650 wheels on a cross bike?

[MartianDestiny]

Rivendell's website & harris cyclery have various 650b options - I have no idea whether or not they're appropriate for cyclocross or not.

If you look at this sogn build:
http://www.flickr.com/photos/2567121...7615670220313/

That's the paul's motolite bmx brake. You can slide the brakepad up & down those cantilever brakes - so you can swap between 2 sizes of wheels with those. So you could swap on 700c's on a 650b bike.

I've been paroosing the 650b wheel options. Seems most of them are decidedly mountain and thus too wide. Those brakes look cool (and expensive ). I'll have to keep them in mind.