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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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@supernashwanpower
https://lh4.googleusercontent.com/-iAm6M7T94h8/Tdq5ESe0ntI/AAAAAAAAAfY/4MWKXqoqZUI/s912/DSC_2476.JPG
what is that black thing on the BB shell?