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Seatpost Shim, Seat Post Adapter Reducing Sleeve Shim for Mountain Bike Seat Post Tube Shim //28.6/30.4/30.8/31.6/33.9/34.9 - , 30.8 30.8 to 27.2mm - Walmart.com
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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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