Radial Plied and Diagonal Plied Tires

By | April 16, 2014

Radial plied and diagonal plied tires have better functionality. A series of cords are wound around the tire to improve the strength of the tire. The cord reinforces the tire which, otherwise would be too flexible and weak. This network of cords which gives the tire strength and shape is called a carcass. In the early days, these cords were wound across the tire in a +60 and -60 pattern in the direction of travel and so, they cris-cross each other.

But in a radial tire, the cord plies are laid at 90 degrees to the direction of travel. This avoids the plies rubbing against each other when the tire is rolling. This helps in achieving better fuel economy. To make the tire further stiff, additional steel belts surround the entire surface. The radial cords in the sidewall allow it to act like a spring, giving flexibility and ride comfort, while the rigid steel belts reinforce the tread region, giving high mileage and performance.


  • Good steering and improved road contact.
  • Since the side wall is flexible, there is increased comfort in driving.
  • Less heat is generated while driving at high speeds
  • Since the cords do not criss-cross over each other, there is less damage related to tread compared to other tire types.


  • The tire generates more noise due to its harder tread
  • Since the side walls are flexible and soft, they are not resistant when they hit curbstones.
  • Due to the presence of the steel belt, bumps in the roads make driving awkward.

Diagonal plied tires
Diagonal plies are arranged in such a way that they run at 45 degrees to the running direction. They can also known as bias ply tires. Diagonal plies have two important functions. They strengthen the sidewalls from cracking or swelling and stabilize the tread area on the road. These tires are made from various materials like cotton, artificial silk (rayon) or nylon.


  • Since it is less flexible and more sturdy, the stability of the vehicle is increased.
  • It has the capacity to clean itself well if it is exposed to muddy surfaces.
  • Unlike radial tires, the sidewall is highly resistant when hitting a curbstone.


  • Due to its high resistance to road and the rolling of the wheel, it gets heated up easily.
  • The tire is rigid and so offers less comfort.


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