Has anybody gone on a 4-5 day tour w/ 650B wheels? just wondering how this would compare to 700C wheels. I've got 650B wheels on my 1980's Specialized Sequoia and am thinking this would make a decent touring bike. I feel the 650B wheels handle pretty well but can be pretty sluggish on hills -- both up and down. Would it be worth it to put $200 or so into a 700C touring wheelset (from Harris Cyclery) or can 650B wheels be pretty comfy on tour? I should add that I'll probably be carrying around 40 lbs of gear.