A front assembly for use with a rear module to form a riding vehicle is disclosed. The front assembly includes an elongate frame, a mount disposed beneath the elongate frame, a head assembly with a front wheel and handlebar, and a seat mounted relative to the elongate frame. The elongate frame terminates in two laterally spaced apart prongs removably securable to connectors of the rear module. The connectors and elongate frame together constitute a bicycle frame. The riding vehicle may be convertible between different configurations, such as a balance bicycle and a pedal bicycle, by interchanging rear modules. The rear modules may have different wheel sizes and connector geometries while maintaining compatibility with the front assembly. The riding vehicle may include features for partially encasing the mount in different configurations and may be foldable for compact storage.

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.

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.

A bicycle for driving downhill with a front wheel region, a rear wheel region, and a support rod which couples the front wheel region and the rear wheel region, the support rod having at least one hinge for unfolding and folding and has a front rod portion between the front wheel region and the hinge and a rear rod portion between the rear wheel region and the hinge, a foot rod is pivotably mounted with a coupling portion to the support rod and has a footrest region for resting feet of a user of the bicycle, and the bicycle includes a tension rope system having a first rope tensioning portion and a second rope tensioning portion, wherein the first rope tensioning portion is coupled to the foot portion and the front rod portion, and the second rope tensioning portion is coupled to the foot portion and the rear rod portion.

A bicycle for driving downhill with a front wheel region, a rear wheel region, and a support rod which couples the front wheel region and the rear wheel region, the support rod having at least one hinge for unfolding and folding and has a front rod portion between the front wheel region and the hinge and a rear rod portion between the rear wheel region and the hinge, a foot rod is pivotably mounted with a coupling portion to the support rod and has a footrest region for resting feet of a user of the bicycle, and the bicycle includes a tension rope system having a first rope tensioning portion and a second rope tensioning portion, wherein the first rope tensioning portion is coupled to the foot portion and the front rod portion, and the second rope tensioning portion is coupled to the foot portion and the rear rod portion.