An adaptor for a wheel assembly is disclosed. The adaptor has a reversible design for convenient reconfiguration of the wheel assembly without additional hardware. In one general non-limiting embodiment, the adaptor may include an inner ring and an outer ring fixedly connected to the inner ring. The inner and outer rings may be concentric around an axis. The inner and outer rings may be offset from each other. Methods of using the adaptor to change wheel configurations to accommodate different tire sizes are also disclosed.
