What is the best material for children's bicycles

Children's bicycles have good, moderate line design, to ensure that children will not affect the body shape development when riding. For example, some manufacturers of the body of the design of the imitation of the sport bike, the body design is too long, so that the child must bend to ride, this will affect the child's spinal development, so that it will not walk unconsciously bent. In the selection of materials, children's bicycles try to choose strong materials such as high carbon steel, because children learn to ride easy to fall, the strength of steel is easy to damage. Although the strength of aluminum magnesium alloy is also good, the body is too light, which is not suitable for children who are just learning to ride bicycles, and it is easy to cause danger because of riding too fast.