The bicycle is one of mankind's greatest inventions - and the most popular form of transport in history. Robert Penn has ridden one most days of his adult life. In his late 20s, he pedalled 40,000 kilometres around the world. Yet, like cyclists everywhere, the utilitarian bikes he currently owns don't even hint at this devotion. Robert needs a new bike, a bespoke machine that reflects how he feels when he's riding it - like an ordinary man touching the gods. "It's All About the Bike" is the story of a journey to design and build a dream bike. En route, Robert explores the culture, science and history of the bicycle. From Stoke-on-Trent, where an artisan hand builds his frame, to California, home of the mountain bike, where Robert tracks down the perfect wheels, via Portland, Milan and Coventry, birthplace of the modern bicycle, this is the narrative of our love affair with cycling. It's a tale of perfect components - parts that set the standard in reliability, craftsmanship and beauty. It tells how the bicycle has changed the course of human history, from the invention of the 'people's nag' to its role in the emancipation of women, and from the engineering marvel of the tangent-spoked wheel to the enduring allure of the Tour de France. It's the story of why we ride, and why this simple machine remains central to life today.