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old bikes
How to take a berm...
This photo circa 1930s allegedly... brilliant!
From:
http://bikehugger.com/2008/08/pisteando_1930.htm
http://www.flickr.com/photos/sewincicle/2748419271/
Building better wheelchairs from Mountain Bikes for the Third World.
Off road designs show the way....and make life in a chair more fun no doubt!