Originally Posted by
melon
whats the deal with the big gap between the hub and sproket, is it ok to have that much spacer?
With a multispeed cassette all the cogs you aren't using are "spacer" whenever you aren't using them. So it'll be as reliable as the multispeed cassette was.
This is an excellent way to set up single speed on the cheap. I don't know about fixed, though - I've heard of people welding the freehub body to the hub but that seems pretty sketchy.