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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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@Velocio
SRM Power Meter Cranks:
They're using the track version: http://srm.customer.sasg.de/index.php?page=shop.product_details&flypage=flypage.tpl&product_id=24&category_id=13&option=com_virtuemart&Itemid=148
Not cheap though:
http://www.cyclepowermeters.com/srm-track-system-428-p.asp
£3,290