Abstract: An article carrier for a motor vehicle comprising a pair of side rails adapted to be mounted to the roof of a vehicle in spaced apart relationship and extend longitudinally of the length of the vehicle. The side rails define a guideway therein, further defined by upper and lower surfaces. First and second pairs of stanchions are provided supporting a cross rail therebetween generally perpendicular to the side rails. Each of the stanchions have a bottom wall with engaging members integral therewith extending therefrom and received in the guideways and slidable therein. The guideways capture the engaging members therein and permit only sliding movements of the engaging members therein. A recess is defined in the bottom all of the stanchions and a clamping member is received in the recess. The clamping member is rotatable in the recess and has a camming portion extending into the guideway.