RFX 42-tooth aluminum sprocket, pitch 520 Beta EVO125 (FXRS 91-42 99SV)

RFX Pro Series sprockets are CNC machined from 7075 aluminum and feature mud-release grooves for longer chain and sprocket life.

RFX sprockets are color-coded according to motorcycle make, and are also available in standard silver for every motorcycle model.


- CNC-machined in 7075 aluminum
- Mud evacuation grooves for longer crown life
- CAD-designed profile for lighter weight
- Rigid design increases torsional strength
- Tighter tolerances improve performance
- Anodized color
- Different colors available for all models
- Laser-engraved RFX logo