Renthal 221U-530-45P-HA Ultralight Rear Sprocket Pitch Hard Anodized Sprockets - 530 45-Tooth

The Renthal 221U-530-45P-HA Ultralight Rear Chainwheel is a 530-pitch, 45-tooth rear sprocket engineered for maximum performance in road, street, and track-day applications. Precision CNC machined in Manchester, UK from high-strength 7075 T6 aluminum alloy, this sprocket delivers an exceptional combination of light weight and durability that has made Renthal the choice of factory race teams worldwide.

Weighing in at 66% lighter than a comparable steel sprocket, the Ultralight design minimizes revolving unsprung mass at the rear wheel for improved power transfer and more responsive throttle feel. Every chainwheel is individually CNC machined to the tightest possible tolerances, ensuring precise fitment, concentricity, and optimal load dispersion across every tooth.

Key Features:

• 530 Pitch, 45-Tooth configuration — a direct-fit 520 conversion sprocket upgrade
• 7075 T6 aluminum alloy construction — 66% lighter than steel with exceptional strength
• Hard anodized surface finish — an integral surface coating that significantly increases hardness and wear resistance for extended service life
• Computer-engineered tooth profile — optimized for maximum power transfer, reduced noise, and longer chain and sprocket life
• Self-cleaning mud grooves between every tooth on both sides to prevent debris buildup
• CNC machined to tight tolerances in the UK for accurate, reliable fitment

The hard anodized finish (indicated by the -HA suffix) makes this sprocket equally suited for demanding road racing and high-performance street use. Renthal Ultralight chainwheels are trusted by more factory race teams than any competing brand, with championship-winning pedigree across World Superbike and National Superbike paddocks globally.