Book excerpt: Cycling is more popular than ever before: it's healthy, it's cheap and it's better for the environment. People are dusting off their bicycles both for convenience and exercise, or investing in new models. But what do you do if things go wrong with your bike? Most bike problems don't require a visit to a specialist - you can fix it yourself with the right set of a spanners and a little know-how. The Bike Repair Book is your one-stop shop for fixing all bike-related issues, from punctured tyres, brake and gear problems, to broken chains. Illustrated with clear graphics and step-by-step instructions, you'll save money and time by repairing your bicycle yourself.