Start small and grow tall with just one bike. The 2-wheel version of the award-winning Wishbone 3-in-1 Bike is one of the smallest and the tallest balance bikes on the market - All in one! With the unique, flippable wishbone frame and the adjustable seat, this bike can stay with your child from about 18 months to 5 years. If you need a third wheel for a tricycle configuration, you can add the Wishbone Trike Kit (sold separately).