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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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cornelius_blackfoot
Your left lever is 2009-2010 Ultra-Shift, while your right lever is 2011-2014 Power-Shift. Power-Shift was introduced in 2011 but only in the lower lines (Athena 11, Centaur 10, Veloce 10).