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crossbreed - folding bicycle wheel
Vehicles with larger wheels have superior performance but cannot fold up smaller than the size of their wheels. Folding bikes with smaller wheels can fold up very well but are slower, less stable and less comfortable than a full size bike. The same problems apply to the design of practical wheelchairs.
(Patent pending - European patent no. 07252385.5)
source : http://www.foldsoc.co.uk/
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