An adaptor bar includes a retractable tube unit. Two end parts are respectively connected to two respective ends of the tube unit. Two C-shaped hooks are respectively fixed to the two ends of the tube unit. Each hook includes a first connection portion. Two plates are respectively connected to the two end parts. Each plate includes a first section, a second section and a third section. The second section is formed inclinedly between the first and third sections. The third section of each plate is fixed to the end part corresponding thereto. The first section of each plate is removably engaged with the first connection portion of the hook by sliding the end part. The first section includes a first recess and a second recess. The second recess is located close to the second section and includes a recessed reinforcement which reinforces a portion between the first and second sections.

A bicycle retractable bicycle cross bar adaptor includes a bar having a first tube, a second tube and a control unit. The first tube has a first connection end and the second tube has a second connection end. The control unit includes a first part and a second part. The first part includes a head on the first end thereof, outer threads formed to the outer surface of the first part, and multiple plates extending from the second end of the first parts. The second connection end is slidably inserted into the first connection end in the first part. The second part is rotatably and movably mounted to the first part to press the plates to clamp the second tube to secure the second tube, or to release the plates so that the second tube is movable relative to the first tube.

A hidden-type shock absorbing bicycle frame has a front vehicle frame, a transmission assembly, a rear vehicle frame, and a damper. The front vehicle frame has a seat tube having two assembly plates. The assembly plate has an upper pivot hole and a lower pivot hole. An assembly space is formed between the assembly plates. The transmission assembly is pivotally connected to the upper pivot holes and has two front arms located in the assembly space and two rear arms located at two sides of the seat tube and extending backwardly. The rear vehicle frame is pivotally connected with the rear arms and is pivotally connected with the seat tube. The damper hidden inside the assembly space has a top end pivotally connected with the front arms and a bottom end pivotally connected to the lower pivot holes.

There is provided a balance bike including: a front wheel and a rear wheel; a head portion steerably holding the front wheel; a main frame including a front frame extending rearward from the head portion while being inclined downward and a rear frame extending rearward from a rear end of the front frame at an angle closer to a horizontal direction than a direction in which the front frame extends, the main frame connecting the head portion and the rear wheel; and a seat support portion fixed to a bent portion where the front frame and the rear frame are connected to each other, and supporting a seat slidably in an up-down direction.

An injection moulded cantilevered single side mountable wheel for a bicycle, a rim; a central hub; and a plurality of hollow spokes connecting the rim to the central hub.

An injection moulded cantilevered single side mountable wheel for a bicycle, a rim; a central hub; and a plurality of hollow spokes connecting the rim to the central hub.

A foldable top tube assembly for a bicycle is provided. The assembly includes a seat post attachment terminus coupled to a first telescoping tubular member, and a headset assembly attachment terminus coupled to a second telescoping tubular member. The overall length of the folded top tube assembly may be about ⅓ the overall length of the fully extended top tube assembly. The assembly further includes a central, hinged tubular member having a first end sized to receive the first telescoping tubular member, and a second end sized to receive the second telescoping tubular member. The assembly may also include a first spring tending to resist extension of the first telescoping tubular member from the first end of the central, hinged tubular member, and a second spring tending to resist extension of the second telescoping tubular member from the second end of the central, hinged tubular member.

A bicycle is equipped with a dual chain drive system having two cranksets symmetrically mounted on the rear section of an adapted and compact frame. The cranksets are located in close proximity to the rear wheel hub axle to enhance the energy efficiency, responsiveness and manoeuvrability of the bicycle.

A bicycle frame assembly including a seat tube having first and second end portions (wherein the seat tube second end portion includes a bend and terminates in a first open end facing a first direction), a down tube having first and second end portions (wherein the down tube first end portion is mounted to the seat tube first end portion, and the down tube second end portion includes a bend and terminates in a second open end facing a second direction opposite to the first direction), and a top tube having first and second end portions (wherein the top tube first end portion is mounted to the seat tube second end portion and terminates in a third open end facing the first direction, and the top tube second end portion is mounted to the down tube second end portion and terminates in a fourth open end facing the second direction).

A modular electric bicycle with the classic diamond frame design which has been designed to accommodate a d-c rechargeable battery pack within its top, down and seat tube and conceal all electrical wiring inside the frame. The modular electric bicycle has been designed in order to ease the maintenance of electronic components and replace obsolete electronics just as easily as conventional bicycles can have mechanical components replaced.