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Dynamical ages of the opposite lobes determined {\sl independently} of eachother suggest that their ratios are between $\sim$1.1 to $\sim$1.4. Demandingsimilar values of the jet power and the radio core density for the same GRS, welook for a {\sl self-consistent} solution for the opposite lobes, which resultsin different density profiles along them found by the fit. A comparison of thedynamical 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 causesof this effect are pointed out.

Dynamical Age vs Spectral Age of the Lobes of Selected Giant Radio Sources (GRSs)