Question: what is the difference between radial and bias trailer tires?
Answer: Radial tires have plies that run perpendicularly across the tire and belts (often made of steel) running below the tread around the tire's circumference. Bias ply tires have their plies running at 30° angles (like the stripes on a candy cane). Most motorists believe radials are better (and they are for your auto).