A snow vehicle is disclosed comprising a vehicle frame, a propulsion unit coupled to the frame, and a front ski steered by a steering mechanism. The snow vehicle has a chain coupling the sprocket of the propulsion unit and a chain tensioning device to take up the chain tension. The chain has a chain guide positioned below a lower run of the chain which directs the chain towards an upper run of the chain.

Herein is disclosed a straddle-ridden vehicle frame stiffener comprising a support structure for stiffening the straddle-ridden vehicle frame, the support structure comprising a first side; and a second side, adjacent to the first side; a first mounting element for removably mounting the support structure to the straddle-ridden vehicle frame, the first mounting element being attached to the first side; a second mounting element for removably mounting the support structure to the straddle-ridden vehicle frame, the second mounting element being attached to the second side; and wherein the first side and the second side are rigidly connected to one another.

A linkage mechanism including a base, a first linkage, a second linkage and a driving element is provided. The first linkage has a first end portion and a second end portion opposite to each other, and the first end portion is pivoted to the base. The second linkage has third end portion and a fourth end portion opposite to each other, wherein the third end portion is coupled to the base, and the second end portion and the fourth end portion are coupled with each other. The driving element is coupled to at least one of the second end portion and the fourth end portion, and is configured to drive the first linkage and the second linkage to move relative to the base. A walking aid device is also provided.

A linkage mechanism including a base, a first linkage, a second linkage and a driving element is provided. The first linkage has a first end portion and a second end portion opposite to each other, and the first end portion is pivoted to the base. The second linkage has third end portion and a fourth end portion opposite to each other, wherein the third end portion is coupled to the base, and the second end portion and the fourth end portion are coupled with each other. The driving element is coupled to at least one of the second end portion and the fourth end portion, and is configured to drive the first linkage and the second linkage to move relative to the base. A walking aid device is also provided.

A bicycle includes a frame having a first segment and a second segment each elongated along a longitudinal axis. A hinge includes a first face on the first segment and a second face on the second segment. The first face and the second face are rotatable relative to each other about a rotational axis. The rotational axis extends at a non-right angle relative to the longitudinal axis.

A bicycle includes a frame having a first segment and a second segment each elongated along a longitudinal axis. A hinge includes a first face on the first segment and a second face on the second segment. The first face and the second face are rotatable relative to each other about a rotational axis. The rotational axis extends at a non-right angle relative to the longitudinal axis.

The hoverboard buddy system utilizes a number of components that can be attached together with a hoverboard in a number of different configurations in order to expand the riding options of the user. In one embodiment, components include: a hoverboard, a saddle possibly with additional wheels and a stability bar, a plurality of straight handles, a plurality of curved handles, a plurality of accessory wheels, a split seat that independently actuates either foot pedal on a hoverboard, a fixed bench seat, pusher extension, and other components.

The hoverboard buddy system utilizes a number of components that can be attached together with a hoverboard in a number of different configurations in order to expand the riding options of the user. In one embodiment, components include: a hoverboard, a saddle possibly with additional wheels and a stability bar, a plurality of straight handles, a plurality of curved handles, a plurality of accessory wheels, a split seat that independently actuates either foot pedal on a hoverboard, a fixed bench seat, pusher extension, and other components.

Disclosed are a hollow cylindrical component for a bicycle, a stem having a hollow cylindrical component for a bicycle, and a bicycle having a hollow cylindrical component or a stem. To allow lines of the bicycle to be installed in a simple, secure, and protected manner, the hollow cylindrical component has at least one line receptacle in the cylinder wall thereof.

A riding vehicle includes: a main body supporting a wheel and on which a steering stay and a seat stay are erected at an interval in a traveling direction; a handle provided on the steering stay; a pedestal portion fixed to an upper end of the seat stay; a seat rotatably connected to the pedestal portion, and configured to switch between a riding state where the seat stands upright to cover the pedestal portion from above so as to be in an arrangement suitable for riding and a cart state where the seat is inclined in a traveling direction away from the steering stay to open an upper portion of the pedestal portion so as to be in an arrangement suitable for conveyance movement with baggage placed thereon; and a stopper interposed between the pedestal portion and the seat and regulating the seat in the riding and cart states.