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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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@jeff80
I'm building my wife a flat bar road bike for commuting. Have picked up a Tiagra 4600 chains but know nothing of Shimano-can I use any hollowtech bottom bracket cups or do I need specific 4600 series Tiagra ones (which are hard to find)? Frame needs BSA threaded cups...