Radial Tire - Construction

Construction

With only radial cords, a radial tire would not be sufficiently rigid at the contact with the ground. To add further stiffness, the entire tire is surrounded by additional belts that are oriented closer to the direction of travel, but usually at some "spiral" angle. These belts can be made of steel (hence the term steel-belted radial), Polyester, or Aramid fibers such as Twaron and Kevlar.

In this way, low radial tires separate the tire carcass into two separate systems:

• The radial cords in the sidewall allow it to act like a spring, giving flexibility and ride comfort.
• The rigid steel belts reinforce the tread region, giving high mileage and performance.

Each system can then be individually optimized for best performance.