Abstract: The present invention relates to a new wheelchair that is adjustable in length, width and height in order to be adapted to different users of different sizes or to a child growing up. The wheelchair comprises a T-shaped rear frame, a T-shaped front frame and a seat assembly. Each T-shaped frame is made of a long arm and two short arms. The rear frame and the front frame are telescopically connected together in such a manner so as to articulate both frame together and to allow to adjust the distance between the front and rear wheels. The two rear wheels are adjustably mounted to the rear frame so that the distance separating the wheels may be adjusted. The seat assembly is mounted on the rear frame and is adjustable in height. The front wheels are mounted on the front frame at each end of the two short arms.