A sliding support arrangement for supporting a slidable element in a closure of a roof assembly for a vehicle with respect to mutually orthogonal X, Y and Z directions, comprising at least a guide rail extending substantially in the X-direction. The slidable element carries a slide shoe engaging the guide rail and supporting the slidable element at least in the Z-direction. The slide shoe includes a first part fixed to the slidable element and a relatively movable second part. The second part is supported by the first part mainly through a spring urging the slide shoe parts in engagement with walls of the guide rail. The spring exerts a force which is directed at a non-perpendicular angle to at least one wall of the guide rail.