14 Nm is way too much. I wouldn't want to go higher than about 7 Nm on a seatpost clamp bolt.
@Regal 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.
14 Nm is way too much. I wouldn't want to go higher than about 7 Nm on a seatpost clamp bolt.