A folding bicycle comprises a retractable front tube set. Handles at two sides
of the top of the front tube set can be folded to the same side. An eccentric rotation
device is pivotally provided at the top of the front tube set to drive an internal
tube to retract in an outer tube for positioning. A seat tube is pivotally connected
with the front tube set. A saddle is provided at the top of the seat tube. A rear
tube is pivotally connected with the seat tube. A fastening device is provided
between the rear tube and the seat tube to fix the seat tube. The front tube set,
the seat tube and the rear tube are connected together by a joint link, which provides
the function of a joint to let the front tube set, the seat tube and the rear tube
unfold or fold with one another.
