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Up to now, if you wanted a tight-turning riding mower or tractor, you lived with two awkward steering levers. The John Deere Spin-Steer SST16 is the first "zero-turn-radius" tractor that uses a steering wheel to control its rear-wheel steering system.
Moving the steering wheel partway turns this tractor by slowing one rear wheel. Moving it all the way left or right at low speed makes the rear wheels rotate in opposite directions, letting the Spin-Steer turn 360-degree circles in one spot. To go straight, you allow the steering wheel to return to its center position. The turning radius widens as speed increases, ...