If you haven’t come across this site before, Global Cycling Network is a goldmine of useful info and videos about virtually all things cycling. Following on from last weekend’s “glove hand brake” this video really caught my attention. How to get home if you puncture and don’t have patches, spare tubes or a $5 note. Love the last one.
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Carbon Addiction 
Have you seen their video on how much extra power is required to ride up hill with a little extra weight? It was a complete failure of physics and engineering.