The Thule VeloCompact 7-pin is a stylish and efficient carrier. It's pre-assembled so no tools are required, and it's easily folded and flattened, so it can be safely stored in your boot when not in use. The carrier has easy trunk access even with your bikes already mounted, and it carries bicycles with large wheelbases due to having extendable wheel holders. By adding a fourth adapter, the carrier will have the capacity to carry a fourth bike.