Hub centric rings remove the gap between the vehicle hub and the wheel bore. This makes them hub centric and wheel centric unlike some lengths of spacers (anything else under 13mm cannot be hub centric and wheel centric for aftermarket wheels.) Bought some hub centric rings and installed them and it was smooth as glass. I was talking about the same shank that you are mentioning. I had a slight annoying vibration that I could not diagnose as a driveline or tire balance in the seat of the pants. Though hubcentric rings are designed to allow the weight of the wheels to rest on the hub rather than the lugs as others have stated, depending on your wheels and lug nuts a hubcentric ring may not be necessary (or even do anything for that matter). Hub centric rings can help to eliminate this vibration. unch: Come on, surely more 8thcivic members have experienced these problems and used hub centric rings. Mod links