Photo 1 of Cogster Alloy Bike Seatpost Reducer Shim, 100mm Length Aluminum Bicycle Reducing Sleeve Seat Post Tube Adapter for MTB,Mountain,City Bike,Road Bike, Adapting 30.9mm seatposts to 31.6mm seat Tubes

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Photo 1 of Cogster Alloy Bike Seatpost Reducer Shim, 100mm Length Aluminum Bicycle Reducing Sleeve Seat Post Tube Adapter for MTB,Mountain,City Bike,Road Bike, Adapting 30.9mm seatposts to 31.6mm seat TubesPhoto 2 of Cogster Alloy Bike Seatpost Reducer Shim, 100mm Length Aluminum Bicycle Reducing Sleeve Seat Post Tube Adapter for MTB,Mountain,City Bike,Road Bike, Adapting 30.9mm seatposts to 31.6mm seat Tubes