Abstract: A back support adjustment system including a flexible suspension system having an adjustable and interchangeable flexing means positioned in between a frame and a support member. The back support adjustment system further includes an adjustable back support system having a housing integral with a back support surface and a tension assembly movable within the housing. Both the tension assembly and the adjustable back support system are adapted to engage the frame so that the movable tension assembly adjusts the tension of the adjustable back support system and the adjustable flexing means controls movement of the flexible suspension system.