
RFX Pro Series Elite Aluminum Sprocket - 428 (Manufacturer Part No: FXRS 51-49 99BU): a sprocket designed for off-road and intensive motocross sessions. CNC machined from 7075 aluminum, it features a CAD-optimized profile, a blue anodized finish, and the RFX logo laser-etched for a racing touch on your rear sprocket.
Built to withstand mud and demanding terrains, it incorporates mud evacuation grooves that facilitate the passage of dirt and preserve the longevity of the chain and sprocket. Its lightweight construction and tight tolerances provide a precise fit on standard hubs.
Indicative compatibility: suitable for 85cc motocross machines such as KTM 85 SX (2025), Husqvarna TC 85 (2025), and GAS GAS MC 85 (2025). Check the number of teeth and chain pitch during installation to ensure compatibility with your model.