Teeth count is used as a substitute for diameter for simplicity's sake. You have removed a tooth, not decreased the diameter.
@Aroogah 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.
Teeth count is used as a substitute for diameter for simplicity's sake. You have removed a tooth, not decreased the diameter.