Renthal Ultralight Rear Sprocket 50T Silver 131U-520-50GBSI

Shaving unsprung weight off your Yamaha directly improves handling responsiveness and acceleration—the Renthal Ultralight 50T rear sprocket delivers a measurable advantage in both stock and modified builds. At 66% lighter than steel without sacrificing durability, this CNC-machined 7075-T6 aluminum sprocket maintains consistent power transfer even in muddy trail conditions, thanks to its self-cleaning tooth grooves that prevent debris buildup. If you're running a tight gear ratio or optimizing your bike's overall performance envelope, this is a precision upgrade that works.

• Material: 7075-T6 aluminum
• Tooth Count: 50T
• Chain Size: 520
• Weight: 0.81 lbs
• Finish: Silver anodized
• Position: Rear wheel
• Self-cleaning grooves: Yes
• Installation: Bolt-on
• Fitment: Yamaha YZ125 (1980–1998), YZ250 (1980–1998), YZ400F (1998), WR200R (1992), WR250Z (1991–1997), WR400F (1998), WR500Z (1992–1993), IT465 (1981–1982)