This book is a good basis if, like me, you have no idea what screw or bolt does what when you look at your bike. It runs through the basics of adjusting the mechs, brakes, and all other parts of the bike with plenty of accurate pics. Could be a bit larger, but its is a very tidy sized book. It didn't cover every bolt on my bike, thats why the 4 stars. but for a basic get to grips its perfect - especially for the price!