Work it out yourself (with a little help from some nerds and me, of corks): http://www.analyticcycling.com/ForcesLessWeight_Page.html
@hippy 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.
Work it out yourself (with a little help from some nerds and me, of corks):
http://www.analyticcycling.com/ForcesLessWeight_Page.html