In one embodiment, a frame has an expanded configuration and a collapsed configuration. The tire monitoring assembly may include a mounting stud having a head and a shank extending from the head, with the head including a flange portion and an anti-rotation portion adapted to operatively engage the anti-rotation feature of the wheel rim, and with the shank including a threaded end spaced from the head. A gate region may be provided one end or both ends of the porous structure.