
RFX Pro Series Elite Aluminum Sprocket - 520 (Manufacturer part number: FXRS 50-42 99OR): a sprocket designed for riders who demand lightweight and durability on muddy terrains as well as on the road. CNC machined from 7075 aluminum and anodized orange, it features 42 teeth with a 520 pitch to fit standard transmissions in the category.
Designed to withstand the rigors of racing and off-road outings, this Pro Series Elite sprocket focuses on a geometry engineered to reduce weight without sacrificing torsional strength. Available in brand-specific color codes, it also fits common maintenance configurations. Frequently associated models include: TRIUMPH TF 450‑X (2026), DUCATI DESMO 450 MX (2026), and STARK FUTURE VARG EX (2026).