RFX Race 13 Teeth Gearbox output pinionRef : RFX01210A / 1123271002

RFX Race front sprocket 13 teeth designed for motocross use, aimed at riders who frequently change their gearing. CNC machined from case-hardened and tempered alloy steel (hardness ~60 HRC), it features tight tolerances for precise engagement and controlled wear on the track. Its silver finish discreetly integrates into the drivetrain while remaining robust against demands.

• Manufacturer reference: FXFS 33-13 55ST
• Brand: RFX
• Number of teeth: 13
• Chain pitch: 520
• Material: Case-hardened alloy steel (hardened to approximately 60 HRC)
• Version: Standard
• CNC machining for controlled tolerances; on certain models in the range, lightweight holes are present to reduce rotating mass.

A 13-tooth front sprocket shortens the gearing: useful for achieving a livelier engine response in the mid-range on technical tracks. Standard fit for 520 chain — check compatibility with your motorcycle before installation.

Compatible motorcycles (examples):

• YAMAHA YZ 125 (2026)
• FANTIC XX 125 (2022)
• GAS GAS EC 300 F (2015)