Read http://www.sheldonbrown.com/ cover to cover first, it'll give you a good grounding on bike tech & maintenance.
@Dangeruss started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Read http://www.sheldonbrown.com/ cover to cover first, it'll give you a good grounding on bike tech & maintenance.