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Riding a bike is all about the balance. Many people missed the leaning of riding a bike in the
childhood, and feel difficult to handle a bike in a short time when they grow up. The concept is to
add another back wheel so the bicycle will be balanced itself. It also can make through wheels
respectively before and after reverse backward and forward the front wheels into the two wheels
in the middle, the user can experience the bicycle portable of another kind of fun.
Dalian Polytechnic University