In one aspect, a dishwasher includes a tub at least partially defining a treating chamber and defining an access opening, a dishrack, and a guide rail assembly slidably mounting the dishrack to the tub. The guide rail assembly has a guide rail mounted to the dishrack or to the tub and has at least one wheel which is rotatably mounted onto an integral axle of the guide rail assembly to the other of the dishrack or the tub.