6.49 6.58 6.77 6.85
SCS101 SCS102
4.11 3.96 3.85 3.83 3.78 3.74 3.68 3.63 3.58 3.55 3.49 3.48 3.45 3.42 3.39 3.35 3.31 3.29 3.25 3.21 3.18 3.16 3.12 3.08 3.04 3.00 2.95 2.93 2.91 2.87 2.83 2.80 2.78 2.74 2.63 2.60 2.57 2.49 2.46 2.43
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)
4.86 Ring and Pinion (7-34 Teeth)
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
Gear Set No.
Low
High 4.11 4.26 4.28 4.33 4.38 4.41 4.46 4.52 4.58 4.64 4.69 4.76 4.83 4.85 4.89 4.93 4.97 5.04 5.10 5.14 5.19 5.26 5.31 5.34 5.41 5.48 5.55 5.63 5.72 5.76 5.80 5.89 5.96 6.04 6.07 6.16 6.28 6.35 6.42 6.49 6.58 6.67 6.77 6.85 6.94 7.12
Low
High 4.86 5.04 5.07 5.12 5.18 5.22 5.28 5.35 5.42 5.49 5.54 5.63 5.71 5.75 5.78 5.83 5.88 5.97 6.03 6.08 6.13 6.21 6.28 6.32 6.39 6.48 6.56 6.65 6.76 6.81 6.86 6.97 7.04 7.15 7.18 7.29 7.43 7.51 7.59 7.67 7.77 7.89 8.00 8.10 8.20 8.42
SCS01 SCS02 SCS05 SCS15
4.11 3.96 3.94 3.90 3.85 3.83 3.78 3.74 3.68 3.63 3.58 3.55 3.49 3.48 3.45 3.42 3.39 3.35 3.31 3.29 3.25 3.21 3.18 3.16 3.12 3.08 3.04 3.00 2.95 2.93 2.91 2.87 2.83 2.80 2.78 2.74 2.69 2.66 2.63 2.60 2.57 2.53 2.49 2.46 2.43 2.37
4.86 4.68 4.66 4.61 4.56 4.52 4.47 4.42 4.36 4.30 4.23 4.19 4.13 4.11 4.08 4.05 4.01 3.96 3.92 3.89 3.85 3.80 3.76 3.74 3.69 3.65 3.60 3.55 3.50 3.47 3.44 3.39 3.35 3.30 3.29 3.24 3.18 3.15 3.11 3.08 3.04 2.99 2.95 2.91 2.88 2.80
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
6.94 2.88 8.20 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. 16/27
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CIRCLE TRACK 2021-22
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