Abstract: A bicycle rack (10) may be supported by a base (40) on a tow bar of a vehicle. The bicycle rack (10) includes an upright post (11) having at its upper end a pivotally supported arm (12), which is adapted by way of grooves (20) to support a number of bicycles by engagement with the bicycle top tubes. To retain the bicycles in place, a retaining plate (13) is held against the pivot arm (12) by wing nuts applied to threaded fasteners (19) and a padlock which may pass through a hole (22) and a corresponding hole in the pivot arm (12). A gas strut (18) extends between the post (11) and the pivot arm (12) to aid in its pivoting. A number plate support (23) is pivotally attached to the remote end of the pivot arm (12) and connected to the post (11) by a parallelogram linkage to maintain the number plate in a generally vertical plane regardless of the orientation of the pivot arm (12).