A latch mechanism for a pivoting bicycle rack provides a pivot release actuator on an extension that is added on to the bicycle rack. The latch mechanism comprises a connector body that is attached to the bicycle rack, and that may have an actuator for operating the pivot release. The rack extension assembly has an actuator and a linkage that connects to the connector body in the bicycle rack so that the actuator in the extension can release the pivot on the bicycle rack. The connector body may be shaped to guide the linkage during the process of attaching the extension assembly to the bicycle rack.