A fork assembly for use in removably mounting a pair of bicycle fork tubes having longitudinally extending upper and lower brackets on a fork mounting tube of a bicycle frame comprising an inner tube rotatably mounted within the fork mounting tube and a rod extending through the inner tube. The brackets have rearwardly extending slots through which the rod passes to engage the fork assembly. A lower spool on the rod is adapted to engage the under side of the lower bracket and an upper spool on the rod is adapted to engage the under side of the upper bracket. The spools are movable longitudinally with the rod within the inner tube. Spring means within the inner tube yieldingly urges the spools into engagememt with the brackets. Locking means is provided on the upper end of the rod and is movable longitudinally of the rod such that when the locking means is moved longitudinally relative to the rod toward the upper surface of the upper bracket, the fork assembly is locked on the brackets, and when the locking means is moved longitudinally relative to the rod away from the upper bracket, the fork assembly can be removed by moving the rod and the spools longitudinally downwardly against the action of the spring means disengaging the spools from the brackets so that the fork assembly can be removed by transverse movement through the slots.

In a handlebar comprising an elongate handle arm and a boss which supports the central part of the arm, the boss has an aperture with a generally channel-shaped region for receiving the central part of the arm, and a pressure body is mounted in the aperture for selective movement into a thrust position against the central part of the arm to press the central part into the generally channel-shaped region of the aperture so as to clamp the arm relative to the boss.

An apparatus for rotatably fitting a fork stem (4) in a head tube (5) of a bicycle. This apparatus has a first race element (1) fitted on the fork stem, and a second race element (2) opposed to the first race element and inserted into an annular space defined between the fork stem and the head tube. The first race element (1) defines a first contact surface (1b). A first ring element (7) defining a first rolling body supporting surface (7b) is fitted on the first race element (1). The second race element (2) defines a second contact surface (2b). A second ring element (8) defining a second rolling body supporting surface (8b) is fitted on the second race element (2). The first contact surface (1b) is shaped to have a component of reaction force acting radially inwardly of the fork stem from the first ring element to the first race element when rolling bodies (6) are clamped between the first supporting surface and second supporting surface. The second contact surface (2b) is shaped to have a component of reaction force acting radially outwardly of the head tube from the second ring element to the second race element when the rolling bodies (6) are clamped between the second supporting surface and second supporting surface.

A tricycle includes a mainframe with front and rear sections. The front section may include a steering assembly with a rotatable wheel. The rear section may provide support for two spaced wheels and may be configured to provide a substantially unencumbered open area between the spaced wheels. The tricycle features a guide handle removeably connected to the tricycle and a locking mechanism configured to lock the steering assembly in a predetermined stationary position.

A tricycle includes a mainframe with front and rear sections. The front section may include a steering assembly with a rotatable wheel. The rear section may provide support for two spaced wheels and may be configured to provide a substantially unencumbered open area between the spaced wheels. The tricycle features a guide handle removeably connected to the tricycle and a locking mechanism configured to lock the steering assembly in a predetermined stationary position.