Adjustable Seat Assembly with Operator Controls for Riding Vehicles

Systems and mechanisms for facilitating concurrent positional adjustments of a seat with one or more steering controllers along a longitudinal direction of a vehicle, are disclosed. The embodiments provide a mechanism by which operators of a wide range of body types may comfortably occupy and use vehicles configured with lap bar controls, such as zero-turn radius mowers. In one example, the seat and steering controllers are both mounted on a support structure that is configured to be movable relative to a chassis of the vehicle.