Vortex 251AV4-43 V4 Aluminum Rear Sprocket 43T 520-Pitch Silver

The Vortex 251AV4-43 is a 43-tooth, 520-pitch aluminum rear sprocket built on Vortex's next-generation V4 design — an evolution of the legendary CAT5 platform. The V4 delivers a 10–15% reduction in weight over the CAT5 without sacrificing structural integrity, thanks to a redesigned cutout pattern with fully machined faces on both sides for a clean, two-tone appearance.

Key Features:

• V4 design: 10–15% lighter than the CAT5 predecessor with no compromise in strength
• 43 teeth, 520-pitch chain compatibility — ideal for stock replacement or 520 conversion builds
• Lightweight aluminum construction — approximately half the weight of a comparable steel sprocket
• 100% CNC manufactured in the USA to Vortex's proprietary alloy specifications
• Silver anodized finish applied prior to cutting for corrosion resistance and the iconic two-tone machined look
• Vortex patented tooth geometry for extended sprocket longevity

Aluminum sprockets like the 251AV4-43 are the preferred choice for road racing, motocross, flat track, and drag racing applications where rotational weight savings translate directly into throttle response and rear-wheel performance. For maximum service life, chain cleaning and tension should be checked every 300–400 miles.