Vortex 254ZK-42 Aluminum Rear Sprocket 520 Pitch 42-Tooth

The Vortex 254ZK-42 is a lightweight 520-pitch, 42-tooth aluminum rear sprocket engineered for performance motorcycle applications. Machined from a specially formulated aluminum alloy to Vortex's exacting standards, this sprocket delivers a significant weight reduction over OEM steel sprockets, reducing rotating mass for improved throttle response and drivetrain efficiency.

Key Features:

• 520 Pitch — Designed for 520-series chain applications
• 42 Teeth — Stock-replacement tooth count for balanced acceleration and top-end performance
• Lightweight Aluminum Construction — Specially formulated alloy per Vortex specifications for maximum strength-to-weight ratio
• 100% CNC Manufactured in the USA — Precision machined to tight tolerances for a perfectly concentric fit and smooth power delivery
• Anodized Finish — Corrosion-resistant anodized coating applied before cutting, producing Vortex's signature two-tone machined appearance
• Patented Unique Tooth Design — Vortex's proprietary tooth profile increases sprocket longevity and minimizes chain wear
• ZK Bolt Pattern — Specific carrier/bolt pattern configuration for correct model fitment

Vortex aluminum sprockets are the preferred choice for road racing, motocross, flat track, and street performance riders who demand reduced rotating mass and faster acceleration. For maximum service life, maintain chain cleanliness and proper tension every 300–400 miles.