Renthal Aluminium Ultra-Light Self-Cleaning 121U - 428 SprocketRef : RT00402A / 1075608003

RENTHAL Ultra-Light Mud-Resistant Sprocket 121U - 428 (manufacturer part number: 121U-428-50GPSI) — a sprocket designed for motocross and enduro competition where every gram and every chain rotation counts.

• Material: Machined 7075 T6 aluminum, lightweight and highly durable.
• Number of teeth: 50 teeth (sprocket) — chain pitch 428.
• Mud-resistant profile: Optimized tooth design to shed mud and limit accumulation between chain and sprocket.
• Anodization: Silver finish that hardens the surface and protects the aluminum from abrasion.
• Strategic weight reduction: Machined holes in key areas to decrease mass without compromising rigidity.

Designed for demanding drivetrains, this RENTHAL sprocket combines lightweight construction, mechanical strength, and easy maintenance in muddy conditions. Its profile reduces friction between the chain and sprocket, contributing to smoother transmission and even chain wear. Ideal for setups equipped with a 428 pitch chain, it is particularly suited for motocross bikes and small displacement competition machines where responsiveness and reliability are crucial.

With a sleek aesthetic and precision manufacturing, this sprocket is a popular choice among riders looking to optimize their transmission while maintaining robustness and longevity on muddy tracks.