Ritchey Stem Shim Steerer Tube Adapter Description: This Ritchey Stem Shim Steerer Tube Adapter proves useful when converting stems intended for use with 1-1/8" steerer tubes down for use with forks built with 1" steerers. Features: Stem adapter for stems with 1-1/8" steerer fitment Reduces inner stem diameter down to work with 1" fork steerer tubes Sleek, black anodized 6061 alloy Specifications: Material: 6061 alloy Color: Black Weight: 15g Inner Diameter: 25.4mm (1") Outer Diameter: 28.6mm (1-1/8")