Rack and pinion gear assembly

In a rack and pinion gear assembly, the rack bar 2 is substantially T-shaped in lateral section for roll stabilisation of the rack bar. The cross bar of the T-shape provides a head portion 2b and the stem of the T-shape a rail portion 2a which rail portion is adapted to slide longitudinally in a recess in a non-rotatable bearing means 8 of the gear assembly. Preferably the bearing means is in the form of a saddle. In the recess of the saddle an end surface of the rail portion remote from the head portion is in contact with the saddle and transversely extending side surfaces 2c, of the head portion 2b are not in contact with the saddle 8 when the rack bar is not under load, the side surfaces being adapted to contact the saddle when the rack bar is under load. <IMAGE>