Vortex 423ZK-42 Black 42-Tooth 420-Pitch Aluminum Rear Sprocket

The Vortex 423ZK-42 is a lightweight aluminum rear sprocket featuring a 420 chain pitch and 42 teeth, finished in Vortex's durable black hardcoat anodizing. Precision-engineered for motocross, off-road, and small-displacement motorcycle applications that use 420-pitch drive chains, this sprocket is built to the same exacting standards trusted by professional race teams worldwide.

Key Features:

• 420 Chain Pitch — designed for 420-pitch motorcycle and motocross drive chains
• 42-Tooth rear sprocket for optimized gear ratio performance
• Lightweight aluminum construction — reduces rotating mass for improved acceleration, deceleration, and directional changes
• Black hardcoat (ZK) anodized finish — PTFE-bonded coating bonds to the aluminum surface for enhanced durability and corrosion resistance
• 100% CNC manufactured in the USA to the tightest tolerances
• Specially formulated alloy per Vortex specifications for optimal strength-to-weight ratio
• Vortex patented tooth design — unique geometry engineered for superior chain engagement, hold, and release, increasing sprocket longevity
• Lightening holes reduce overall rotating mass

Vortex Racing has been a trusted name in motorcycle racing components for over 15 years, supplying sprockets to top professional race teams competing in Motocross, Supercross, Road Racing, and Flat Track events. The 423ZK-42 rear sprocket is a direct OEM-style replacement or upgrade for bikes equipped with a 420-pitch chain system.