The rings are ONLY if you have wheels intended for mounting on a newer-than-E34 5-series. The E34 wheel hub is about 1cm smaller than the E39 wheel hub, so a ring is needed to close this gap. If you have stock wheels - this does not apply to you.Originally Posted by silverz06vette
Most aftermarket wheels are made with an E39 hub size because it's simple to use a ring and it makes the wheels usable to a much larger market.
But, with the age of your arms - I'd say it's thrust arm time. DO get a good wheel balance done FIRST just to rule out the simple and cheap option.