RFX Race 13 Teeth Gearbox output pinionRef : RFX01213A / 1123274001

RFX Race Sprocket 13 Teeth — Manufacturer Ref: FXFS 36-13 55ST

Designed for demanding riders, this RFX Race front sprocket is CNC machined from high-strength alloy steel and then carburized to achieve approximately 60 Rockwell, ensuring wear resistance and longevity. Its silver finish and possible lightening holes (depending on the model) reduce rotating mass without compromising strength. Ideal for both Cross and Roadster environments, it is an excellent choice for a 428 pitch transmission.

• Material: carburized steel
• Number of Teeth: 13 teeth (standard version)
• Chain Pitch: 428
• Color: silver
• Machining: CNC with tight tolerances

The 13-tooth sprocket shortens the gearing compared to a larger sprocket, resulting in a more responsive engine acceleration — useful for quick bursts and dynamic riding on varied terrains. Suitable for machines like certain YZ 85, Z 125, or GPR 125 (check specific compatibility based on year and setup). Simple installation as a replacement for the original sprocket; adhere to the torque specifications provided by the manufacturer and maintain the chain for optimal durability.