PBI Transmission Mainshaft Sprocket - 20-Tooth - XL 277-20

A transmission mainshaft sprocket is the critical link between your engine's power and your drivetrain's efficiency. Worn or substandard sprockets introduce slack, missed shifts, and premature chain wear—all of which rob you of consistency on the track or strip. The PBI 20-Tooth XL 277-20 is engineered to eliminate these variables with precision machining and premium materials that handle sustained high-load cycles without compromise.

Built from 8620 chromoly steel and heat-treated for durability, this one-piece sprocket is broached specifically to maximize spline-to-shaft contact, ensuring zero slippage and predictable power delivery. Whether you're dialing in a street bike, drag racer, or custom build, this is the kind of component that separates consistent performance from guesswork.

• 20-tooth configuration
• 530 chain compatible
• 8620 chromoly steel
• Heat-treated throughout
• Broached spline design
• CNC-machined precision
• One-piece construction
• Made in U.S.A.
• Bolt-on installation
• Maximum load bearing