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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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@Sam
According to VeloBase.com they're JIS.
http://www.velobase.com/ViewSingleComponent.aspx?ID=7C3884AE-E2CD-4ED9-A32E-B1934F767D1E&Enum=115&AbsPos=2