- Sheldon Brown’s Bicycle Technical Info
One of the most comprehensive cycling sites on the web. This site is particularly useful for fixed wheel converters.
- eHow Bicycle riding and maintenance
A collection of instructional articles and videos
- Bicycle Tutor
Lots of how-to and diy repair videos
- Park Tool repair help
An extensive blog with repair articles. Also, each tool on the Park Tool web site has its own instruction manual!
- Bike collective network shop manual
A wiki with a number of repair articles, from beginner to advanced.