New systems of speed changes applicable to bicycles of all kinds which is characterized by comprising a lever that pushes by the simple acceleration of the bolt being the path exactly the distance that separates the plates which makes the chain change from one to another dish without danger of getting out of these whose lever is provided with a clamp-support. Washer-retainer and another one of steel pumped that allows to fix said lever at will being completely fixed without danger of any movement. (Machine-translation by Google Translate, not legally binding)
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