The artillery wheel was a nineteenth-century and early-twentieth-century style of wagon, gun carriage, and automobile wheel. Rather than having its spokes mortised into a wooden nave (hub), it has them fitted together in a keystone fashion with miter joints, bolted into a two-piece metal nave. Its tyre is shrunk onto the rim in the usual way but it may also be bolted on for security. The design evolved over the nineteenth and early twentieth century, and was ultimately imitated in drawn steel for auto wheels which sometimes show little immediate resemblance to most of their design ancestry.