Oversized bikes are especially dangerous.
A bicycle of the wrong size may cause the child to lose control and be injured. Take the child with you when shopping for a bike so that he or she can try it out. How to test any style bike for proper fit When sitting on the seat with hands on the handlebar, the child must be able to place the balls of both feet on the ground. When straddling the center bar, the child should be able to keep both feet flat on the ground with about a 1-inch clearance between the crotch and the bar. When buying a bike with hand breaks for an older child, make sure that the child can comfortably grasp the breaks and apply sufficient pressure to stop the bike.