I'm not quite sure which forum this should go on but thought maybe us larger persons would be the most sympathetic. My wife (6' tall but not heavy) got a Fuji Roubaix last year as her first roadbike. But like me, at times, she feels nervous about the thin tires. So today I switch the 23mm tires that came with the bike for 28mms, and she really liked the sense of solidity they gave. The only trouble is that I then noticed that the rear tire was rubbing at the fork, and so changed it back, leaving the thicker one on the front.
So I'm wondering whether we should (a) sell the Fuji and get (e.g.) a Surly Crosscheck or (b) change to 650 wheels to allow the fatter tires. Option (b) seems a little perverse, but she does like the Fuji a lot (though I expect she'd like ANY nice road bike, esp. it were a bit comfort oriented).