Profile Design Boa 135mm 110d 1-1/8" Threadless Black Clamp Diameter: 25.4mmClamp Diameter: 25.4mmSteer Tube Clamp Diameter: 1-1/8"Steerer Tube: 1-1/8" ThreadlessStem Color: BlackStem Length: 135mmStem Rise: 20 degWeight: 277g