https://youtu.be/BnnxqQj_dDs
That's an explosive fan blade removal test, you can tell because they one that's being removed by explosives is painted orange so they can track it.
@Sumo started
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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https://youtu.be/BnnxqQj_dDs