Perhaps try removing and re-installing the wheels, making sure to tighten the lug nuts in a star pattern to the correct torque. IIRC correctly the correct torque is 80 ft/lbs. The installer may have over-torqued the wheels. While the wheels are off, do a quick visual inspection of the brake pads and calipers to ensure there are no obvious signs of sticking or jamming and that the top and bottom lugs of the pads are adequately lubricated. If you elect to go with hub rings, the OD should be available from Volk. Check their website or just goggle "bore size of" whatever Volk wheels you have. As stated above, the hub rings are not absolutely necessary, but they do help center the wheel during installation.
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