Originally Posted by Aeroplane
Sorry dude, I've done both ways (27 rear, 700 front, and the reverse). You'd have to be some sort of Jean Grey mutant in order to sense the difference.
I tried that too and could sense the difference at first..sorta like getting on someone elses bike. But its so slight that it doesn't really matter and the feeling of it being slightly different goes away after a few blocks, so its basically irrelevant. I've used different size tires on my mountain bike and the difference there is similar, but again, it doesn't result in significant handling differences.