Are you looking to upgrade to 10-speed but want to keep the wide gear range of a triple? Shimano's Deore XT Dyna-Sys 10-Speed Upgrade Kit refines Shimano's excellent Deore XT group with another gear and an optimized drivetrain. For powerful accelerations, the kit comes with Shimano's stiff, light Hollowtech II crankset and precision external bottom-bracket. Continuing from there, you'll appreciate the other trail-mastering components, such as the RapidFire shifters, the smooth-shifting cassette as well as the flawless front and Shadow rear derailleurs. And it's all tied together with a chain that glides over the gears with Shimano's legendary smoothness.