Wheelchair specifications for wheelchair competition

In wheelchair racing, athletes must use special wheelchairs to compete in track and field. This special wheelchair is a racing wheelchair. A competition wheelchair must have at least two big wheels and one small wheel. The diameter of the big wheel, including pneumatic tires, shall not exceed 70 cm, and the diameter of the small wheel shall not exceed 50 cm. In order to make the wheelchair difficult to fall over, the rear two wheels of the racing wheelchair must be opened. In addition, the maximum height of the wheelchair chair from the ground should not exceed 50 cm. No mechanical devices or levers are allowed to drive the wheelchair. Only athletes can drive wheels or crank forward. Wheelchair players also need to wear safety helmets, special gloves and goggles during the competition. Before giving the order, the outermost tangent of the small wheel shall not exceed the inner edge of the starting line. When you reach the finish line, stop the watch so that the outermost tangent of the wheel hub touches the inner edge of the finish line.