Abstract: A derailleur, and more particularly, to a bicycle derailleur device that is compliant and self returning. There is a derailleur for moving a chain from one location to another while maintaining parallel alignment to a set of gears that mounted to a cycle. Specifically, the derailleur has a first and second rigid segments, parallel to each other, where the first segment means is fixed to the cycle and the second segment means is free to traverse from a first to a second position. In addition there is a first linking means, coupled between the first and second segments, for linking the first and second rigid segments together, and designed to move from the first position to the second position.