217 these are used to facilitate provision of oil fluid referred to as u201c traction fluid u201d to the rollers the roller is thereby cooled and a film of the fluid is maintained on the roller surface between the variator discs and the rollers as the skilled person is aware drive is transmitted through this fluid film by virtue of shear thereof to explain now the function of the resilient spacer 206 it must be appreciated that in operation the two variator discs acting on the roller 102 exert a large compressive force along a diameter of the roller tending to deform it somewhat such as to reduce the roller 39 s outer 200 and inner 202 diameters along this direction if this compressive force were transmitted to the rotary bearing 204 and to the ball and socket joint 208 210 the effect would be to cause them to tend to bind wear on the rotary bearing 204 and frictional losses therein would be undesirably increased to avoid this problem in the illustrated embodiment the roller 102 itself can be understood to form a hoop bearing the compressive force the spacer 206 interposed between the roller and the bearing arrangement couples one to the other but accommodates the aforesaid deformation of the roller hoop due to the compressive force without transmitting this force to the bearing arrangement the spacer may be formed as a band of corrugated spring steel such components referred to as u201c tolerance rings u201d are known in themselves for use e g.