Hub-centric ring
A small ring that fills the gap between an oversized wheel centre bore and a smaller hub spigot, restoring centric loading.
A hub-centric ring is a precision-machined plastic or aluminium ring that drops into a wheel's centre bore to fill the gap when the wheel bore is larger than the hub spigot. Cost: typically $5–15 per set of four.
When you fit a wheel with a 110 mm centre bore on a 78.1 mm GM hub, the wheel sits on the studs alone — lug-centric — which causes vibration and stud fatigue. Drop a 110→78.1 mm hub-centric ring in each wheel before mounting, and the load is back on the hub spigot where it belongs.
Brands worth using: KICS, GORILLA, MCGARD, AAU, KSP — anything aluminium or impact-resistant ABS plastic. Cheap rubber-feeling generics deform under heat.
See also