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• Aluminum Alloy 100mm Bicycle Seatpost Shim Convert Bike Seat Post Tube Conversion Adapter 22/25/27/28/30/30/30/31/31/33/34/36mm Brand: GANOPPER Name: seat tube reducer CNC machining surface anodizing Material: aluminum alloy Color: Anodized black Length:100mm the best way to choose: First measure the internal diameter of the tube within the body And the outer diameter of the seat tube You can know the specs of the reducer sleeve specification: 22 to twenty-five 25 to 27 25 to 28 25 to 30 25 to 31 27 to 28 27 to 30 27 to 30 27 to 30/30 27 to 31 27 to 33 28 to 31 30 to 31 31 to 33 31 to 36 31 to 34 33 to 34 The weight is shown below

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