The Invacare Tracer IV wheelchair features dual axle positioning allowing for a variation of seat-to-floor heights and its durable, low-maintenance, carbon steel frame is long-lasting. Corded urethane rear tires provide a 350 lb. weight capacity while pneumatic flat free tires allow for a 450 lb. weight capacity. "No flex" wheels offer superior performance and dual sealed precision bearings provide a better ride. Heavy-duty inner liners keep the seat and back from stretching and the upholstery is dual embossed.