So they've machined a wider diameter flange and riveted that on? Clever
riveted
Looks more like they've threaded the spoke holes in the hub and bolted it on
Edit: too slow!
@atk 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.
So they've machined a wider diameter flange and riveted that on? Clever