Renthal UltraLight Rear Sprocket REN150U-520-50GBHA for Yamaha YZ125, YZ250F, YZ450F and WR Models

Renthal UltraLight Rear Chainwheels are CNC machined from 7075 T6 aluminum to extremely tight tolerances, 66% lighter than steel. Computer engineered and tested to ensure a precise fitment, concentricity and load dispersion with tooth profiling to provide maximum power transfer. A combination of high strength base material, cutting edge manufacturing methods and exceptional hardwearing surface treatments its clear to see why Renthal's light weight all aluminum rear sprockets can be found on the rear wheels of many factory race team machines.

The Renthal UltraLight Rear Sprocket is engineered for powersports riders who want reduced rotating weight, dependable strength, and efficient power transfer. Part number REN150U-520-50GBHA features a 50-tooth configuration for 520 chain applications and is designed for select Yamaha YZ, YZ-F, YZ-FX, and WR-F models. Its precision-machined profile supports accurate fitment and consistent drivetrain performance.

Manufactured from high-strength 7075-T6 aluminum, this Renthal rear sprocket is CNC machined to tight tolerances for reliable concentricity, precise tooth alignment, and balanced load distribution. Compared with conventional steel sprockets, the UltraLight design is approximately 66% lighter, helping reduce unsprung and rotating mass. Carefully developed tooth profiling promotes smooth chain engagement and efficient transfer of engine power to the rear wheel.

A durable hard-anodized surface treatment helps protect the sprocket from wear during demanding riding conditions while maintaining a clean, professional appearance. Computer engineering and testing support consistent performance across motocross, off-road, and competition applications. The combination of lightweight construction, high-strength material, and precision manufacturing makes the Renthal UltraLight rear sprocket a practical upgrade for riders seeking responsive handling and dependable drivetrain service.

Fitment includes select 1999-2024 Yamaha YZ125, YZ125X, YZ250, YZ250F, YZ250FX, YZ450F, YZ450FX, WR250F, and WR450F applications. Confirm the exact motorcycle model, year, chain size, tooth count, and mounting configuration before installation.

What's Included

One Renthal UltraLight rear sprocket, part number REN150U-520-50GBHA.

Features:

• 7075-T6 aluminum construction provides a strong, lightweight alternative to steel rear sprockets.
• UltraLight design reduces rotating and unsprung weight by approximately 66% compared with steel.
• CNC machining supports precise fitment, concentricity, and consistent load dispersion.
• Computer-engineered tooth profiling promotes efficient power transfer and smooth chain engagement.

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: false
Units Per Sku: 1