thereto in a similar manner to that of a skateboard the mounting member 26 further comprises a pair of flanges 40 extending upwardly from the base member 36 in a substantially opposed and parallel manner the flanges 40 are provided in a substantially triangular form being broadest at their base 42 at which they are attached formed integrally with the base member 36 adjacent an apex 44 of each flange 40 there is provided a pivotal mounting to the forks 22 comprising a hollow tube 46 extending between the apex 44 of the flanges 40 and through which is received a bolt 48 the bolt 48 further locates about the pivotal mounting a first pair of fork members 50 each fork member 50 has fixedly attached thereto an intermediate member 52 connecting in turn to a secondary mounting member such as a fork member 54 of a second pair of fork members the fork members 54 extend upwardly and converge to form a neck portion not shown that is received rotatably through the neck 24 of the frame 12 in known manner the fork members 50 have extending therebetween a first fixing point 56 for a biasing means for example a spring 58 the fixing point 56 comprising a pair of members 60 mounted to the members 50 and defining a pair of matching apertures through which a hook 62 of the spring is received the spring 58 is located at its other end about a lug 64 projecting between the flanges 40 the lug 64 is spaced forwardly with respect to the tube 46 such that contraction of the spring 58 will cause the mounting member 26 to pivot about the.