Vortex 921AZOV4-40 Aluminum Rear Sprocket 40T

The Vortex 921AZOV4-40 is a high-performance 40-tooth aluminum rear sprocket engineered for riders who demand precision, reduced unsprung weight, and consistent power delivery. Vortex sprockets are a trusted choice among street riders and racers alike, manufactured to exacting tolerances for a direct, reliable fit.

Key Features:

• 40-Tooth Configuration – Optimized gearing for balanced acceleration and top-speed performance
• Aircraft-Grade Aluminum Construction – Significantly lighter than steel alternatives, reducing unsprung rotational mass
• Hard Anodized Finish – Provides corrosion resistance and extended wear life
• CNC Machined – Precision cut for consistent tooth profile, smooth chain engagement, and reduced drivetrain wear
• Direct OEM Replacement Geometry – Designed to install using stock hardware with no modifications required
• Lightening Cuts – Strategic material removal further reduces weight without sacrificing structural integrity

Vortex is an industry-recognized brand in the powersports aftermarket, offering sprockets that meet or exceed OEM specifications. The 921AZOV4-40 is an ideal upgrade for riders looking to fine-tune their gearing or replace a worn rear sprocket with a premium, lightweight option.