This Schwinn Koen boy's bike with 18-inch wheels is designed for children 3 - 7 years old or 42 - 52 inches tall. The Koen is perfect for riding to the park or riding on the sidewalk around the neighborhood. With Schwinn's SmartStart Technology, this bike is designed just for kids: lighter frame, cranks and pedals are positioned forward, gearing designed for easier starting, narrower pedal positions, and smaller grips and seat. Designed with younger riders in mind, this bike includes a rear coaster brake (reverse the pedals to stop) and a front caliper brake (hand-brake like adult bikes); easing the transition to a hand-brake-only bike when they