Vortex 491ZB-42 Black Aluminum 42-Tooth 520-Pitch Rear Sprocket

The Vortex 491ZB-42 is a 42-tooth, 520-pitch aluminum rear sprocket finished in a satin black anodized coating for a clean, corrosion-resistant look. Designed for performance-oriented street and track riders, this sprocket is part of Vortex Racing's proven 491-series rear sprocket lineup.

Vortex Racing is a U.S.-based manufacturer with over 15 years of experience producing top-quality motorcycle racing components for Motocross, Supercross, Road Racing, Flat Track, and Minibikes. Every sprocket is engineered to the tightest tolerances using premium materials and tested with professional race teams worldwide.

Key Features:

• 42-Tooth / 520-Pitch — bolt-on rear sprocket for 520-chain applications
• Black anodized finish — satin black coating protects against corrosion
• Lightweight aluminum construction — reduces rotating mass for improved acceleration, deceleration, and directional changes
• 100% CNC manufactured in the USA — machined to precise tolerances for concentricity and smooth chain engagement
• Vortex patented tooth design — unique profile increases sprocket longevity and reduces wear
• Specially formulated alloy — material spec developed by Vortex for optimal strength-to-weight ratio

The 491ZB-42 is an ideal replacement or gearing upgrade sprocket, delivering race-proven durability in a lightweight package suited for both track days and spirited street riding.