I have seen a few bikes marketed as "Expedition Bikes". They seem to be designed for the purpose of touring off-the-beaten-track. Typically they have 26 inch wheels and either butterfly or flat bars, ...
I want to buy a bike. These are the things I'm looking for: frame that can handle weight and light off-roading (eg, sand, gravel, rocks, roots, but no big drops) frame can accomodate fatter, ...