Vortex 840ZKV4-42 VTX Aluminum Rear Sprocket 42-Tooth

The Vortex 840ZKV4-42 is a lightweight 42-tooth aluminum rear sprocket from Vortex Racing's VTX series, engineered for performance motorcycle applications. Vortex is a trusted name in competitive motorsports, manufacturing precision sprockets to exacting tolerances for both street and track use.

Constructed from high-grade aluminum alloy, this sprocket delivers a significant weight savings over stock steel units without sacrificing durability. The hard-anodized finish resists corrosion and wear, extending the service life of the sprocket even under demanding riding conditions.

Key Features:

• 42-tooth rear sprocket for tunable final drive ratio
• Lightweight aluminum alloy construction reduces unsprung weight
• Hard-anodized surface finish for enhanced wear and corrosion resistance
• Precision CNC-machined for accurate tooth profile and consistent chain engagement
• VTX series hub pattern for correct fitment
• Compatible with 520-pitch chain (840 series designation)

Swapping to the Vortex 840ZKV4-42 allows riders to fine-tune their motorcycle's acceleration and top-speed characteristics. A higher tooth count rear sprocket increases low-end torque and acceleration response, making it a popular upgrade for track days and spirited street riding.