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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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@lazysuperhero
UPDATE! intrigued by @Skülly 's comment and @Chak 's texting I investrigated with a strong magnet
Turns out the frame is steel!
It's amazing, cos the main triangle sounds like alu when tapped, it's really thin and light. Obviously no idea what tubing it is. Open to any info from steel tubing anoraks here. But i can say that the whole thing -with seatpost, BB, forks (which are alu+ carbon) , headset- weighs at 2.8kg