The RENTHAL UltraLight 518U aluminum sprocket is designed for motocross riders who want to reduce unsprung mass without sacrificing reliability. CNC machined in Manchester from 7075 T6 aluminum, this sprocket features a profiled tooth design and a mud-resistant design aimed at minimizing the accumulation of dirt and gravel between the teeth.

• Material: 7075 T6 aluminum (CNC machining)
• Color: black
• Number of teeth: 50
• Chain pitch: 420
• Type: standard, toothed profiling for optimized power transfer
• Weight: up to 66% lighter than steel (ultra-light construction)

The tooth geometry and controlled concentricity allow for good load distribution and precise engagement with the sprocket. Ideal for motocross practice, this sprocket fits 420 transmissions and is suitable for two-stroke machines and small displacements requiring a lightweight and durable part.

Common compatibilities:

• KTM 65 SX (2025 - 65 cm³)
• GAS GAS MC 65 (2025 - 65 cm³)

Replace your sprocket to gain agility and limit mud accumulation on the transmission while maintaining a competition-level manufacturing quality.