A detailed comparison is made between the tearing-type modes observed in TFTR supershot plasmas and the nonlinear, neoclassical pressure-gradient--driven tearing mode theory. Good agreement is found on the nonlinear evolution of single helicity magnetic islands ({ital m}/{ital n}=3/2, 4/3, or 5/4, where {ital m} and {ital n} are the poloidal and toroidal mode numbers, respectively). The saturation of these neoclassical tearing-type modes requires {Delta}{prime}{lt}0 (where {Delta}{prime} is the well-known parameter for classical current-driven tearing instability), which is also consistent with the numerical calculation using the experimental data.