it greatley depends on spoke design, believe it or not. Just becuase something is 40mm offset or 25mm fofset doesnt amtter if the spoke and hub design arent spaced out enough to not clip the caliper

make sense?if not, I can explain it a little better in the mroning, its 2am and I am..quite intoxicated...-chetalso: spacer usage get the user beat with a wiffle ball bat...yes, the big red one.