Whether you're restoring a vintage circle track car or just need to create a special wheel offset, Speedway offers separate steel wheel centers and shells for building custom wheels. These 15" wheel shells will accept steel centers with 12-5/8" O.D.Strong steel construction for heavy-duty use - Bare finish can be painted after assembly - Standard bead bump - No valve stem hole - Welding is required to complete the wheel assembly - Learn more about determining the proper wheel offset, torque sequence, and bolt pattern for your application by reading our tech article. Racing Wheel Principles.