"Ultra-Drive™ chainrings - requires BB with L. 111 mm (asymmetrical) for triple crankset. The aluminum crankset of the Chorus groupset is changing faces. The 2004 version introduced the four-arm version that has been made famous by the Record groupset. Lightness and stiffness are its distinguishing features. The Chorus™ 3x10 drivetrain is a triple drivetrain that uses the materials and technical features of a product intended for competitions. It is the ideal choice for riders who want to tackle the steepest climbs or enjoy cycle touring in the best conditions taking advantage of the excellent materials and advanced technology that distinguish the Chorus™ groupset."

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