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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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@HatBeard
http://www.electricblues.com/html/runpro.html
download the excel spreadsheetat the top, plug in your details and there's a section on there that shows the potential gains in performance based on things like changing weight.
all based on the formulas in Daniels Running Formula book.
Dammit may have a stat gasm when he sees this.