Vibrating doesn't always mean hub centric rings are necessary.
A few resons for vibrations furing certain speeds:
- Unbalanced wheel/tire
- Dented wheel (unbalanced)
- Bad wheel bearing
- Worn suspension bushings
For both sets of wheels I've had, I've never used hubcentric rings and have no vibrations. About two weeks ago I developed a vibration from 60-75 mph, I think the wieght fell off of a wheel or I dented a wheel.
Plus, a lot of times you can center the wheel just fine without rings by tightening the lugs carefully. I usually do them finger tight - 20 - 40 - 60 -80 lb. ft. so the lug pressure is even. Also, the tighter you can get the lugs while the wheel is in the air the better off you'll be. Most people lower the car so the tire contacts the ground so it won't slip while they're tightening the lugs. That can easily knock the wheel off center before the lugs are tight.