Amazon.com : BOLANY Bike Seat Posts Bike Suspension Seatpost 27.2 31.6 Alumium Adjustable Seatpost for MTB Road Bike Mountain Bike Fixed Bike Seatpost (Black, 27.2mm) : Sports & Outdoors
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ZOOM Suspension Seatpost Shock Absorber Damping Alu MTB Mountain Bike Bicycle Seat Post 25.4 27.2 28.6 30.1 30.4 30.9 31.6 33.9
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ZOOM Shock Absorb Seat Post Suspension 27.2mm 28.6 Damping MTB Road Bi – Kasen Bikes
Zoom Suspension Travel Seatpost 27.2 28.6 30.8 31.6 33.9X 350 MTB bike Seat post | eBay