It might look normal from the outside but the engineering inside this incredible new chain design that makes possible a gear range previously found only in 2-chainring drivetrains. And it’s also the biggest contributor to the Eagle™ drivetrain’s ultra-smooth precise durable and quiet performance. The Eagle™ chain’s links have a smooth radius with no sharp edges or chamfers which yield a significant reduction in noise friction and wear on chainrings and cassette cogs. This design also allows for a flatter plate which means more consistent chain riveting and greater overall strength. HARD CHROME™ technology extends the chain’s optimal performance life and a Titanium Nitride coating on the Gold and Black models decreases corrosion and further reduces friction. Groundbreaking new chain design and technology The Eagle™ chain has been completely re-engineered and is produced with new manufacturing technology All-new Eagle™ PowerLock® chain connector with FLOWLINK™ technology gives better chain-guiding and increased longevity The XX1 Eagle™ chain is the quietest strongest and most wear-resistant chain in the world Unique features and design also give significantly improved wear resistance on Eagle™ cassettes and rings