Id rather avoid spacers at all costs. just cause they arne't hub centric. And I relaly don't have to buy $100 H&H spacers.WyrmMaster said:40 is PROBABLY safe, although I have heard of it being very close. You might want to look into some 2mm or so spacers if you have issues with it, but spacers that small are very cheap (15 bucks on ebay).