Vortex 635AZK-39 Aluminum Rear Sprocket 630 Pitch 39-Tooth Black

The Vortex 635AZK-39 is a 39-tooth aluminum rear sprocket designed for 630-pitch chain applications. Built to Vortex Racing's exacting standards, this sprocket delivers a lightweight performance advantage over OEM steel units while maintaining the durability demanded by serious street and track riders.

Key Features:

• 630 Chain Pitch — designed to work with 630-pitch drive chains
• 39 Teeth — stock-replacement or gearing-tuned tooth count for precise drive ratio adjustment
• Aluminum Construction — reduces rotating mass for improved acceleration response and handling feel
• Black Anodized Finish — corrosion-resistant anodizing for long-lasting appearance and protection
• Unique Tooth Design — Vortex patented profile increases sprocket longevity and reduces chain wear
• 100% CNC Manufactured in the USA — precision-machined to tight tolerances for concentricity and quiet operation
• Specially Formulated Alloy — aerospace-influenced aluminum alloy developed to Vortex specifications for optimal strength-to-weight ratio

Vortex Racing rear aluminum sprockets are a trusted choice for riders looking to reduce rotating mass and fine-tune their gearing. The 635AZK-39 is a direct bolt-on replacement that fits applications originally equipped with a 630-pitch chain and sprocket drivetrain.