Dynamical ages of the opposite lobes determined {sl independently} of each other suggest that their ratios are between $sim$1.1 to $sim$1.4. Demanding similar values of the jet power and the radio core density for the same GRS, we look for a {sl self-consistent} solution for the opposite lobes, which results in different density profiles along them found by the fit. A comparison of the dynamical and spectral ages shows that their ratio is between $sim$1 and $sim$5, i.e. is similar to that found for smaller radio galaxies. Two causes of this effect are pointed out.
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