A tricycle may be operable between a first mode of operation steerable by a tricycle rider, and a second mode of operation steerable by an individual pushing the tricycle. A rider handle, in the first mode, may be configured to be rotationally coupled with the stem in a manner permitting a tricycle rider to exert forces on the rider handle and thereby turn the fork, and the rider handle in the second mode, being configured to be rotationally uncoupled from the stem, preventing forces on the rider handle from turning the fork. At least one rotation restricted may be included for preventing the front wheel from turning to a position where the front wheel axis leads the fork axis, and for maintaining the front wheel axis in a position trailing the fork axis both when the tricycle is propelled by a tricycle rider in the first mode and when the tricycle is pushed from behind in the second mode.

A hybrid pump-action vehicle and therapy device may include a pumping arm attached to a lower pump-action assembly. As the pumping arm is actuated, the lower pump-action assembly moves forward and rearward in response to the pumping action and powers movement of the vehicle. The lower pump-action assembly may be releasably connected to the pump arm so that the pump arm can be disengaged from the pumping action but still be usable for steering. A motor may also be provided to provide assistance or full power to the vehicle based on a user-selectable amount of assistance. And finally, the vehicle may be configured such that it can be collapsed to a fraction of its operating footprint to enable easy transport and storage.

A hybrid pump-action vehicle and therapy device may include a pumping arm attached to a lower pump-action assembly. As the pumping arm is actuated, the lower pump-action assembly moves forward and rearward in response to the pumping action and powers movement of the vehicle. The lower pump-action assembly may be releasably connected to the pump arm so that the pump arm can be disengaged from the pumping action but still be usable for steering. A motor may also be provided to provide assistance or full power to the vehicle based on a user-selectable amount of assistance. And finally, the vehicle may be configured such that it can be collapsed to a fraction of its operating footprint to enable easy transport and storage.

A tricycle may be operable between a first mode of operation steerable by a tricycle rider, and a second mode of operation steerable by an individual pushing the tricycle. In both such first and second modes, the frame of the tricycle is configured to rotatably support the rear wheels and configured to support the head tube at a distance from the rear wheels such that a distance between the head tube and rear wheels need not necessarily be changed even when the front wheel axis location is changed from one mode to another.

A tricycle may be operable between a first mode of operation steerable by a tricycle rider, and a second mode of operation steerable by an individual pushing the tricycle. In both such first and second modes, the frame of the tricycle is configured to rotatably support the rear wheels and configured to support the head tube at a distance from the rear wheels such that a distance between the head tube and rear wheels need not necessarily be changed even when the front wheel axis location is changed from one mode to another.

Tool-free bicycle components include a pedal assembly with pedals shipped in folded positions and rotated by hand into locked open positions for riding. A locking member nests in an axle notch to rotationally lock the pedals in place. A stem-fork assembly includes a fork unit having a fork post with a slidable compression ring covering a spring-biased stem locking member. The fork post is inserted into a stem tube of a stem unit, pushing the ring down and exposing the stem locking member, which can then snap into the stem tube to lock the fork unit with the stem unit. A training wheel assembly includes a mounting unit having a spring member with a bendable engagement end. When a wheel support with engagement slot is inserted into the mounting unit, the spring member snaps into the engagement slot to lock the training wheel support in place.

A foldable fork of a bicycle, comprising a stem having a first end and a second end; a pair of prongs configured to receive an axle of a bicycle wheel; and a pivot having an axis that is angled with respect to the axle of a bicycle wheel when connected to the prongs, the pivot connected to the second end of the stem on a top section of the pivot and connected to the pair of prongs on a bottom section of the pivot. The top section of the pivot is configured to receive the bottom section of the pivot. When the bottom section of the pivot is rotated away from the top section, a wheel connected to the prongs is offset by a distance to a side of a frame connected to the bicycle.

A foldable fork of a bicycle, comprising a stem having a first end and a second end; a pair of prongs configured to receive an axle of a bicycle wheel; and a pivot having an axis that is angled with respect to the axle of a bicycle wheel when connected to the prongs, the pivot connected to the second end of the stem on a top section of the pivot and connected to the pair of prongs on a bottom section of the pivot. The top section of the pivot is configured to receive the bottom section of the pivot. When the bottom section of the pivot is rotated away from the top section, a wheel connected to the prongs is offset by a distance to a side of a frame connected to the bicycle.

A bicycle apparatus with interchangeable front fork is disclosed. The bicycle comprises a frame and a quick release assembly for securing the removable front fork attachment assembly to the bicycle frame's head tube. The interchangeable front fork attachment assembly and quick release assembly allows for the quick interchanging of front fork with varying attachments which utilize different methods to achieve motion.

A bicycle apparatus with interchangeable front fork is disclosed. The bicycle comprises a frame and a quick release assembly for securing the removable front fork attachment assembly to the bicycle frame's head tube. The interchangeable front fork attachment assembly and quick release assembly allows for the quick interchanging of front fork with varying attachments which utilize different methods to achieve motion.