Vortex 920AZB-39 VTX Aluminum Rear Sprocket Pitch Sprockets - 39T 520

The Vortex 920AZB-39 VTX Aluminum Rear Sprocket is a high-performance replacement rear sprocket engineered for motorcycle applications requiring a 39-tooth, 520-pitch configuration. Manufactured by Vortex Racing — a trusted name in competitive and street motorcycle components — this sprocket is precision-machined from lightweight 7075-T6 aluminum alloy for an optimal balance of strength and weight savings over a stock steel sprocket.

Key Features:

• Material: 7075-T6 aircraft-grade aluminum for reduced unsprung weight
• Tooth Count: 39 teeth for tuned acceleration and throttle response
• Chain Pitch: 520 series chain compatible
• Hard anodized finish for corrosion resistance and extended service life
• CNC machined to precise tolerances for smooth, consistent power transfer
• Lightweight design reduces rotating mass, improving overall performance
• Direct OEM-style fitment for straightforward installation

Vortex sprockets are a popular upgrade for riders looking to fine-tune their gearing for track days, sport riding, or street performance. The 39-tooth rear sprocket provides a balance between top-end speed and low-end grunt, making it a versatile choice for a wide range of riding styles.