Adjustable handlebar and saddle let this kids sport bicycle match different riding positions, with the 18-inch size offering a 23.5-27-in saddle height for growing riders. Four wheel sizes share the same metal frame design, ranging from a 34.5 x 19.5 x 25.5 in bike for younger children up to a 49.5 x 21.5 x 32.5 in bike for taller kids. A dual brake setup combines a hand brake with a coaster brake, and the seat supports up to 145 lbs. Two detachable training wheels help young riders keep balance as they develop coordination and confidence on the bike.