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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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Hi,
I need to buy a 1 1/8 headset IS41 28.6 IS41 30.
I know that IS41 is for the integrated headset, but I don't know the other numbers where they come from and if you could help me with an advice or where do I have to measure the frame to get to those numbers...
Thank you.