Renthal 257-520-13GP 13-Tooth Front Sprocket for Yamaha YZ125 (257--520-13GP)

Upgrade the drivetrain of your Yamaha YZ125 with the RENThal 257-520-13GP 13-tooth front sprocket. Designed for demanding motocross and off-road riding, this replacement sprocket combines precision CNC machining with durable nickel chromium steel construction to deliver dependable performance and long service life. The sprocket is engineered for compatible Yamaha YZ125 applications and provides a reliable fit for maintaining proper chain and drivetrain operation.
CNC-machined from case-hardened and core-refined 655M13 nickel chromium steel, the RENThal 257-520-13GP is built to withstand repeated acceleration loads, abrasive riding conditions, and demanding track use. Its hardened outer surface helps resist tooth wear while the refined core provides strength through the sprocket body. This construction supports consistent power transfer and helps extend service life compared with standard replacement sprockets.
Self-cleaning mud grooves are machined into each tooth to help prevent mud and debris from building up between the chain and sprocket. By reducing contamination at the tooth contact points, the grooves help maintain smoother chain engagement and improve wear resistance in muddy or dirty conditions. An ultralight design reduces rotating weight by approximately 10 to 15 percent, helping support responsive acceleration and efficient drivetrain performance without sacrificing durability.
Choose the RENThal 257-520-13GP when replacing a worn front sprocket or servicing the final drive on a compatible Yamaha YZ125. For best results, inspect the chain and rear sprocket during installation and replace worn drivetrain components as needed to promote even wear and reliable performance.

Features:

• Brand: RENThal

• Part Number: 257-520-13GP

• Application: Yamaha YZ125

• Tooth Count: 13-tooth front sprocket

• Material: CNC-machined 655M13 nickel chromium steel

• Construction: Case-hardened and core-refined for strength and wear resistance

• Mud Management: Self-cleaning grooves at each tooth help prevent debris buildup

• Weight Design: Ultralight construction provides approximately 10 to 15 percent weight savings

Ships from Parts Unlimited.