  Using the isospin-dependent quantum molecular dynamics model we study the
isospin effects on the disappearance of flow for the reactions of $^{58}Ni$ +
$^{58}Ni$ and $^{58}Fe$ +$^{58}Fe$ as a function of impact parameter. We found
good agreement between our calculations and experimentally measured energy of
vanishing flow at all colliding geometries. Our calculations reproduce the
experimental data within 5%(10%) at central (peripheral) geometries.
