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.

An adjustable handlebar stem assembly includes a vertical tube with a head which has a toothed face. A stem includes two plates which are pivotably connected to the head and includes a clamping portion to clamp a handlebar thereto. A pawl member is pivotably located between the two plates and includes press end and an engaging portion on two ends thereof. The engaging portion has teeth removably engaged with the toothed face. A restriction rod extends through one of the two plates and is connected to a restriction member. A quick-release is pivotably engaged with a curved and recessed face of the pawl member. The quick-release includes a recess with which the restriction member is engaged. The quick-release cannot be pivoted when the restriction member is not moved and disengaged from the recess of the quick-release, so that the stem is not pivoted relative to the vertical tube.

An adjustable handlebar stem assembly includes a vertical tube with a head which has a toothed face. A stem includes two plates which are pivotably connected to the head and includes a clamping portion to clamp a handlebar thereto. A pawl member is pivotably located between the two plates and includes press end and an engaging portion on two ends thereof. The engaging portion has teeth removably engaged with the toothed face. A restriction rod extends through one of the two plates and is connected to a restriction member. A quick-release is pivotably engaged with a curved and recessed face of the pawl member. The quick-release includes a recess with which the restriction member is engaged. The quick-release cannot be pivoted when the restriction member is not moved and disengaged from the recess of the quick-release, so that the stem is not pivoted relative to the vertical tube.

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.

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.

Presented herein is a foldable bicycle (folding bike) with improvement including a step-through or low step-over electric bicycle (eBike, pedelec) with a main frame member or members extending rearward from the head tube to a hinge and a bottom bracket where a mid-drive motor may be positioned, and wherein at least one battery is mounted to the frame, and wherein the hinge is located near the midpoint of the bicycle and allows the front frame assembly and the rear frame assembly to pivot laterally around the hinge in a manner moving generally parallel to the ground to a folded position. Other improvements presented herein include a foldable bicycle, electric, or non-electric, with a handlebar and stem which are moveable to a steering assembly storage position, and in the storage position the handlebar and/or stem serve to fasten the foldable bicycle in the folded position. The folded bicycle may be rolled along the ground in the folded position.

A convertible bicycle has separable front and rear wheel units. The convertible bicycle can operate in individual or in tandem mode as a tricycle unit. The rear wheel unit has a vertical interlocking gear which can interface with a frontal interlocking gear of the frontal wheel unit. The front wheel unit of an auxiliary bicycle can be detached and the remaining rear wheel unit attached to the rear wheel unit of another bicycle in order to form a tandem tricycle.

A convertible bicycle has separable front and rear wheel units. The convertible bicycle can operate in individual or in tandem mode as a tricycle unit. The rear wheel unit has a vertical interlocking gear which can interface with a frontal interlocking gear of the frontal wheel unit. The front wheel unit of an auxiliary bicycle can be detached and the remaining rear wheel unit attached to the rear wheel unit of another bicycle in order to form a tandem tricycle.