? Tricycle the rider makes a pair of front wheels change directions by shifting the center of weight and moves forward by rotating the rear wheel. The hand & foot trike can be also converted into a manual tricycle designed to be driven with both hands and both feet. There are also new hybrids between a , a recumbent bike and a tricycle, these bikes make it even possible to cycle with legs despite a spinal cord injury.

? Tricycles are typically used by children between the ages of two and four, after which point they usually switch to a bicycle, often with training wheels. Parents choosing a tricycle for their child should ensure that the trike is not too tall and that the seat is too high, and that the wheelbase is wide enough, because if this is not the case, the child may tip over easily. The seat should be stable, which is not always the case with the most inexpensive models. Some trikes have back rests which provide support and a push bar for parents so that the parents can push the child up hills or hold the child back when descending, or in case of the sudden approach of other traffic. For safety many parents make children wear a helmet when riding a trike. Some parents also attach a safety flag to the trike so that the child will be more visible to drivers.