Seat Post,3K/UD Full Carbon Light Weight Seatpost 25.4/27.2/30.8/31.6 X 350/400mm Lay Back Bicycle Seat Post, for Bicycle MTB BMX Road Bike Saddle Post Bike Seat Post Tube Part,3K,24.5 * 400mm : Amazon.ca:
Lever Seatpost Clamp Chrome for Folder Bicycle 24.5mm | eBay
Zipp Service Course SL 400mm Seatpost | 24.5mm | 20mm Offset | In Matte Black