Average surface rotational velocities, v_rot, as a function of luminosity during crossings of the IS for 3, 5, and 8 M_⊙ models of different metallicities, Z = 0.014 (top), Z = 0.006 (middle), and Z = 0.002 (bottom). Solid, dashed, and dotted lines correspond to models without MS core overshooting, and with f_H = 0.01, and f_H = 0.02, respectively. In all models, the initial ZAMS rotation rate is W₀ = 0.3.