Vortex 491AZB-39 Aluminum Rear Sprocket 39T

The Vortex 491AZB-39 is a high-performance 39-tooth aluminum rear sprocket engineered for serious sport bike and motorcycle riders seeking improved power transfer and reduced unsprung weight. Manufactured from lightweight 7075-T6 aircraft-grade aluminum with a hard anodized finish, this sprocket delivers exceptional durability while dramatically reducing rotating mass compared to stock steel sprockets.

Key Features:

• 39-tooth rear sprocket for precise gearing customization
• Constructed from 7075-T6 aircraft-grade aluminum for an optimal strength-to-weight ratio
• Hard anodized finish for corrosion resistance and extended service life
• CNC machined to exacting tolerances for perfect chain alignment and smooth engagement
• Significant weight savings over OEM steel sprockets, reducing unsprung and rotating mass
• Compatible with standard O-ring, X-ring, and Z-ring chains
• Direct OEM-replacement bolt pattern for straightforward installation

Vortex sprockets are a popular upgrade for riders who want to fine-tune their final drive ratio for either more top-end speed or improved low-end acceleration. The 491AZB-39 is part of Vortex's proven AZB series, built to meet the demands of track and street riding alike.