Vortex 635ZR-37 Red Aluminum 37-Tooth Rear Sprocket

The Vortex 635ZR-37 is a 37-tooth aluminum rear sprocket finished in a vibrant red anodized coating, designed for motorcycles running a 635-pitch chain. Built to Vortex's exacting standards, this sprocket delivers the precision and durability that racers and performance street riders demand.

Vortex aluminum rear sprockets are crafted from high-grade aluminum alloy and feature a patented tooth profile that reduces wear on both the sprocket and chain, extending the overall life of your drivetrain. The hard anodized finish adds corrosion resistance while keeping weight to a minimum — a key advantage over heavier steel alternatives.

Key Features:

• 37-tooth rear sprocket — ideal for tuning acceleration characteristics vs. stock gearing
• 635 chain pitch compatible
• Red hard anodized finish for corrosion resistance and aggressive styling
• Lightweight aluminum construction reduces rotational mass for improved throttle response
• Vortex patented tooth design increases sprocket and chain longevity
• Precision-manufactured to tight tolerances for smooth, quiet operation

Changing rear sprocket tooth count allows riders to fine-tune their final drive ratio — a lower tooth count compared to stock yields improved top-end speed, while a higher count sharpens low-end acceleration. The 635ZR-37 is a popular choice for riders seeking a performance-oriented gearing adjustment with a quality, race-proven component.