Spigot Rings / 75.1 mm - 63.4 mm. Spigot Rings, for use to decrease the bore of your wheel hub. Alloy Wheels Spigot Rings / Centre Rings / Hub Centric Rings. Spigot Rings D1 (mm) - D2 (mm). The Spigot Rings are made from Polycarbonate (PC) Plastics.