Four ground contact points from the 12-inch wheels and detachable training wheels help kids practice balance while keeping the bike stable as they learn to steer. The 36 x 20 x 26 in frame is sized for riders 31.5-41.3 in tall, with an adjustable saddle that fits 16-18-in inseams so the bike can be set at a comfortable height. A front hand brake pairs with a rear coaster brake so children can slow down by hand or by backpedaling. The chain guard helps shield moving parts while kids ride, and the 110-lb capacity supports growing riders.