It had a spoked steering wheel and bucket seats. The throttle was controlled with a lever on the steering wheel. All had the required height adjustable steering wheel. Steering was by way of a toothed rack that pivoted the unsprung front wheel. This allowed clutchless shifting with a single selector mounted behind the steering wheel. They are designed for holding a steering wheel. Interiors have revised controls and a redesigned steering wheel. An axle is a central shaft for a rotating wheel or gear. It rotates with the wheel and axle. A driven wheel is an example of a wheel and axle. An Impala-style "Deluxe" steering wheel was optional. It is a contraption similar to a waterwheel with spokes of a bicycle wheel. Having to both pedal and steer via the front wheel remained a problem. The 404 introduced a concealed front wing-mounted spare wheel and battery. These are indicators for a high possibility of a locking wheel.