The invention is adapted for use with a bicycle, where a handlebar is connected to a front fork tube through a stem tube having a stem seat and a handlebar seat. A pair of lug clip portions and a pivotal portion are provided between the stem seat and the handlebar seat and pivotally connected to each other through a pivotal assembly. At least one abutting portion is formed beneath the pivotal portion, and a shock-absorbing member is mounted beneath the at least one abutting portion. The pivotal assembly is provided atop with a press block which is secured to and tightly abuts against the pivotal assembly using a first fastening member. The press block is provided at its upper surface with an accessory fixation structure adapted for coupling an accessory to the stem tube. The accessory fixation structure enables rapid installation of accessories onto the stem tube.

A vibration absorbing handlebar of a bicycle has a steering module, a left handle, and a right handle. The steering module has a stem. The left handle has a bar, and a first elastic component having two ends. One of the two ends of the first elastic component is connected with an end of the bar, and the other one of the two ends of the first elastic component is connected with the stem. The right handle has a bar, and a second elastic component having two ends. One of the two ends of the second elastic component is connected with an end of the bar, and the other one of the two ends of the second elastic component is connected with the stem.

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.

An operating device comprises a base and an operating member. The base includes a base body and a cover. The cover includes an upper outer surface, a first lateral outer surface, a second lateral outer surface, a first shoulder, and a second shoulder. The first shoulder is provided between the upper outer surface and the first lateral outer surface. The first shoulder includes a first curved surface connecting the upper outer surface and the first lateral outer surface. The second shoulder is provided between the upper outer surface and the second lateral outer surface. The second shoulder includes a second curved surface connecting the upper outer surface and the second lateral outer surface. The first curved surface is gentler than the second curved surface as viewed in a longitudinal direction.

An operating device comprises a base and an operating member. The base includes a base body and a cover. The cover includes an upper outer surface, a first lateral outer surface, a second lateral outer surface, a first shoulder, and a second shoulder. The first shoulder is provided between the upper outer surface and the first lateral outer surface. The first shoulder includes a first curved surface connecting the upper outer surface and the first lateral outer surface. The second shoulder is provided between the upper outer surface and the second lateral outer surface. The second shoulder includes a second curved surface connecting the upper outer surface and the second lateral outer surface. The first curved surface is gentler than the second curved surface as viewed in a longitudinal direction.

A position adjusting system for use in a vehicle includes a seat for supporting a rider, a rear wheel and a steerable front wheel, a steering arrangement including a handlebar for allowing the rider to control the steerable wheel, and a hub for interconnecting the components of the wheeled vehicle. The steerable wheel is steerable about at least two axes. The position adjusting system includes an adjustable seat support movably connected to the hub, an adjustable handlebar support movably connected to the hub, and a releasable position locking system configured to lock the position of the components of the vehicle relative to the hub. The hub includes a first portion and second portion, wherein the first and second portions are moveably connected to one another, such as by pivoting, sliding, orbiting, or a combination thereof. The hub permits adjustment of the angle between the steering axes.

A position adjusting system for use in a vehicle includes a seat for supporting a rider, a rear wheel and a steerable front wheel, a steering arrangement including a handlebar for allowing the rider to control the steerable wheel, and a hub for interconnecting the components of the wheeled vehicle. The steerable wheel is steerable about at least two axes. The position adjusting system includes an adjustable seat support movably connected to the hub, an adjustable handlebar support movably connected to the hub, and a releasable position locking system configured to lock the position of the components of the vehicle relative to the hub. The hub includes a first portion and second portion, wherein the first and second portions are moveably connected to one another, such as by pivoting, sliding, orbiting, or a combination thereof. The hub permits adjustment of the angle between the steering axes.

A three-piece stem of a bicycle includes a stem body, a bottom pipe, and a middle element. A first torus portion and a second torus portion are disposed at two ends of the stem body, respectively. The bottom pipe is disposed in the second torus portion of the stem body. The middle element is disposed between the second torus portion of the stem body and the bottom pipe. A connecting element couples the second torus portion of the stem body, the bottom pipe, and the middle element together, such that the second torus portion of the stem body, the bottom pipe, and the middle element are fixed tightly to a front forked upright pipe collectively, thereby enhancing the ease of assembly and the binding strength upon completion of assembly.

A scooter has a front support frame that is pivotally connected to a scooter deck. A pair of front wheels are each operably mounted the front support frame via wheel pivots. At least one spring is operably mounted between the front support frame and the scooter deck for biasing the scooter deck towards a horizontal configuration, but enabling the scooter deck to move to a leaning configuration when turning. A steering transmission arm transmits lateral movement via a pair of steering rods to the front wheels, so that when the scooter deck is leaned to one of the leaning configurations, the movement causes the steering transmission arm to turn the front wheels via the steering rods.

A stem buffer suspension assembly structure includes a main suspension stem inserted into a stem channel of a front buffer frame assembly and including a buffer assembly, wherein a stem and a headset are assembled on an end of the main suspension stem protruded out of the buffer assembly; an upper end cover assembled with the buffer assembly and abutted with a top of the stem; a lower pressing assembly is assembled with the main suspension stem and includes a lower plug member, a locking pin, a pressing member and a limit block. The lower plug member is assembled on the main suspension stem, and the lower plug member is locked with the locking part, the locking pin is screwed with the pressing member, the limit block is mounted with the locking pin and located between the lower plug member and the pressing member.