A two-wheeler vehicle comprising a steerable front wheel of at least 16 (d.sub.f), a fixed back wheel smaller than or equal (d.sub.b) to d.sub.f. A distance between the back wheel ground contact point and the front wheel contact point is smaller than or equal to (12+(d.sub.fd.sub.b). A steering mechanism defines a steering axis ground contact point. A trail distance between the steering axis ground contact point and the front wheel ground contact point is between 5% and 10% of the d.sub.f. The steering mechanism comprises a fork, a yoke and a handlebar. A frame interconnects the yoke and the center of the back wheel and comprises a standing mechanism providing at least one footboard, below the back wheel center, extending laterally from the frame.

A lever driven bicycle with synchronous drive ratio control is disclosed. The lever driven bicycle may include a pair of drive levers pivotable around an axis. The lever driven bicycle may also include a force applicator connected to each drive lever, each force applicator configured to receive an application of a force to rotate a drive wheel. The lever driven bicycle may further include a control mechanism connected to the pair of drive levers, the control mechanism configured to synchronously adjust a drive ratio of each drive lever.

A lever driven bicycle with synchronous drive ratio control is disclosed. The lever driven bicycle may include a pair of drive levers pivotable around an axis. The lever driven bicycle may also include a force applicator connected to each drive lever, each force applicator configured to receive an application of a force to rotate a drive wheel. The lever driven bicycle may further include a control mechanism connected to the pair of drive levers, the control mechanism configured to synchronously adjust a drive ratio of each drive lever.

The invention relates to a bicycle (100) having a frame structure (200) that comprises a swingarm structure (225) including a first substantially U-shaped sheet metal part for holding a wheel (103), the frame structure further comprising a frame bridge (219) consisting of a second substantially U-shaped sheet metal part. The first U-shaped sheet metal part is bent substantially in a first bending plane (P) to form a first U-shape, and the second U-shaped sheet metal part is bent in a second bending plane (Q) to form substantially a second U-shape. The first bending plane extends substantially perpendicular to the second bending plane.

The invention relates to a bicycle (100) having a frame structure (200) that comprises a swingarm structure (225) including a first substantially U-shaped sheet metal part for holding a wheel (103), the frame structure further comprising a frame bridge (219) consisting of a second substantially U-shaped sheet metal part. The first U-shaped sheet metal part is bent substantially in a first bending plane (P) to form a first U-shape, and the second U-shaped sheet metal part is bent in a second bending plane (Q) to form substantially a second U-shape. The first bending plane extends substantially perpendicular to the second bending plane.

An electric balance bike includes an actuating assembly, a battery, and a power control system. The actuating assembly includes an actuator located below an intermediate section of a bike frame, a driving member located at an axle of a rear wheel, and a driving belt that is wrapped around the actuator and the driving member. The battery is detachably connected to the actuator. The power control system includes a controller, a power-on speed regulation control member, and a power-off brake control member, the controller is respectively electrically connected to the actuator and the battery, the power-on speed regulation control member and the power-off brake control member are located at the handlebar and are respectively connected to the controller to control the battery to supply power or not and control power outputting statuses of the actuator, so that a running speed of the electric balance bike is controlled.

An electric balance bike includes an actuating assembly, a battery, and a power control system. The actuating assembly includes an actuator located below an intermediate section of a bike frame, a driving member located at an axle of a rear wheel, and a driving belt that is wrapped around the actuator and the driving member. The battery is detachably connected to the actuator. The power control system includes a controller, a power-on speed regulation control member, and a power-off brake control member, the controller is respectively electrically connected to the actuator and the battery, the power-on speed regulation control member and the power-off brake control member are located at the handlebar and are respectively connected to the controller to control the battery to supply power or not and control power outputting statuses of the actuator, so that a running speed of the electric balance bike is controlled.

A bicycle frame assembly includes a frame including a first segment, a second segment connected to the first segment at a first hinge, and a third segment connected to the second segment at a second hinge. A synchronization cable extends through the second segment from the first hinge to the second hinge.

A bicycle frame assembly includes a frame including a first segment, a second segment connected to the first segment at a first hinge, and a third segment connected to the second segment at a second hinge. A synchronization cable extends through the second segment from the first hinge to the second hinge.

A two wheel tandem vehicle is propelled by hand-grasped poles. A front wheel on a forward member and a rear wheel on a rearward member align along a longitudinal axis. The forward member pivots about a substantially vertical steering axis. A saddle and footholds support the rider and together with an accessory contact means allow the rider to balance and steer the device. The rider's hands do not contact the vehicle but are used to propel the vehicle with the poles.