4StrikeBike by TSG Essempio

A bicycle that can be pedalled with hands and feet at the same time has been developed by Dutch studio TSG Essempio.

4StrikeBike by TSG Essempio

Pedals replacing the handlebars allow the 4StrikeBike to be cycled with the hands and steered simultaneously.

4StrikeBike by TSG Essempio

These pedals click into a fixed upright position so the bike can also be used normally.

4StrikeBike by TSG Essempio

"The 4StrikeBike has adjustable pedalling handlebars and can be used as an ordinary city bike in traffic as well as a touring bike for longer distances at higher speeds," Jan Willem Zuyderduyn of TSG Essempio told Dezeen.

4StrikeBike by TSG Essempio

A chain runs up one side of the frame between the hand pedals and the standard mechanism linking the foot pedals to the back wheel.

4StrikeBike by TSG Essempio

The crankshaft has a special freewheel system that allows the bike to be cycled with both the upper and lower body, or just the legs while getting on and off.

4StrikeBike by TSG Essempio

Retired Dutch surgeon Lex van Stekelenburg came up with the idea for the bike after developing back problems, following years of performing lengthy operations while standing with a hunched posture.

4StrikeBike by TSG Essempio

Van Stekelenburg took the concept to TSG Essempio, who developed his proposal and prototypes further.

We've featured a number of unusual bicycles, including one made from see-through plastic and another constructed out of cardboardSee more cycling design »