Circular velocity at half light radius (under assumption of flat σ profile, isotropy, and sphericity) for Local Group galaxies from Kirby et al. (2014) and the isolated dwarfs Cetus and Tucana, from Taibi et al. (2018) and this work. Circular velocity profiles for NFW halos between 8.5 ≤ log(M_vir/M_⊙)≤11 and following a mass concentration relation from Dutton & Macciò (2014) are shown color-coded by V_max. Local Group galaxies represented as gray filled circles. Cetus and Tucana are highlighted with a black triangle and square, respectively; they occupy locations comparable to other dwarfs of similar stellar mass (see also Fig. B.2).