I'm guessing the obvious book that most would choose would be by my friend Ted Simon's, Jupiter's Travels. It's and interesting, sometimes quirky and definitely enlightening read.
All about his travels on his four-year journey through 126,000 km across 45 countries on a Triumph Tiger 100, 500cc motorcycle from 1973 to 1977.
He received a boost in notoriety when he was mentioned and then appeared on Long Way Round with Ewan McGregor.
...and then the follow up book, Dreaming of Jupiter, where Ted, 24 years later, at the age of 69, decided to retrace his journey. How much had the world changed? How much had he changed?
Another good read is Lois Pryce, Red Tape and White Knuckles.
Riding Solo, unafraid of a challenge, Lois Pryce began the kind of adventure most of us could only ever dream of. She put on her sparkly crash helmet, armed herself with maps and a baffling array of visas, and got on her bike. Destination: Cape Town - and the small matter of tackling the Sahara, war-torn Angola and the Congo Basin along the way - this feisty independent woman's grand trek through the Dark Continent of Africa is the definitive motorcycling adventure.
...but to me the book by Robert Edison Fulton Jr, One Man Caravan, about his solo round-the-world tour on a two-cylinder Douglas motorcycle between July, 1932 and December, 1933. First published in 1937 tops the list.
For some reason the book on Amazon has a very premium price right now, but if you can find a secondhand version in a book store it is definitely worth the read.
If you can find the movie that was created from his 40,000 feet of film shot called Twice Upon A Caravan, that brings it all alive and is narrated by Fulton which also adds to the films character.
Here is an small extract of the movie
Sadly he died in 2004 but there is a very interesting Wiki page on him, and his life, family and some of the 70 patents he created.