RFX Pro 13 Teeth Gearbox output pinionRef : RFX01212A / 1123272001

RFX Pro Sprocket 13 Teeth (Manufacturer Reference: FXFS 33-13 99BK)

Designed for motocross, this RFX Pro 13-tooth front sprocket adheres to the machining standards of competition parts. CNC machined from high-strength steel and then carburized to achieve a hardness of approximately 60 Rockwell (HRC), it offers great wear resistance while maintaining tight tolerances on the tooth profile. Its black zinc finish limits superficial corrosion from washing and gives a sleek, technical look to the transmission.

The sprocket is designed for a 520 pitch chain and is available in a mud-resistant version: mud evacuation grooves on both sides and relief holes (when applicable) prevent dirt accumulation and facilitate self-cleaning during motocross outings. A solid choice for those seeking a reliable and low-maintenance part between services.

Main Features:

• Brand: RFX — Pro Series
• Material: carburized steel, black zinc finish
• Teeth: 13 teeth (front sprocket)
• Chain Pitch: 520
• Version: Mud-resistant with self-cleaning grooves and relief holes

Suitable for motocross models such as Yamaha YZ 125 (2026), Fantic XX 125 (2022), and Gas Gas EC 300 F (2015).