ok well I'll spill the beans. The frame I've been considering is a '68 Carlton Flyer that I've been wanting to set up with a IGH, drop bars, kinda like an old raleigh lention or club racer type thing. I'm considering 650b because I also want to run a wider tire to accommodate my new commute which will be a few miles on a hard packed gravel trail. I was also hoping to use my gold Mafac brakeset, but I suppose I'm ok with saving that for my px-10 build.
So basically, I have no idea if my Carlton was meant originally for 27's or 700s. I got it as a frame-set. I'll have to measure and see what's what.
BTW - 2,000th post!
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I have some bikes.