80BS57 Sprocket With 1-3/8" Finished Bore Roller Chain Breakers the 3TA torque arm handles

the 3TA torque arm handles the reaction torque from your size 3 gearbox

Sprocket Size: 80R60

06B27H sprockets with a stock bore comes with the standard 12 millimeter inside diameter hole with no key-way or set screws and can be easily machine bored to custom sizes

This 50H34 sprocket is a durable

Frame Opening (A): 2-3/8"

80BS57 Sprocket With 1-3/8" Finished Bore Roller Chain Breakers the 3TA torque arm handlesThis 80BS57 sprocket features a 1 3 8" finished bore including a key way and two setscrews. It is a durable, high quality, and precision 57 tooth sprocket that fully meets all ANSI Standards which, insures proper contact between the #80 roller chain and sprocket thus preventing premature wear or breakage. This sprocket is also black oxide coated which increases resistance to the environment and will prevent early rust build up. We also offer stock