Embodiments of the invention are directed to trampolines and component parts including a frame assembly to fold a fixed or foldable trampoline from an expanded state to a collapsed state or vice-versa. In one embodiment, a frame assembly includes a base frame member, two peripheral frame members and two connecting members connecting the two peripheral frame members to the base frame member. The two peripheral frame members are also connected to a center joint which may slide up and down a center frame post via a folding mechanism which may include a crank shaft and an elongated threaded member. In some embodiments, the frame assembly may include hydraulics and the two peripheral frame members may be off-set relative to one another. Embodiments of component parts for the trampoline may also include a plurality of net frame members, a foldable ladder, a wheeled support and a frame pad.