How are these: http://robdeanhove.blogspot.co.uk/2012/07/racing-on-dynamo-charging-my-gps-bright.html
@amey 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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How are these: http://robdeanhove.blogspot.co.uk/2012/07/racing-on-dynamo-charging-my-gps-bright.html