Method of making a convertible push-bicycle

A kit for converting a bicycle from a pedal-powered bicycle to a push-powered bicycle, comprising:

• a collapsible crankset, the collapsible crankset (i) including a spindle, two crankarms, and two collapsible pedals and (ii) configured to be convertible from a pedaling position to a backward-retracted position;
• wherein,
• the spindle is connected at each end to one of the two crankarms, at least one of the crankarms reversibly articulating with respect to the spindle up to at least about 180 degrees through a reversibly fixable hinge joint, the articulation of the crankarm retracting the crankset from the pedaling position to the backward-retracted position;
• each of the pedals articulating with its respective crankarm from (i) the pedaling position in which each pedal is at least substantially normal to its respective crankarm to (ii) the backward-retracted position in which each pedal is at least substantially parallel with the position of its respective crankarm for collapse into the housing to protect a child's legs;
• and,
• the crankset remains entirely intact for converting from a pedal-powered bicycle to a push-powered bicycle without requiring disassembly and re-assembly of the crankset during the process of teaching the child how to ride the convertible push-bicycle,
• conversion adapters to install the articulable crankset into a bicycle having a frame;
• a housing operably connected to the frame and having a recess configured to receive the two crankarms and the two collapsible pedals in the backward-retracted position for protecting a child's legs from the collapsible crankset in the backward-retracted position;
• and,
• instructions for assembling the articulable crankset into the bicycle and converting the bicycle from a pedal-powered bicycle to a convertible bicycle that can also function as a push-powered bicycle.