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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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@Build
Shimano DA NJS Keirin hub axle conversion kits. Bad news is they were discontinued for 2008. You can convert a 120/10mm to a 100/9mm. Or the rarer 110/8mm, 100/8mm.
If your stuck I can speak to Seiya.