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We put forward a new phenomenological method for calculating the slope ofradial trajectories from values of ground states and vacuum condensates. Themethod is based on a large-$N_c$ extension of borelized spectral sum rules. Theapproach is applied to the light non-strange vector, axial, and scalar mesons.The extracted values of slopes proved to be approximately universal and are inthe interval $1.4\pm0.1$ GeV$^2$. As a by-product, the given method leads toprediction of the second radial trajectory with ground state mass lying near0.6 GeV.

The large-Nc limit of borelized spectral sum rules and the slope of radial Regge trajectories