Soft Science of Road Racing Motorcycles is quit a good book for tuning your race bike. But it's intended for recrational use. For real racer's it's to basic. While tuning my own bike it was usefull to use the books. The comments are also very handy. It does explain tunning a lot of different bikes so it can be very wide used. All in all it wasn't a bad book at all espiaccialy if you are a 'recrational' racer!