Originally Posted by
FBinNY
Yes, adding spacers behind the cassette is a common practice, and there's no negative consequences. Add enough so that the front lip of the cassette overhangs the freehub body so the lockring can compress it without bottoming against the freehub.
However, before buying the new wheel make sure that the overall axle width matches your frame. Or you could spread the frame if necessary.
So there's no serious reason not to buy and adapt these wheels, but IMO you'd probably be better off with wheels that match the bike, unless you're planning for future upgrades.
I do plan on making future upgrades to this bike, but as far as the gearing, as the guy above specified, the splinelines of the gears may be different. I have 6 gears in the back and I don't know if it's a freewheel or a cassette. Most likely, it's a freewheel, but I need to know the difference, so I will know what to look for for future wheel purchases...