Are bias ply tires better for trailers?
Diagonal bias, or bias-ply tires, use layers of nylon textile cords crisscrossing at 30° angles. They are better for trailers navigating short distances or off-pavement situations. Diagonal bias tires have a shorter tread life than radial tires and are indicated by the letter D in the tire code. It is not recommended to mix and match trailer tires types.