RFX Pro Series Armalite Double Compound (Steel/Aluminium) - 520 SprocketRef : RFX01149A / 1123228006

The RFX Pro Series Armalite 520 sprocket (manufacturer part number: FXRS31-50ALBK) combines lightweight and durability for demanding off-road and roadster riders. Developed and tested by racing teams, its dual-ring design features a CNC-machined 7075-T6 aluminum hub and a high-density steel outer ring to optimize weight and tooth retention.

• Type: Dual Armalite composite sprocket
• Material: 7075 aluminum inner ring, HCS outer ring
• Number of teeth: 50 (pitch 520)
• Color: Anodized black
• Feature: Hex-Drive interface between inner and outer ring for better load transmission and reduced stress on rivets
• Design: Lightweight CAD profile, mud release grooves, and rigid design to limit torsion

Ideal for both motocross and roadster use, this sprocket is designed to withstand demands while reducing unsprung weight and wheel inertia. For installation, follow the standard steps: lift the wheel, remove the chain and worn sprocket, clean the hub, position the new sprocket, apply appropriate thread-locking compound on the bolts, and tighten in a cross pattern to the torque recommended by the manufacturer.

Compatible with models such as YAMAHA YZ 450 F (2026), FANTIC XX 125 (2022), and HONDA FX 650 VIGOR (RD09).