If it's not too late, I'd like to weigh in. All of the titles suggested so far are nice, but could be the title of almost ANY book about any bike trip.
Some of the best titles are drawn from the text itself. Find a particularly good line, a phrase in the book that evokes the spirit or the sense of the whole. Some small group of words that is evocative of the story itself. Use a part to represent the whole.
This gives the title an immediate and forceful connection to the tale it introduces, gives a sense of you guys as writers, and is something undeniably unique and true to this work.
Ultimately, I think no one here can give you a title, as we haven't read the text. You don't want a title for A book about touring Pakistan/India/Nepal/Bangladesh, you want a title for your book about touring Pakistan/India/Nepal/Bangladesh.