Two stages of learning sit in one frame. A 2-year-old starts out pedaling on three wheels, and when that stops being a challenge the pedals pop off at a button so the same frame teaches balance instead. The 13-in seat and open step-through mean a child 35 in to 43 in tall can climb on without being lifted every time. Solid EVA tires never need inflating or patching and hold their grip on smooth indoor floors. Carbon steel tubing under molded panels carries loads up to 66 lbs at just 7 lbs total. Meets ASTM and CPSIA.