I'm suprised no one has mentioned this but the problem could simply be that the chainring is not perfectly round.
mentioned on the thread linked in the first post. nuff said.
@deleted 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.
mentioned on the thread linked in the first post. nuff said.