I was in Cpoenhagen recently, and there were heaps of bikes with these on:
http://www.reelight.com/
They look like a nice option for a utility bike. Alson continue running when stopped.
@Joe.S started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
I was in Cpoenhagen recently, and there were heaps of bikes with these on:
http://www.reelight.com/
They look like a nice option for a utility bike. Alson continue running when stopped.