various parts of tire

Overview of Parts of Tire

The tire is one of the main components in the car because this is the only point of contact with the road. It gives traction on the road to run the vehicle. Transferring action such as steering movement, braking, acceleration, and turning depends on the tire only. So, it is very important to choose the proper tire. When selecting a tire for the vehicle, it is necessary to have information about parts of the tire. Selection of the tire parts is also important during their manufacturing. There are variations in the size as per the type of the vehicle. But all car tire parts are the same.

Car Tire Parts Diagram

Car Tire Parts Names

  • Beads
  • Beads Filler
  • Radial Cord Body
  • Inner Liner
  • Belt Plies
  • Sidewall
  • Tread
  • Tire Sipe
  • Tire Grooves
  • Tire Shoulder

Parts of a Car Tire


Beads are used to hold the tire with the rim of the vehicle. It is beneath the sidewall of two sides of the tire.

Beads are made up of high tensile steel wires with plating of copper, bronze, or brass, which wounds on rubber bands. The purpose of the bead is to prevent the sliding of the tire when the vehicle is in running condition.

Beads Filler

Bead filler is a rubber compound that presents inside the tire’s beads. It provides stability to the sidewall and bead area.

The density and stiffness of a tire’s bead filler are helpful, which gives more idea to determine a tire’s performance that is very helpful for the long life of the tire without any damage.

Radial Cord Body

The radial cord body is also called body plies. This radial cord body is made up of several layers of plies, which gives more strength to the whole assembly.

This result will give more resistance to road damage. Polyester, rayon, and nylon are common materials used in radial cord bodies.

Inner Liner

The inner liner is the inside portion of the tire that is used to retain the air pressure. It prevents air from leaking; it acts as a tube of a tire. 

Belt Plies

Belts plies are the more than two layers of cord that are made up of steel exactly below the tread area. Its function is to give strength, stability, and flexibility also resistance to the tire. These belt plies are also giving more traction and grip to the tire.


The side of the tire is called the sidewall. It is the area between beads of the tire to the tread. The sidewall is used to protect the inner part of the tire from damage, cuts, and scratches. The nomenclature is written on the sidewall of the tire. 

Parts of the tire with nomenclature and picture.

parts of tire with nomenclature

1. Tire Width: Tire width is the distance between two sidewalls of the tire. It’s generally measured in mm.

2. Aspect Ratio: The aspect ratio is nothing but a comparison of the height of the tire with the width of the tire. If the aspect ratio is 35 then the height of the tire is 35% of the width of the tire.

3. Construction: Construction means how the tire is built. Following are the common construction notation.

R = Radial Construction
B = Bias Ply Construction
D = Diagonal Construction

4. Rim Diameter: Rim diameter is nothing but the actual diameter of the wheel when the tire is placed on it. Its generally measured in inches.

5. Load Index: Load index is the actual load on the tire or how much load the tire can sustain. More load index sometimes results in tire burst.

6. Speed Rating: Speed rating has different later, which shows the maximum speed of tire can run.

7. DOT: DOT is abbreviated as Department of transport. It is very useful to denote when the tire is manufactured.

8. Week: It denoted the in which week the tire is manufactured.

9. Year: The year represents the manufacturing date when the tire is being manufactured. Eg. 1220 is written on the tire then it can be read as the 12th week & year 2020.

Tire Sipe

These are special treads used to give better traction to the tire in uneven climatic conditions. This sipe has small and diagonal grooves, which help to get a better grip on the tire.


Tread is the outermost area of the tire. It is an actual area of the tire that comes in contact with the road. The tread of the tire is made up of rubber, and it has a special design and pattern.

This special design and pattern are used to get a better grip and traction of the tire with the load. So, it prevents the skidding and slipping of the tire.

The design and pattern of tread are mainly depending upon weather conditions and road conditions. It also differs from manufacturer to manufacturer.

Tire grooves

It is an areas between two adjacent tread ribs called tire grooves. The purpose of tire grooves is to allow water to remove very fastly. It also helps to provide a good grip on the road. 

Tire Shoulder

The tire shoulder is the outermost edge of the tread that includes the start of the sidewall. This tire shoulder gives more support and protection to the sidewall of the tire.

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