A wheelchair includes a chassis, a positioning module, a seat frame, and a seat. The positioning module is mounted to an upper portion of the chassis. The seat frame includes a support member secured to and spanning a seating area of the positioning module and a front frame member secured to a front end of the support member and overhanging a front edge of the seating area of the positioning module, such that the seat frame at least partially straddles the positioning module. The front frame member is connected with and at least partially supports at least one of a side frame member, foot rest, leg rest and arm rest assembled with and supported by the front frame member. The seat is secured to an upper surface of the support member.