  In this article we derive the unitary transformation that relates the $q\bar
q$ chiral basis $\{R; I J^{PC} \}$ to the $\{I; ^{2S+1}L_J\}$-basis in a
front-form framework. From the most general expression for the Clebsch-Gordan
coefficients of the Poincar\'e group one can see that the chiral limit brings
the angular momentum coupling into a simple form that permits the relation in
terms of SU(2) Clebsch-Gordan coefficients. We demonstrate that such a
transformation is identical to the one was obtained for canonical spin in the
instant form.
