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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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@hippy
See..
http://www.bikebiz.com/news/21937/Mask-maker-slams-Sunday-Times-coverage-of-cycling-is-bad-for-the-heart-story
and..
Smog/Pollution Mask Revisited... - RoadBikeReview Forums
and..
Cycling Masks - Good/Bad