Wild guess, but maybe they are not double sided as they are intended for the track. Are any track hubs double sided? I know Dura Ace ones aren't.
@kerley 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.
Wild guess, but maybe they are not double sided as they are intended for the track. Are any track hubs double sided? I know Dura Ace ones aren't.