Question about Crank Types
 

So I bought a Sugino RD crankset. You know. Like everyone else, because they are cheap, and the place sent me a Sugino RD 5000 Direct Drive. Now this crankset is indended for mountainbike use, but also costs 100 dollars more than the one I bought. I know the right thing to do would be to inform the company of its error, but they pissed me off, backordering something without telling me, sending me the wrong products, and on top of that it took 3 weeks to get.

Anyways. The question:

Is there a huge difference in mountain bike and single speed cranksets? Can I just throw a 44t chainring on it, and everything should be fine, or would it be advised to get a dedicated single speed crank?

I think that the only real difference will be the chainring being ramped/pinned to shift...so, if you put a single speed ring on, it shouldn't be a problem. I don't think there is a spacing difference; anyone else have a more definitive answer on the spacing thing?

There's some chance of the MTB cranks being a little heavier, but probably stronger.

sell them.. profit.. then buy the right cranks?

Thought about it. I hate selling stuff. They are on craigslist right now, to see if I can get anything for them. What about e-bay and thanksgiving week. Is selling bad around this time, or is it better?