Shimano Alivio 9-Speed 2-PCS Mountain Bicycle Crank Set - FC-M4050 (Silver - 175MM, 40X30X22T W/CG)
Price 109.99 USD
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.