v/v_ZAMS ratio of equatorial rotational velocities as a function of the t/t_MS time ratio in the MS for stars with masses from M = 1.5 to 3 M_⊙. v_ZAMS is the equatorial rotational velocity on the ZAMS, t is the stellar age and t_MS is the time that a star of given mass M can remain in the MS. Two extreme cases are represented: stars evolving as rigid rotators (instantaneous complete angular momentum redistribution) and as differential rotators without any angular momentum redistribution. Dashed lines represent the limits for J/M → 0, while the solid lines are for stars that on the ZAMS have a specific angular momentum that in the TAMS becomes the critical one.