I'll preface this with a few things. I can't nor do I want to be able to do barspins, this is to settle a debate over whether such a piece exists. And I know that if a piece did exist, it would probably weaken the whole system. THAT BEING SAID: Is there such a spacer? All these people complain about wanting to do barspins, and it seems that going to a 650 wheel is not as easy as putting a 1" spacer in the system somewhere, maybe between the crown and the race?