The stock wheels are hub centric. Lug centric works just fine (with coned nuts) when torqued evenly in the right pattern, but if the lug holes are particularly oversized or you torque the nuts unevenly it will no longer be centered very well. Just from my experience the couple of dollars for the rings was worth it for having zero vibration every time I put a wheel back on. I noticed that a bit of vibration would pretty quickly loosen all the nuts on that particular wheel which was my main reason to get the rings. Not using them can work out perfectly fine though, and of course with anything this fine individual results will vary.