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Micromagnetic modeling was used to investigate transverse domain wall propagation through Permalloy nanowires of width, w, between 10 and 120 nm and thickness, T, between 2 and 20 nm. The transverse wall mobility below Walker breakdown, ??, and Walker breakdown field, H w, depended on the exact wire dimensions, rather than simply a function of w/T, as suggested by 1-D analytical modeling. Empirical equations describing the w and T dependence of ?? and H w were found from the micromagnetic data. As the model makes no assumptions about magnetization uniformity, these equations provide a generic description of ?? and H w for transverse domain walls in Ni80Fe20 nanowires.