Folding bicycle

A folding bicycle 100 having a front fork assembly and a rear swing arm assembly 2 both coupled to a central frame assembly, and being such as to permit the front and rear wheels to be moved to a position generally alongside one another in the folded condition. The central frame assembly 1 includes a seat tube 15, and a bottom bracket assembly 3 coupled to the seat tube 15 by means of a rotary coupling which permits a limited amount of relative rotary movement about an axis coincident with the axis of the seat tube. The rear swing arm assembly 2 is pivotally coupled to the bottom bracket assembly 3, so that when the bicycle 100 is folded, the rear swing arm assembly is swung from an operative riding position to a folded condition, together with a concomitant rotation of the bottom bracket assembly 3 to permit the rear wheel to be positioned alongside the central frame assembly 1 and for permitting alignment of a chain transmission assembly. The front fork assembly may include forks comprising an upper fork part 4 and a left lower fork part 5 and a right lower fork part 5, each lower fork part 5 being connected to the upper fork 4 part by means of a respective pivotal coupling 42, which includes locking pawls 46 for retaining the fork parts 5 in an operative riding position, and the pawls 46 being releasable to permit the front wheel 18 to be pivoted towards the central frame assembly 1 to said folded configuration. In alternative embodiments, a pivotal coupling 60, 90 is provided on the central frame to enable the forks 61 to travel substantially within a first plane when they pivot from an operative riding configuration to a folded configuration.