A rack for mounting on a spare tire assembly of a vehicle includes a mounting plate engagable to a spare tire mounting bracket of the vehicle, and a mast connected to the mounting plate in a substantially vertical position. The rack also includes a shoulder member connected proximate a top end of the mast and mountable proximate the top end of the mast using a connector at more than one position along a horizontal axis relative to the mast. A hub assembly is connected to the shoulder member, and a pair of arms are connected to the hub assembly that are configured to carry one or more bikes.