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Amazon.com : BUCKLOS Carbon Bike Seatpost 27.2 30.8 31.6 x 350mm 400mm, Mountain Bike Road Bicycle Seat Post 3K Carbon Fiber Adjustable Ultra-Light, Suitable for MTB BMX Gravel, Hybrid, and E-Bikes Urban :
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Amazon.com: TPard Carbon Bike Seatpost 27.2/31.6 Ultralight Carbon Fiber Bicycle Seat Post Bike Seat Tube for Mountain Road Bikes MTB BMX : Everything Else
SYNCROS full carbon fiber seatpost half matte half gloss mountain bike/road bike carbon seatpost light seatpost 27.2/30.8/31.6mm - AliExpress
FSA K-Force Light Rigid Carbon Seatpost with Plastic Sleeve, 27.2 x 400mm, 25mm, Black - Modern Bike
FSA K-Force Carbon Seatpost 27.2 Di2 Compatible 25mm Offset - SoCal Bike - Oceanside, Carlsbad and north San Diego county's favorite bike shop, Bicycle and ebike rentals, sales, and service