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 4StrikeBike by TSG Essempio](https://static.dezeen.com/uploads/2013/04/dezeen_4StrikeBike-by-TSG-Essempio_3.jpg)
Pedals replacing the handlebars allow the 4StrikeBike to be cycled with the hands and steered simultaneously.
![4StrikeBike by TSG Essempio 4StrikeBike by TSG Essempio](https://static.dezeen.com/uploads/2013/04/dezeen_4StrikeBike-by-TSG-Essempio_6.jpg)
These pedals click into a fixed upright position so the bike can also be used normally.
![4StrikeBike by TSG Essempio 4StrikeBike by TSG Essempio](https://static.dezeen.com/uploads/2013/04/dezeen_4StrikeBike-by-TSG-Essempio_7.jpg)
"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 4StrikeBike by TSG Essempio](https://static.dezeen.com/uploads/2013/04/dezeen_4StrikeBike-by-TSG-Essempio_5.jpg)
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 4StrikeBike by TSG Essempio](https://static.dezeen.com/uploads/2013/04/dezeen_4StrikeBike-by-TSG-Essempio_8.jpg)
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 4StrikeBike by TSG Essempio](https://static.dezeen.com/uploads/2013/04/dezeen_4StrikeBike-by-TSG-Essempio_4.jpg)
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 4StrikeBike by TSG Essempio](https://static.dezeen.com/uploads/2013/04/dezeen_4StrikeBike-by-TSG-Essempio_2.jpg)
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 cardboard. See more cycling design »