Ruota libera 1 velocità

    ***        *    *******     *      *****      *     
   *   *      **    *          **     *     *    **     
  *   * *    * *    *         * *     *         * *     
  *  *  *   *  *    ****        *     *           *     
  * *   *  *******  *           *     *           *     
   *   *       *    *           *     *     *     *     
    ***        *    *******  *******   *****   *******