The invention concerns a traction control arrangement for a variator (10). The traction control arrangement has a traction control valve (119, 119a) which controls the traction load pressure and which is operable in at least two modes: 1) in a first mode, it receives (a) a first pilot pressure signal corresponding to the traction load pressure and (b) a second pilot pressure signal corresponding to the higher of the first and second reaction pressures, and controls the traction load pressure in response to the difference between the first and second pilot pressure signals; 2) in a second mode, it receives (a) a first pilot pressure signal corresponding to the traction load pressure, (b) a second pilot pressure signal corresponding to the higher of the first and second reaction pressures, and (c) a third pilot pressure signal corresponding to the lower of the first and second reaction pressures, and controls the traction load pressure as a function of the first, second and third pilot pressure signals. The relationship between traction load pressure and reaction force is different in the two modes and in this way provision is made to selectively alter the traction coefficient in the variator. According to a second aspect of the invention, a pre- stressed refiel spring acts in opposition to the traction load actuator.