RFX composite double Pro Series Armalite steel alu - 520 49 teeth SprocketRef : RFX01691A / 1123245004

Pro Series Armalite Composite Double Crown Steel Aluminium - 520 49 Teeth by RFX

This double crown is designed for off-road use, combining a 7075-T6 aluminium centre with a HCS steel outer ring to reduce weight while extending the lifespan of the teeth. The Hex-Drive interface maximises power transmission between the two rings and alleviates stress on the rivets. Designed and tested at the highest level by the racing teams of the world and British championships, it features a CAD profile and mud-release grooves for intensive Enduro and Cross use.

Design and Materials

• CNC 7075 aluminium inner ring for a lightweight and durable centre, facilitating wheel handling.
• Outer ring made from high-density carbon special HCS steel for improved tooth retention and delayed wear.
• Hex-Drive interface between the rings for direct power transmission and reduced stress on the rivets.
• CAD-developed profile to optimise weight without compromising strength.
• Stiff design increasing torsional resistance to maintain the profile under high stress.

Practicality and Features

• Two-crown design offering a durability/weight compromise suitable for demanding off-road motorcycles.
• New style of mud-release grooves to limit clogging and reduce wear in muddy conditions.
• Assembly instructions included, indicating the use of blue Loctite and tightening according to the user manual to ensure secure fastening.

Benefits

• Manufacturer reference: FXRS61-49ALBK
• Type Cross, Enduro and Cross universe

Examples of Compatible Motorcycles

• BETA RR 480 4T X-PRO (2027 - 480 cm3)
• BETA RX 450 4T (2027 - 450 cm3)
• BETA RR 430 4T X-PRO (2027 - 430 cm3)

Complete list of compatible motorcycles available in the dedicated section below