Vortex 642CZUV4-42 V4 Aluminum Rear Sprocket 42-Tooth

The Vortex 642CZUV4-42 is a 42-tooth aluminum rear sprocket from Vortex Racing's newest V4 Sprocket line, the next evolution in their acclaimed aluminum sprocket platform. Debuted at the 2026 AIMExpo, the V4 line delivers a 10–15% reduction in weight over the iconic CAT5 design without compromising strength, thanks to a refined structural pattern and machined faces on both sides.

Manufactured in the USA from a specially formulated aerospace-grade alloy per Vortex specifications, this sprocket is 100% CNC machined to tight tolerances. The silver finish includes a clear coating to help prevent oxidation, while the two-tone machined look is achieved by applying the finish before cutting — a Vortex signature detail. The unique patented tooth design extends sprocket longevity and improves power transfer efficiency.

Key Features:

• 42-tooth rear sprocket for fine-tuned gear ratio adjustments
• V4 design — Vortex's newest aluminum sprocket platform (2026)
• 10–15% lighter than the CAT5 design with no sacrifice in strength
• 100% CNC manufactured in the USA from aerospace-grade aluminum alloy
• Silver anodized finish with clear coat to prevent oxidation and corrosion
• Vortex patented tooth geometry for extended sprocket life
• Reduces rotating mass for improved acceleration and throttle response

Aluminum sprockets are the preferred choice for road racing, motocross, flat track, and performance street applications where weight savings translate directly to faster throttle response and improved handling. Pair with a matching-pitch front sprocket and chain for optimal drivetrain performance.