Question for input. Jeep #2 is a 98 XJ with 245 pro comp at's on '03 rubi rims. Had a shimmy since placed on jeep. Only between 50-55. Tires have been road balanced, rims match balanced. Front end is tight, alignment is spot on. New tie rods, ball joints, and track bar is tight. The tire guy, who has some time under his belt, said with the lugs tight he still had a little "up and down" movement of the wheel. He feels that the rubi rim's center bore is bigger than the hub and this is the cause of the shimmy. He recommended hub centric rings to correct this gap. Sound plausible? I assumed the wheels would be fine when I put them on. Anyone have any experience with these and if so what size?