Vortex 491ZK-37 Aluminum Rear Sprocket 520 Pitch 37-Tooth Black

The Vortex 491ZK-37 is a 37-tooth, 520-pitch aluminum rear sprocket finished in a striking black anodize. Engineered for performance-minded motorcycle riders, this sprocket delivers a significant weight reduction over stock steel units while maintaining the durability and precision that Vortex Racing is known for.

Key Features:

• Material: CNC-machined aerospace-grade aluminum construction for reduced rotational mass
• Finish: Black anodized for corrosion resistance and a clean, aggressive appearance
• Tooth Count: 37 teeth — ideal for fine-tuning final drive ratios for improved acceleration
• Chain Pitch: 520 pitch compatibility
• Unique tooth profile: Vortex patented tooth design promotes even wear and extends sprocket service life
• Precision manufactured to tight tolerances for smooth, quiet chain engagement

Vortex aluminum rear sprockets are a popular upgrade for riders looking to shed unsprung weight and dial in their gearing. The 491ZK-37 is part of Vortex's extensive 491-series rear sprocket lineup, available in multiple tooth counts and finish options to suit a wide range of applications and riding styles.