A clamp assembly for securing a steering column shroud, comprising: a clamp pin which passes through an opening in the shroud and having a stopper towards one end, a toothed block carried by the clamp pin having a set of rake teeth, the teeth of the block being urged into engagement with a rack of teeth fixed to a support bracket by the stopper when the clamp assembly is in the clamped condition, thereby securing the relative positions of the fixed and moving portions of the steering assembly; and a biasing means that provides a biasing force that acts in an unclamped condition to bias the stopper of the clamp pin away from the moving part to permit the rack of teeth on the block to move clear of the rack of the support bracket, in which a substantial part of the biasing force provided by the biasing means acts upon the clamp pin without passing through the toothed block.