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Seatpost 25.4 27.2 Adapter | Seatpost 27.2 31.6 Adapter | Seatpost Shim 30.9 31.6 - 25.4 - Aliexpress
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Amazon.com : aucun Universal Bike SEATPOST Reducer 27.2 > 31.8MM Shim Extension Convert Tube Adapter Adaptor Cycle Vintage MTB Fixie SINGLESPEED Spacer Aluminium SEAT Post Saddle : Sports & Outdoors
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Amazon.com : cyclingcolors Bike Shim Reducer : 22.2MM > 25.4MM 25.4MM > 28.6MM 24MM > 25MM 1" 1 1/8" SEATPOST STEM Ahead Tube Adapter Bicycle (22.2mm > 25.4 mm (1")) : Sports & Outdoors
![Seatpost Adapter Shim Spacer Diameter Size Change Pin Seat 25.4 27.2 30.0 30.4 30.8 28.6 30.9 31.6 Mm Mtb Bike Tube Convert - Bicycle Seat Post - AliExpress Seatpost Adapter Shim Spacer Diameter Size Change Pin Seat 25.4 27.2 30.0 30.4 30.8 28.6 30.9 31.6 Mm Mtb Bike Tube Convert - Bicycle Seat Post - AliExpress](https://ae01.alicdn.com/kf/H131b849ac4ba48de8972e9b75076aa00a/Seatpost-Adapter-shim-spacer-diameter-size-change-pin-seat-25-4-27-2-30-0-30.jpg_Q90.jpg_.webp)
Seatpost Adapter Shim Spacer Diameter Size Change Pin Seat 25.4 27.2 30.0 30.4 30.8 28.6 30.9 31.6 Mm Mtb Bike Tube Convert - Bicycle Seat Post - AliExpress
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Amazon.com : Cane Creek .ST25272 Seatpost Shim, 25.4 - 27.2mm : Bike Seat Posts And Parts : Sports & Outdoors
![compatibility - Are seatpost shims safe to use - for the frame, seatpost, and the rider? - Bicycles Stack Exchange compatibility - Are seatpost shims safe to use - for the frame, seatpost, and the rider? - Bicycles Stack Exchange](https://i.stack.imgur.com/R80gY.jpg)