Vortex 840CZOV4-40 Aluminum Rear Sprocket 40-Tooth CZ Series

The Vortex 840CZOV4-40 is a 40-tooth aluminum rear sprocket from Vortex's popular CZ series, engineered for performance motorcycle applications. Precision-machined from high-strength 7075-T6 aluminum alloy, this sprocket delivers an excellent balance of light weight and durability for street and track use.

Key Features:

• 40 Teeth — optimized gearing for acceleration or top-speed tuning depending on your setup
• 7075-T6 Aircraft-Grade Aluminum construction for a significant weight reduction over steel sprockets
• Hard-anodized finish for corrosion resistance and extended service life
• CNC-machined to tight tolerances for precise chain engagement and smooth power delivery
• Lightening holes throughout the sprocket body further reduce unsprung rotational mass
• Compatible with standard 520 chain pitch (verify fitment with your specific model)
• Direct bolt-on replacement — no modifications required for compatible applications

Vortex rear sprockets are a trusted upgrade for riders seeking improved throttle response and reduced drivetrain weight. The 840CZOV4-40 is designed to OEM bolt patterns and dimensions, making installation straightforward with standard hand tools.