Examples of the present disclosure relate to a bicycle configured to easily and efficiently adapt for riders of different sizes while providing both balance bike and pedal bike functionality. An exemplary bicycle is a children's bicycle designed and developed to grow with a child. An exemplary bicycle is configured to enable utility adjustments to a front assembly, among other components, which creates a setup that comfortably accommodates either smaller riders or larger-sized riders. The bicycle is adjustable with minimal effort and without tools, enabling re-configuration on the fly. Further disclosed is an exemplary training wheel device that is attachable to an exemplary bicycle. An exemplary training wheel device extends functionality of the bicycle and assist with training a young child to ride the bicycle.

Examples of the present disclosure relate to a bicycle configured to easily and efficiently adapt for riders of different sizes while providing both balance bike and pedal bike functionality. An exemplary bicycle is a children's bicycle designed and developed to grow with a child. An exemplary bicycle is configured to enable utility adjustments to a front assembly, among other components, which creates a setup that comfortably accommodates either smaller riders or larger-sized riders. The bicycle is adjustable with minimal effort and without tools, enabling re-configuration on the fly. Further disclosed is an exemplary training wheel device that is attachable to an exemplary bicycle. An exemplary training wheel device extends functionality of the bicycle and assist with training a young child to ride the bicycle.

Steering group of a motor vehicle including a front frame provided with a steering tube that rotatably houses a steering shaft or pin, which rotates about a steering axis, the front frame being provided with an upright integral with the steering tube, the front frame having a steering bracket (36), integral in rotation with the steering shaft where, the steering group includes elastic return means which elastically influence the steering shaft to position itself symmetrically with respect to the front frame, the elastic return means being interposed between the upright and the steering bracket so as to be compressed when the steering shaft rotates with respect to the central symmetrical position, wherein the elastic return means have a regressive trend elastic response.

Steering group of a motor vehicle including a front frame provided with a steering tube that rotatably houses a steering shaft or pin, which rotates about a steering axis, the front frame being provided with an upright integral with the steering tube, the front frame having a steering bracket (36), integral in rotation with the steering shaft where, the steering group includes elastic return means which elastically influence the steering shaft to position itself symmetrically with respect to the front frame, the elastic return means being interposed between the upright and the steering bracket so as to be compressed when the steering shaft rotates with respect to the central symmetrical position, wherein the elastic return means have a regressive trend elastic response.

Embodiments disclosed herein include an electric assist bicycle adapted for a both personal and public use, and subcomponents of the bicycle. The electric assist bicycle can include a hollow frame with one or more cables routed within the hollow frame. The hollow frame can be configured with an internal battery compartment. The electric assist bicycle can further include a modular electronic locking system.

Embodiments disclosed herein include an electric assist bicycle adapted for a both personal and public use, and subcomponents of the bicycle. The electric assist bicycle can include a hollow frame with one or more cables routed within the hollow frame. The hollow frame can be configured with an internal battery compartment. The electric assist bicycle can further include a modular electronic locking system.

A handlebar stem connection mechanism for connecting a handlebar stem with a front wheel fork comprises a steerer tube connectible with the front wheel fork. Further, a handlebar stem tube connectible with the handlebar stem is provided, the handlebar stem tube surrounding the steerer tube. Using a clamping element arranged between the steerer tube and the handlebar stem tube, the steerer tube is clampingly connected with the handlebar stem tube. For fixing, in particular a screw is provided in the clamping element as the fixing element.

A handlebar stem connection mechanism for connecting a handlebar stem with a front wheel fork comprises a steerer tube connectible with the front wheel fork. Further, a handlebar stem tube connectible with the handlebar stem is provided, the handlebar stem tube surrounding the steerer tube. Using a clamping element arranged between the steerer tube and the handlebar stem tube, the steerer tube is clampingly connected with the handlebar stem tube. For fixing, in particular a screw is provided in the clamping element as the fixing element.

A joint structure of a composite bicycle frame includes a base layer and at least one reinforcing layer. The base layer is made of a first polymeric matrix material doped with a plurality of first fibers. The first fibers have random fiber orientation, and the base layer has a first thickness. The reinforcing layer is adhesively connected to the base layer. The reinforcing layer is made of a second polymeric matrix material doped with a plurality of second fibers. The second fibers have a single fiber orientation. The reinforcing layer has a second thickness which is smaller than the first thickness of the base layer.

A joint structure of a composite bicycle frame includes a base layer and at least one reinforcing layer. The base layer is made of a first polymeric matrix material doped with a plurality of first fibers. The first fibers have random fiber orientation, and the base layer has a first thickness. The reinforcing layer is adhesively connected to the base layer. The reinforcing layer is made of a second polymeric matrix material doped with a plurality of second fibers. The second fibers have a single fiber orientation. The reinforcing layer has a second thickness which is smaller than the first thickness of the base layer.