HYPERDRIVE--Shimano’s front shifting system is based on the HyperDrive concept. The front derailleur, HG chain and SG-X chainrings all work together to make the front shifting action more reliable, more precise and faster.
2 Piece Hollowtech Crankset
Compatible with 9-speed HG chains
Gear Ratio: 40/30/22t
Chainline: 50 mm
Includes: chain guard
Bottom Bracket Compatibility: SM-BB51 or Pressfit SM-BB94