Because when it is turning , the ocntact point with the ground is at a constante distance from the centre of the wheel.
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A spinning wheel!
The most unique features are the round base and single rear wheel, which allow the chair to be turned in a full circle on the spot.
that mean the clock spring is bad and you need to replace it is behin the steering wheel is a round plastic box.
The small wheel has to turn more to travel the same distance as the larger wheel.
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