The creative process of the design was constantly challenged, within restraints imposed by mechanical technology, to obtain an overall light enjoyable product without the tubular appearance of wheelchairs.

Regular bicycle wheels are turned by pushing hand-levers horizontally, which is the best movement for these youngsters. The vertical steering system allows them to turn while working the levers, with easy front-wheel steering and a rear-wheel drive that requires less effort.

Tricycles for the physically disabled are driven by turning a hand-lever similar to bicycle pedals. To steer the vehicle the user must stop driving in order to work a small steering lever. In another case where there is no lever, the user turns the fork where the hand-lever is fixed, also obstructing the turning movement, and with the feet moving together. This is why I have looked for a solution that would combine the two movements, propulsion and steering, so that one does not get in the way of the other.

In a sitting position, when we pull the lever we use our feet as support, and when we push we use our backs. For a paraplegic child, the best thing would be to push, even if pulling is possible, because the child is secured on the seat by a safety belt. Also, the strength in our arms is greater when we push than when we pull.

It is very important for the child to be able to reverse the tricycle should it encounter an obstacle, without needing outside help. It would not be desirable to create a situation of dependence. A small reverse gearlever is located alongside the seat.