A type of tire construction in which the tire cords or plies run diagonally from bead to bead. Generally in passenger cars, there are two plies of fabric. In a P185/80D13 tire, the D indicates a bias-ply tire. Sometimes called a "conventional" tire.
BIAS TIRE
Meaning of BIAS TIRE in English
English dictionary of automotive terms. Английский словарь автомобильных терминов. 2012