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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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@Smallfurry
Does it have one of these?
http://www.fullspeedahead.com/storage/insidetech/items/EN_cd23382e-7b8d-489f-8172-234f31524569_Orbit%20IS%20Carbon.pdf
Mine had a bloddy 17mm stack. Down to 8mm now. Pretty sure we want 45mm diameter / 2mm lip.