The Renthal UltraLight Rear Chainwheel is a CNC-machined aluminum rear sprocket designed for powersports applications. It is manufactured from 7075 T6 aluminum and engineered for precise fitment, concentricity, and load dispersion. Its tooth profile is designed to support efficient power transfer, while the hardwearing surface treatment helps provide durability in demanding riding conditions.
This silver 520-50P rear grooved sprocket has 50 teeth and is identified by manufacturer part number 131U-520-50GBSI. The vendor part number is 131U-520-50GBSI. Renthal states that its UltraLight aluminum rear sprockets are 66% lighter than steel equivalents and are used on the rear wheels of factory race team machines.
Fitment includes the 1998 Yamaha WR400F; 1998 Yamaha YZ400F; 1997 and 1998 Yamaha YZ125; 1997, 1998, 1994, 1995, and 1996 Yamaha YZ250; and 1993 Yamaha YZ125. Verify the model year, motorcycle application, chain size, tooth count, and sprocket specifications before installation.
Features:
- Material: CNC-machined 7075 T6 aluminum construction
- Design: UltraLight rear chainwheel with a grooved sprocket design
- Tooth Count: 50 teeth
- Chain Size: 520
- Finish: Silver
- Engineering: Computer engineered and tested for precise fitment, concentricity, and load dispersion
- Tooth Profile: Designed to support maximum power transfer
- Fitment: Fits select 1993–1998 Yamaha YZ125, YZ250, WR400F, and YZ400F applications listed in the product data
- Part Number: 131U-520-50GBSI
Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Unknown
Part Type: powersports
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: t
Units Per Sku: 1
Fitment:
1993 Yamaha YZ125 Base
1994 Yamaha YZ125 Base
1994 Yamaha YZ250 Base
1995 Yamaha YZ125 Base
1995 Yamaha YZ250 Base
1996 Yamaha YZ125 Base
1996 Yamaha YZ250 Base
1997 Yamaha WR250 Base
1997 Yamaha YZ125 Base
1997 Yamaha YZ250 Base
1998 Yamaha WR400F Base
1998 Yamaha YZ125 Base
1998 Yamaha YZ250 Base
1998 Yamaha YZ400F Base