Vortex 840AZO-39 Aluminum Rear Sprocket 39 Tooth

The Vortex 840AZO-39 is a high-performance aluminum rear sprocket designed for 520 pitch chain applications. Precision-machined from lightweight 7075-T6 aluminum alloy, this 39-tooth sprocket delivers exceptional strength while reducing rotational mass for improved acceleration and handling.

Key Features:

• 39 tooth configuration for optimized gearing
• 7075-T6 aluminum construction for maximum strength-to-weight ratio
• CNC machined for precise tolerances and perfect chain alignment
• Hard anodized finish for superior wear resistance and corrosion protection
• 520 pitch chain compatible
• Self-cleaning mud groove design prevents debris buildup

Vortex sprockets are manufactured to exacting standards and feature their signature CAT5 hard anodizing process, which provides a durable surface that resists wear from aggressive chain contact. The lightweight aluminum construction reduces unsprung weight compared to steel sprockets, allowing for quicker throttle response and improved suspension performance.