Shimano Alivio FC-M4050 MTB Bike 3x9 Speed Crankset 40-30-22T HollowTech II BB52
Speed: 3x9 Speed. Fits Hollowtech II spindle. 1, Crankset with chain guard. 3, Crankset no chain guard. Shell thread: BC1.37" x 24T. Bottom bracket type: Hollowthch II. Type: Hollowthch II. With better sealing and rotation.