
RFX Race Sprocket 12 Teeth – Manufacturer Ref: FXFS 50-12 55ST
Designed for 520 transmissions, this RFX front sprocket features a robust construction intended for quad, motocross, and roadster applications. CNC machined from alloy steel, it is case-hardened and tempered (≈ 60 Rockwell) to provide high wear resistance and longevity on the chain and teeth. It has a subtle silver finish and includes lightweight holes on certain models to reduce rotating mass.
This sprocket is suitable for transmissions looking for a race-quality original part while remaining adaptable for off-road or road use. It may fit machines such as STARK FUTURE VARG EX (2026), HUSQVARNA FE 501 (2025), or KTM 500 EXC-F SIX DAYS (2025) when installation requires a 12-tooth sprocket in 520 — always check compatibility and spacing before installation.
Ensure a careful installation and a properly adjusted chain to preserve the lifespan of the sprocket and transmission. Manufacturer reference: FXFS 50-12 55ST.