Adjustable seat support for a wheelchair

A seat support assembly for a wheelchair comprising:

• a seat bottom frame including
• at least two spaced apart beams, each beam including at least two channels formed in it that extend along at least a portion of the beam, one channel being formed in a bottom of the beam and the other being formed in a outwardly facing side of the beam, and
• a seat plate mounted to and extending between the beams,
• a plurality of seat mounting shafts for attaching the seat bottom frame to a frame of the wheelchair, at least one seat mounting shaft being adjustably attached to the bottom channel in each beam;
• and
• a seat back frame including
• two vertical supports, each support having an upper end and a lower end,
• at least one adjustable back frame cross-bar attached to and extending between the vertical supports, and
• a mounting bracket attached to the lower end of each support and attached to at least one of the channels in a beam.