My race and pit wheels are different. One set of rims is slightly wider, but the difference is not so drastic that it requires adjustment. Fortunately, the freehub body spacing in relation to the outer edge of the drive-side locknut matches up pretty well, so I can slap the spare in and go without worrying about RD adjustment. If yours don't match up, you can adjust the positioning of the outer edge of the freehub body in relation to the locknut on your spare wheels to match your race wheels; once this is done you won't have to worry about RD adjustment. You would do this by moving axle spacers from one side to the other; you may have to get some very thin spacers to get things to match up just right.