The sports wheelchair includes a frame portion (A) having left and right side frame portions. Rear wheel assemblies (B) are connected with the left and right side frame portions such that the rear wheels are connectable to the frame in any one of a plurality of positions and with an adjustable camber....http://www.google.de/patents/US4595212?utm_source=gb-gplus-sharePatent US4595212 - Folding sports wheelchair
