The Renthal UltraLight Rear Chainwheel is a CNC-machined rear sprocket made from 7075 T6 aluminum. Its lightweight aluminum construction is designed to reduce weight compared with steel while maintaining strength for powersports applications. The sprocket features computer-engineered tooth profiling intended to support precise fitment, concentricity, load dispersion, and efficient power transfer.
This silver, 51-tooth, 520-size rear grooved sprocket uses high-strength base material, precision manufacturing methods, and a hardwearing surface treatment. Manufacturer part number: 131U-520-51GBSI. Vendor part number: 131U-520-51GBSI.
Fitment includes 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 motorcycle model and year before ordering.
Features:
- Construction: CNC machined from 7075 T6 aluminum
- Weight design: 66% lighter than steel according to the manufacturer
- Tooth count: 51 teeth
- Chain size: 520
- Finish: Silver
- Tooth profile: Computer engineered for power transfer, fitment, concentricity, and load dispersion
- Fitment: 1998 Yamaha WR400F; 1998 Yamaha YZ400F; 1997 and 1998 Yamaha YZ125; 1997, 1998, 1994, 1995, and 1996 Yamaha YZ250; and 1993 Yamaha YZ125
- Manufacturer part number: 131U-520-51GBSI
- Vendor part number: 131U-520-51GBSI
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