Vortex 438KV4-40 VTX Aluminum Rear Sprocket Pitch Sprockets - 40-Tooth 428

The Vortex 438KV4-40 is a 40-tooth aluminum rear sprocket from Vortex Racing's popular VTX series, designed for motorcycles running a 428 pitch chain. Machined from high-grade 7075-T6 aluminum alloy, this sprocket delivers a significant weight savings over stock steel sprockets without sacrificing durability under demanding street and track conditions.

Key Features:

• 40-Tooth rear sprocket configuration
• 428 chain pitch compatibility
• Constructed from lightweight, high-strength 7075-T6 aluminum alloy
• Hard anodized finish for corrosion resistance and extended wear life
• CNC-machined for precise tolerances and consistent chain engagement
• Significant weight reduction compared to OEM steel sprockets
• Direct bolt-on replacement — no modifications required
• Available in multiple tooth counts for custom gearing setups

Vortex Racing is a trusted name in the powersports and racing communities, known for producing precision-engineered drivetrain components. The VTX aluminum rear sprocket is an excellent upgrade for riders looking to reduce unsprung weight and fine-tune their bike's acceleration and top-speed characteristics.