Salsa's recommended size chart...?

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Sounds like the small is the way to go. Medium is probably pushing it. Although your Cannondale looks pretty sweet as I checked out your blog.

Thanks! My 11 year old DS has fallen in love with that bike. It's the only one he wants to ride. He's pretty fearless on it and it's a pretty good fit for him, too. By next Summer it should be a perfect fit, unless he grows a ton (which could happen, though I'm totally not ready for him to be almost as tall as I am!).

Yeah, I think a M would definitely be too big. My guess is standover would be an issue with that, too.