1 1/4" threaded headset
Chris King? Don't know whether the stack height works, but they do actually make 1.25" threaded headsets, both 2-nut and Gripnut versions.
Thanks, Tester!
@rodabod started
London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
Chris King? Don't know whether the stack height works, but they do actually make 1.25" threaded headsets, both 2-nut and Gripnut versions.