Vortex 642ZB-39 Aluminum Rear Sprocket 39-Tooth 520 Pitch Black

The Vortex 642ZB-39 is a high-performance aluminum rear sprocket designed for motorcycles using 520-pitch chain. This 39-tooth sprocket features Vortex's patented tooth design that maximizes sprocket longevity through optimized load distribution and reduced wear.

Key Features:

• 39 teeth for precise gearing options
• 520 pitch chain compatibility
• 100% CNC machined from lightweight aluminum alloy
• Black PTFE hardcoat anodized finish bonds to aluminum for enhanced durability and reduced friction
• Patented saber tooth groove design increases service life
• Precision machined to tight tolerances for smooth operation
• Significantly lighter than steel sprockets for reduced unsprung weight

Vortex Racing has been manufacturing premium racing components since 1995 and is owned and operated by motorcycle racers. Each sprocket is manufactured in the USA to the highest quality standards and tested on the track with feedback from professional race teams worldwide. The black hardcoat finish provides superior wear resistance compared to standard anodized aluminum sprockets while maintaining the weight advantage over steel.