Originally Posted by techsensei

The manufacturers usually do not make bike-specific manuals, just one for the entire brand. While some manuals are a little better than others, mostly they are generic and rudimentary. Sometimes a few component instruction sheets are thrown into the box, but often nothing is provided. That's partly why LBS technical service is often lacking: mechanics generally receive no formal training, and are left to figure out new equipment on their own. The other side of the coin is that the often-not-included written manuals are poor at communicating how the components are to be adjusted, so the mechanic has to figure it out anyway.

You'd be lucky to find a shop who had technical staff that went to a bicycle technical school or even a seminar, and/or a "wrench" who has been doing it for years, as opposed to only doing it as a summer job before going off to college. It's not a career choice for most, because the pay is low. The wages aren't going up either, even though bicycles have gotten a lot more complicated.