Can't tell you how helpful this manual was when I was rebuilding an old bike. I bought it as the only comprehensive book on the subject - covering everything from tweaking your front suspension to putting on a new rear derailer to rewiring your brakes. And it continues to come in handy when I need to make the day to day tweaks of my current ride. It is as in-depth as you could want - making it useful for both the basics to the extremely advanced fixes you'd want to make. Done with clear photos & diagrams using simple to understand terminology. Would recommend it as a must have for anyone who wants the ability to fix a bike themselves instead of taking it to a mechanic. ( )