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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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@gizmond
http://www.sheldonbrown.com/gloss_ha-i.html#headset
Threaded headset sizing
'**1" Italian **(25.4 mm)7/8"(22.2 mm)26.5 mm,
27.0 mm30.2 mm24Obsolete. Threads are cut at 55 degrees, but ISO or J.I.S. headsets can be used. '