Vortex 825ZKV4-42 VTX Aluminum Rear Sprocket Pitch Sprockets - 42T 520

The Vortex 825ZKV4-42 is a high-performance 42-tooth aluminum rear sprocket from Vortex Racing's VTX series, designed for 520 pitch chain applications. Precision CNC-machined from lightweight 7075-T6 aluminum, this sprocket delivers an excellent strength-to-weight ratio over stock steel sprockets while maintaining durability under demanding riding conditions.

Key Features:

• Material: CNC-machined 7075-T6 aluminum for reduced unsprung weight
• Tooth Count: 42 teeth
• Chain Pitch: 520
• Series: VTX (Z-series aluminum sprocket)
• Hard anodized finish for corrosion resistance and extended wear life
• Precision tooth profile engineered for smooth, quiet chain engagement
• Direct OEM-style fitment — no modifications required
• Manufactured to tight tolerances for consistent, reliable performance

The Vortex VTX aluminum rear sprocket is a popular upgrade for sport bike and motorcycle riders looking to reduce rotating mass and fine-tune their final drive gearing. Vortex Racing is a trusted name in the powersports industry, known for producing competition-grade drivetrain components used on both the street and track.