Ruota libera 6 velocità Shimano

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