ITEM NAME:Black Ahead Handlebar Stem Shim/Reducer 1 1/8inch to 1inch 28.6mm to 25.4mm Description: - Brand new alloy ahead handlebar stem shim / reducer 25.4mm to 28.6mm. - This adapter will allow you to fit a 28.6mm ahead style handlebar stem to a bike which has a 25.4mm threadless fork steerer. - Made from machined aluminium. - Material: aluminum alloy - Small one inner diameter: 25.4mm/1inch; Outer diameter: 28.6mm/1-1/8inch - Big one inner diameter: 25.4mm/1inch; Outer diameter: 28.6mm/1-1/8inch; Height: approx. 27.3mm/1inch Package Included: Set of 2 Pieces Ahead Handlebar Stem Shim.Set of 2 Pieces Ahead Handlebar Stem Shim. - This adapter will allow you to fit a 28.6mm ahead style handlebar stem to a bike which has a 25.4mm threadless fork steerer. People always bought together with.