The Renthal Twinring rear sprocket is designed for dirt bike riders who want dependable chain drive performance with less maintenance. Part number 1500-520-49GPBU combines a hardened steel outer chain ring with a lightweight aluminum inner section to create a durable dual-material sprocket for motocross and off-road use. The 49-tooth configuration is intended for compatible 520 chain applications.
The outer chain ring is heat-treated at 392°F before being permanently fitted to the Renthal Ultralight aluminum inner. This bonded construction helps provide the wear resistance of hardened steel at the chain contact surface while retaining the weight-conscious design of an aluminum carrier. The result is a practical balance of durability, reduced rotating mass, and long-term performance for demanding riding conditions.
This blue Renthal Twinring rear sprocket fits select Yamaha WR250F, WR450F, YZ250F, and YZ450F models from 2009 through 2011. Verify the motorcycle year, model, chain size, tooth count, and sprocket profile before ordering. This product is offered as a compatible aftermarket component and is not affiliated with or endorsed by Yamaha.

Features:

• Dual-material construction: Combines a hardened steel outer chain ring with a lightweight aluminum inner section


• Permanent bonded design: Outer ring is heat-treated at 392°F before being fitted to the aluminum inner for lasting assembly integrity


• 520 chain compatibility: Designed for compatible powersports drivetrains using a 520 chain


• 49-tooth configuration: Provides the tooth count specified for this rear sprocket application


• Motocross and off-road use: Built for demanding dirt bike riding conditions


• Vehicle compatibility: Fits select 2009–2011 Yamaha WR250F, WR450F, YZ250F, and YZ450F models