Vortex 251AZBV4-45 CAT5 520 Aluminum Rear Sprocket 45-Tooth Blue

The Vortex 251AZBV4-45 is a CAT5 aluminum rear sprocket featuring a 45-tooth count and 520 chain pitch in a vibrant blue anodized finish. Machined from a specially formulated aerospace-grade aluminum alloy to Vortex's own specifications, this sprocket delivers a significant weight savings over OEM steel units, reducing rotating mass for improved throttle response and handling.

Key Features:

• 45 Teeth / 520 Pitch — direct OEM replacement or suitable 520-size conversion
• Lightweight CAT5 aluminum construction — reduces rotating mass vs. stock steel sprockets
• 100% CNC manufactured in the U.S.A. — precision machined to tight tolerances
• Specially formulated alloy — developed to Vortex's proprietary specifications for optimal strength-to-weight ratio
• Saber tooth groove design — unique tooth profile engineered to extend sprocket service life
• Vortex patented sprocket geometry — exclusive design not found on any other sprocket
• Blue anodized finish — with contrasting silver machine-cut highlights for a distinctive appearance

Vortex CAT5 sprockets are a proven choice for both track and street riders seeking a performance upgrade over heavy OEM steel units. The blue anodized finish is applied to the sprocket body while the swept areas and tooth faces retain a bright silver contrast. Made in the USA to exacting race-level standards.