In one embodiment there is a lumbar support system for fitting on a motorcycle or other similar vehicle. There is a bracket for connecting the lumbar support to the seat pan. There is a mechanism for pivotably connecting the bracket to the lumbar support. There is a mechanism for connecting the seat pan adjustably to a rear fender of the vehicle. The height of the lumbar support may be adjustable. The pitch and lateral position of the support may also be adjustable. There is also an air cushion with multiple chambers disposed within a recess in the seat pan, such air cushion and seat pad being covered with foam and a leather, vinyl or other cover.