if you're going to track a wheel with it, then aluminum due to heat.
if you're just streeting, then plastic (or composite) is fine.
the wheels are lugcentric by design...meaning, those rings are there only to aid
the installer to get the wheels centered up to the hub, it does not physically support the
weight of the wheel like the factory hubcentric wheels.
that said, i dont run centering rings on some of my aftermarket wheels.
no vibration issues.
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