Bicycling Science is the business; not sure if it's what you're really looking for, but it's bicycles and physics and engineering in one book. Actually it is what you're after - I'd recommend reading it if that's your area of interest.
@Richard_Cheese 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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Bicycling Science is the business; not sure if it's what you're really looking for, but it's bicycles and physics and engineering in one book. Actually it is what you're after - I'd recommend reading it if that's your area of interest.