What is the biggest tire size for a 2002 ford explore stock rims ?

Its a 2002 ford explorer xlt model . The original size is P235 / 70 / R 16 and yes thats on the side panel for the stock rims that came with it . I just want to know whats the biggest tire that could fit on it ..What is the biggest tire size for a 2002 ford explore stock rims ?255-70-16