BIAS BELTED DESIGN

The reason bias tyres do not damage as easily as full radials is because:

• Each body plies layer runs in a different direction (75°) from the first, making them stronger. Because of opposing angles when one layer is damaged, it confines the damage to the one layer.
• The blue belts are two radial belts added to give the tyre stability on the road and are sandwiched between the body plies to reduce the possibility of separation. The radial belts are fibreglass so they don't rust, and more flexible to give a softer ride.
• They have four to six actual body plies or layers.

RADIAL DESIGN

The reason radial tyres damage easily is the design.

• The two blue belts are two radial steel belts that sit on top of the body plies. They are susceptible to rust and flying off when damaged.
• All the body plies, either two or three layers run in the same direction from bead to bead. This makes them flexible and susceptible to damage and even when one layer is cut the damage grows as it runs in line with the cord direction.