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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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@Ian1050
If you want to find out about bicycle design and science try to get copies of books
Bicycles & Tricycles (An elemental treatise on their design and construction) by Archibald Sharpe
also
Bicycling Science by Frank Rowland Whitt and David Gordon Wilson
Both Published by MIT press
Happy reading