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PLATT Bicycle Seatpost Shim Aluminum Alloy Bike Seat Post Tube Adapter(22.2 to 25.4) : Amazon.co.uk: Sports & Outdoors
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compatibility - Are seatpost shims safe to use - for the frame, seatpost, and the rider? - Bicycles Stack Exchange
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Amazon.com : OMNI Racer Worlds Lightest Seatpost Adapter Shim: Coverts 30.9mm to 27.2mm Black : Sports & Outdoors
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compatibility - Are seatpost shims safe to use - for the frame, seatpost, and the rider? - Bicycles Stack Exchange
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