interference with the stock brake system. My 90 has the aluminum calipers. I now have the Ashspec BBK and use a spacer to attain clearance. That being said if you're having problems with the spoke of the wheel hitting the caliper you need to check a few things . When I had the stock set-up the clearance was about .020 between the lettering on the caliper and the wheel. It wouldn't take much, say a worn bearing in the hub to relax the wheel enough to interfere. Also, it may be possible that ADR has changed the machining process or is using a different manufacturer to make the wheels since I purchased mine.