http://www.wheelbuilder.com/white-industries-lockring.html says 1.290"×24tpi
@gbj_tester 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.
http://www.wheelbuilder.com/white-industries-lockring.html says 1.290"×24tpi