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The Renthal UltraLight Rear Chainwheel, part number 441U-428-50GPBU, is engineered for high-performance powersports applications, specifically designed for KTM 85 SX and 105 SX models. Crafted from CNC-machined 7075 T6 aluminum, this sprocket offers a significant weight reduction—approximately 66% lighter than traditional steel options—without compromising strength or durability. Its precise manufacturing and tight tolerances ensure a perfect fit, optimal concentricity, and efficient load dispersion for maximum power transfer during demanding riding conditions. The tooth profile is optimized through computer engineering to enhance grip and improve overall chain engagement, contributing to improved acceleration and efficiency on the track or trail. Its high-strength material combined with advanced surface treatments ensures long-lasting wear resistance, making it a reliable choice for racing enthusiasts and dedicated riders alike. This sprocket's lightweight design helps reduce rotational mass, resulting in quicker throttle response and improved handling. The Renthal UltraLight Rear Chainwheel is a proven component used by factory race teams, reflecting its performance-oriented engineering and quality. Designed for direct fitment on KTM 85 SX (2007-2011) and KTM 105 SX (2009-2010), this sprocket is an essential upgrade for riders seeking to enhance their bike’s performance with a durable, lightweight component that delivers consistent power transfer and reliability in competitive riding environments. Whether you're replacing worn components or upgrading for race day, this sprocket provides the premium quality and precision engineering expected from Renthal.
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