Vortex 251AZBV4-48 CAT5 V4 Aluminum Rear Sprocket 520 Pitch 48-Tooth Blue

The Vortex 251AZBV4-48 is a CAT5 V4 aluminum rear sprocket featuring Vortex's latest V4 design iteration — an evolution of the iconic CAT5 platform that delivers a 10–15% reduction in weight over the standard CAT5 without sacrificing strength. The V4 achieves this through a refined cutout pattern focused on optimal structural integrity, along with machined faces on both sides for a premium finished look. Finished in a blue anodized coating, this 48-tooth, 520-pitch sprocket is built for riders who demand race-level performance on the street or track.

Key Features:

• V4 Design: Next-generation CAT5 platform with 10–15% weight savings over standard CAT5, reducing rotating mass for improved throttle response
• Aerospace-Grade Aluminum: Machined from a specially formulated alloy per Vortex specifications for the ideal balance of strength and weight
• 100% CNC Manufactured in the USA: Precision-machined for consistent fitment and dimensional accuracy
• Patented Saber Tooth Groove Design: Unique tooth geometry increases sprocket longevity and sets Vortex apart from competing designs
• Blue Anodized Finish: Hard anodized surface provides corrosion resistance and a distinctive appearance
• Machined Faces on Both Sides: Clean, symmetrical finish that highlights the V4's structural cutout pattern
• Specs: 520 pitch | 48 teeth | Rear position

Vortex rear sprockets are the preferred choice of racers and performance street riders worldwide. Switching from a heavy OEM steel sprocket to a lightweight Vortex aluminum unit reduces rotating mass and helps put more power to the pavement. The 251AZBV4-48 is designed as a direct replacement or 520 conversion option for compatible Honda applications.