A vehicle sliding door mechanism is arranged to move a door from a door opening provided in a vehicle side body structure from a closed position to an open position. The sliding door mechanism comprises an upper slide rail and a lower slide rail fixed to the vehicle side body structure. An upper slider is associated with the upper rail and is movable along the upper rail, and a lower slider is associated with the lower rail and is movable along the lower rail. An upper link assembly operatively connected to the vehicle door and the upper slider, and a lower link assembly is operatively connected to the vehicle door and the lower slider. At least one link assembly of the upper link assembly and lower link assembly is configured to control a moment of force about a pivot axis while moving the vehicle door between the closed position and the open position. The moment of force is one of an opening moment and a closing moment and is dependent on a position of the vehicle door relative to the vehicle side body structure. The at least one link assembly is configured such that the moment of force is substantially zero between when the vehicle door moves between the closed position and the open position.