I think Piemel nailed it, Stolen, Shadow Conspiracy, Animal, Abike Co and others make them for BMXs. They call them 'wedge' seatposts, whether they use the quill or bung/expander. Had to find out as the Magnets option was going to give me nightmares ;)
I think Piemel nailed it, Stolen, Shadow Conspiracy, Animal, Abike Co and others make them for BMXs. They call them 'wedge' seatposts, whether they use the quill or bung/expander. Had to find out as the Magnets option was going to give me nightmares ;)