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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.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Smallfurry
freezing77
This has been very reliable for me.
http://www.dx.com/p/ant-wireless-heart-rate-monitor-strap-for-smart-phones-computer-black-256722