Tyre Basics

Tyre Construction

– Bias Ply Tyres

  • The plies run at an angle from bead to bead.
  • One of the oldest design.
  • Does not use any belts
  • Allows body of the tire to flex easily.
  • Improved cushioning, hence smooth ride on rough roads.

Tyre Construction

– Bias Belted Tyres

  • Bias ply tires with belts added to increase tread stiffness.
  • Belts and plies run at different angles.
  • Belts do not run around the sidewalls, they lay under the tread area only.
  • Provides smooth ride and good traction.

Tyre Construction

– Radial Ply Tyres

  • Plies running straight across from bead to bead, with stabilizer belts directly beneath the tread.
  • The direction of steel cords in sidewall are in radial direction hence the design is termed as radial technology.
  • Has a very flexible sidewall and a stiff tread, giving it a very stable footprint.

Comparison of

Radial with Bias/Nylon Tyre

Difference Between

Radial with Bias/Nylon Tyre

Sidewall and tread flex together

One complete movement (Dependent)


Tread stable in spite of movement in the sidewall

Two separate movements (independent)

Contact Comparison
Advantages of Radial Tyres
Cooler Running

Steel Cords do not scrub or rub as the casing is made of single ply (Less internal friction)

Smooth Riding Comfort

As tread and sidewall flex independently, most of the socks are absorbed by sidewall only and gives smoother ride.

Excellent Traction & Braking

Flat Stable crown, Larger foot print area

Better Grip

Full width of tread is held on the road when the vehicle is cornering

Even Wear & Higher Tread Life

Stiffer Tread gives larger foot print which ensures even wear and better mileage.

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