Vortex 628ZK-55 CAT5 Aluminum Rear Sprocket 55-Tooth 415 Pitch

The Vortex 628ZK-55 is a 55-tooth CAT5 lightweight aluminum rear sprocket designed for 415-pitch chain applications. Built to Vortex's exacting race standards, this sprocket delivers the reduced rotating mass and precise power transfer that serious riders demand on the track or street.

Key Features:

• 55-tooth rear sprocket for significant gear ratio change and increased low-end acceleration
• CAT5 aluminum construction — specially formulated alloy per Vortex specifications for maximum strength-to-weight ratio
• 100% CNC manufactured in the USA to precise tolerances
• Vortex patented sprocket tooth design for extended sprocket longevity and smooth chain engagement
• 415-pitch chain compatible — ideal for lightweight chain conversion applications
• 628 bolt pattern carrier interface for direct bolt-on fitment
• Silver anodized finish resists corrosion and wear

The Vortex 628ZK-55 is engineered for riders seeking aggressive gearing changes for stunt riding, track days, or performance tuning. Vortex Racing sprockets are a trusted choice among racers and performance enthusiasts for their superior craftsmanship and consistent quality.