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Handlebar reducers (adapters in the form of spacers). Reducer 1 (on the left in the picture): Diameter: 22.2 mm > 25.4 mm. Length: 87 mm. Reducer 2 (right in the picture): Diameter: 25.4 mm > 28.6 mm. Length: 40 mm. The 22.2 mm > 25.4 mm spacer allows you to adjust the diameter of the stem tube to the diameter of the head tube that receives the stem. The 25.4mm > 28.6mm spacer allows you to fit the diameter of the Ahead stem on the stem tube head.