Vortex 317V4-42 V4 Aluminum Rear Sprocket 42-Tooth

The Vortex 317V4-42 is a 42-tooth aluminum rear sprocket built on Vortex Racing's latest V4 sprocket platform. The V4 design represents a meaningful evolution of Vortex's aluminum sprocket lineup, delivering a 10–15% reduction in weight over the previous generation without sacrificing structural integrity, thanks to a refined patterning approach and machined faces on both sides.

Machined from 7075 T6 billet aluminum, this sprocket offers a significant weight advantage over steel alternatives, reducing rotating mass for improved throttle response, acceleration, and deceleration. A clear coat finish is applied to the silver aluminum surface before tooth cutting, helping prevent oxidation while giving the sprocket the iconic two-tone machined look Vortex is known for.

Key Features:

• V4 generation design — 10–15% lighter than prior Vortex aluminum sprocket series
• 7075 T6 billet aluminum construction for maximum strength-to-weight ratio
• 42-tooth rear sprocket
• Patented Vortex sprocket tooth geometry for optimized chain engagement and longevity
• Clear coat finish applied pre-cut for oxidation resistance and two-tone machined appearance
• Manufactured in the USA to race-proven tolerances
• Designed for road racing, track day, and high-performance street applications

Vortex recommends cleaning the chain and sprocket every 300–600 miles on street applications to maximize drivetrain life. Aluminum sprockets perform best when chain tension and cleanliness are properly maintained.