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Amazon.com : Birdy Bicycle Seat Post of Titanium 34.9mm Balance Seat Pillar for Folding Bike Lightweight 550mm Length and Extended 580mm Suitable for Regular Saddles 7*7 and 7*9mm (550, Matte Black Color) :
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Amazon.com: Yesbon Bicycle Seat Post, Aluminum Alloy Bike Seat Extension Post, Apply to Mountain Bike,Trekking,Racing Bikes Seat Post,BlackRed-27.2mm~28.6mm : Everything Else
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Amazon.com : UPANBIKE Bike Seat Post Aluminum Alloy Extra Long 17.7inch(450mm) Replacement Bicycle Seatpost φ 25.4 27.2 28.6 30.4 30.9 31.6mm(25.4mm) : Sports & Outdoors
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FMFXTR Aluminum Alloy Mountain Bike Extended Seat Post, Specification: 33.9x550mm (Black)