Dahon PostPump Seatpost 33.9mm BlackThe Dahon PostPump Seatpost is compatible with folding bikes that have 33.9mm seatposts. This integrated design is hidden from thieves with its natural stealth. It’s always ready to go when you need it and the PostPump Head adapts to Presta and Schrader Valves automatically. This pump reaches 100 PSI in less time than other frame pumps.025952511015