Precision-engineered Dura-Ace design ensures the ultimate in crisp, accurate & reliable front indexed shifting Compatible with 10-speed drivetrains Lightweight nickel-plated alloy chain cage reduces weight whilst resisting abrasion from the chain Extra wide pivot link is more rigid than narrower designs, suppressing flex for enhanced shifting Forged aluminium construction reduces weight without sacrificing durability Hard-wearing Dura-Ace finish Maximum capacity of 15 teeth Weight: 79 grams (28.6 mm band)