Renthal 409U-525-42P-HA Ultralight Rear Sprocket 525 Chain 42 Tooth Hard Anodized Aluminum

The Renthal 409U-525-42P-HA Ultralight Rear Sprocket is a precision-engineered rear chainwheel designed for serious street, track, and competition use. Featuring a 525 chain pitch and 42-tooth count, this sprocket is CNC machined from high-strength 7075-T6 aluminum alloy to extremely tight tolerances, delivering a reliable, accurate fit with every installation.

Key Features:

• 66% lighter than steel — Ultralight aluminum construction minimizes unsprung rotating mass for improved handling and throttle response
• 7075-T6 aluminum alloy — High-strength, specially enhanced aerospace-grade material provides exceptional durability despite reduced weight
• Hard anodized finish — Integral surface coating that significantly increases surface hardness and wear resistance for extended chainwheel life
• Advanced tooth profile — Computer-engineered tooth geometry ensures precise concentricity, accurate load dispersion, and maximum power transfer
• Self-cleaning mud grooves — Grooves between teeth on both sides prevent dirt and debris buildup, maintaining smooth chain engagement
• 525 chain pitch, 42 teeth — Designed for 525-pitch drive chains; sold individually
• CNC machined in Manchester, UK — Manufactured to the tolerances demanded by factory race teams worldwide

Renthal Ultralight rear sprockets are trusted by more factory motocross, supercross, and road racing teams than any other brand. Whether you're hitting the track or the street, the 409U-525-42P-HA delivers the weight savings and precision that serious riders demand.