In an aspect, a compactable bicycle is provided, comprising a base frame portion and a steering structure, at least one of which has a first and a second frame element. Each frame element has a locking surface, an end, and an aperture. The frame elements are positionable in a first position wherein the first and second apertures are aligned and the locking surfaces face away from one another, and in a second position in which the apertures are unaligned. A plunger has first and second plunger locking surfaces and is movable to a clamping position where it extends in both the first and second apertures and engages the first frame element locking surfaces, and a release position wherein the plunger retracts from the second aperture sufficiently to permit the first and second ends to be separated from one another.