The RENTHAL UltraLight 518U - 420 sprocket is designed for motocross riders who want to reduce weight without sacrificing precision. CNC machined in Manchester from 7075 T6 aluminum, this sprocket offers rigidity suitable for off-road conditions while remaining ultra-lightweight (up to 66% lighter than steel). Its optimized tooth profile and controlled concentricity allow for a direct power transmission and even distribution of forces.
- Manufacturer part number: 518U-420-49-GPBK
- Brand: RENTHAL
- Material: CNC machined 7075 T6 aluminum
- Color: Black
- Number of teeth: 49
- Chain pitch: 420
- Type: Standard, mud-resistant finish
The "mud-resistant" geometry facilitates the ejection of debris and limits accumulation on the sprocket during muddy runs, a benefit for motocross riders. The surface treatments applied enhance abrasion resistance for increased longevity on demanding terrains. Suitable for small displacement off-road bikes, it fits models such as the KTM 65 SX (2025) and the GAS GAS MC 65 (2025).
