I worked on a bonfire like that, had the weirdest 1 1/8" to 1" bottom headset bearings..
Yes, stock headset was nuts but I managed to get it working with a 1 1/8" carbon fork in the end.
Did exactly the same for a friend.
@Hulsroy 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.
I worked on a bonfire like that, had the weirdest 1 1/8" to 1" bottom headset bearings..