Vortex 840AZB-39 Aluminum Rear Sprocket Black/Silver Chain Sprockets - 39T 530

The Vortex 840AZB-39 is a precision-engineered aluminum rear sprocket designed specifically for BST aftermarket wheels. This 39-tooth sprocket features a lightweight construction that reduces rotating mass, helping to transfer more power to the pavement for improved acceleration and performance.

Key Features:

• 100% CNC manufactured in the USA from specially formulated aluminum alloy per Vortex specifications
• Black anodized finish with silver machined accents for corrosion resistance and distinctive styling
• Unique patented tooth design increases sprocket longevity and provides perfected chain hold and release
• Lightweight construction reduces unsprung weight for better handling and acceleration
• 39-tooth configuration for 530 pitch chain
• Sprocket dimensions: 5 bolt holes (10mm) with 100mm pitch circle diameter (PCD) and 76mm inner diameter

Vortex Racing has been manufacturing top-quality racing components since 1995, and their aluminum sprockets are the racer's choice for combining durability with weight savings. This sprocket is engineered for high-performance applications where every ounce matters.