I commute on a stock Surly Cross Check complete, and the time has come to replace the tires. The stock tires are 700x32's.

I would love to put Big Apples (I'm looking at the 29x2.0) on my bike, but I'm worried that the rims are not wide enough and wanted to see what experiences people might have had. Would I need to build a real 29'er wheel to run a tire like this?

Any thoughts? Other suggestions (I'm also considering the Marathons in one of their iterations, etc., etc.) . . .

thanks--