Bias ply tires are constructed with two or more layers of nylon cords wrapped at 30-38 degree angles from bead to bead to produce the support and carcass (the network of chords that gives the tire is strength) . Layers must be an even number to maintain stability.

Steel belted bias uses two or more layers of nylon cord PLUS two steel belt layers beneath the tread. This construction creates a reinforced carcass (the network of chords that gives the tire is strength) that offers additional support and a more rigid inner material to bond with the tread.

Radial tires are constructed with steel belts running at 90 degree angle of the tread center line.  This gives the tire it's reinforcement to be able to withstand the internal air pressure and external weight of the vehicle. This results in a smoother ride that helps prevent heat build-up, which can make the tires last longer. Radial tires have more flex therefore allowing more ground contact. The end result is better traction and tread wear.