What advice is out there about touring bikes? I'm looking to do a trans-American bicycle trip and don't see any significant difference between the frames and wheels of a road bike and those of a touring bike, the only noticeable difference I've seen is in price. Is it just a lack of popularity that drives the price of touring bikes up, or is there another factor I am not aware of? Can I convert a road bike frame into a touring bike just by simply changing a few things (gears, brakes -for fixing luggage racks/panniers on the frame, etc.)? If there are any long distance riders reading this please let me know your thoughts