I know there have been a lot of these threads lately popping up. But will the front tire of either of these bikes (or the messenger) have clearance for a barspin?

I don't plan on doing tricks all the time, but I think I might get the itch to do it once in a while.

If they do not have clearance, would going to a 650c front wheel fix that? Would I need a new fork for that? What are the pros and cons of this? I usually don't like the look, but other than that. Does it affect the ride comfort or anything like that?