Overall, a useful book that provides some thought-provoking discussion regarding issues such as cadence, crank length, suspension benefits, frame material selection etc. However, it is rather dissappointing in that its primary focus is on the design of machines for speed and downhill racing. It lacks consideration of design evolution for bicycles used as day to day transport means, with all the design compromises that this involves. I still await publication of anything useful on this topic, although I note that W H Smith list "Cycle History" by Nicholas Oddy et al as appearing soon. I look forward to seeing how that shapes up.