RFX Race 12 Teeth Gearbox output pinionRef : RFX00561A / 1123288002

RFX Race Sprocket 12 Teeth (manufacturer part number: FXFS 55-12 55ST) — front sprocket for motocross use, CNC machined from alloy steel and treated for high wear resistance. Designed for small displacement bikes and off-road machines requiring transmission precision and reliability between the gearbox and the rear wheel.

This RFX sprocket features a short tooth design with 12 teeth in pitch 415, silver finish, standard version. The CNC manufacturing ensures tight tolerances for uniform chain contact, while the surface treatment (case hardening) increases both the core and surface hardness.

• Color: Silver
• Material: Alloy Steel
• Number of Teeth: 12 (sprocket)
• Chain Pitch: 415
• Version: Standard
• Drilling/lightening present on some models to reduce rotating mass

Ideal for motocross riders and setups on 50cc bikes (e.g., KTM 50 SX PRO JUNIOR LC, KTM 50 SX MINI ADVENTURE GS, KTM 50 SX), this sprocket easily integrates into compatible transmissions. Replace it during maintenance to maintain clean gearing and ensure a smooth-running chain.