A gearbox of several gears for bicycles or the like comprising a hub axle, an impeller supported rotatably on the hub axis, a hub sleeve supported on one side on the impeller and, on the other hand, on the sleeve of the hub, a planetary gear housed inside the hub sleeve, connected by drive connection to the impeller and provided with a central wheel, a satellite carrier, satellites arranged on the satellite holder and a hollow wheel, also comprising a first coupling of free running between the satellite holder and the tube sleeve, a second free-running coupling realized in the form of a ratchet mechanism with ratchet triggers and a toothing for a ratchet trigger, which is arranged between the hollow wheel and the sleeve of the ratchet. Bucket, and a disengagement device for the ratchet mechanism, provided with a control ring acting on the ratchet triggers of the ratchet mechanism and which, in a in this case, the control position relative to the ratchet pawls makes them engage with the toothing for the pawls of the pawl, while in a second position of control relative to the pawls of the pawl, it keeps them out of the toothing for the triggers of the pawl. Ratchet, being in both positions of ciando dragged by the ratchet triggers when moving these forwards, and watertight loaded by a device of brake of recoil, in such a way that, when turning backwards the ratchet triggers, happens of one of the control positions with respect to the ratchet triggers, to the other control position, characterized in that the control ring has a support sleeve for its support to rotate on a part of the hub, and a control envelope provided with a profile of control on its inner surface, surrounding that surrounds from the outside the ratchet triggers. (Machine-translation by Google Translate, not legally binding)
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