Complete Guide on 10 Essential Parts of a Tire: Names, Functions & Diagram

Overview of Parts of a Tire

The tire is a ring-shaped component that surrounds a wheel’s rim to transfer a vehicle’s load from the axle through the wheel to the ground and to provide traction on the surface over which the wheel travels. It is a crucial component of a vehicle as it provides the only point of contact with the road. It guarantees traction and permits movements like steering, braking, acceleration, and turning to be transmitted. For safe driving, selecting the correct tire is crucial, and being aware of each component can help you make an informed decision. The size of tires varies depending on the type of vehicle, yet all automobiles have comparable tire parts. Utilize our tutorial to fully understand the parts of a tire to increase your driving safety.

Parts of a Car Tire Diagram

Parts of Tire, Names & 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 Tire


The beads play a crucial role in securing the tire to the rim of a vehicle. Positioned beneath the sidewalls on both sides of the tire, these elements consist of high-tensile steel wires coated with copper, bronze, or brass, wound around rubber bands. The primary function of the beads is to mitigate tire slippage during vehicular motion, enhancing overall stability and safety.

Beads Filler

Bead filler, a crucial component in a tire’s construction, is a rubber compound strategically positioned in the bead region. Its primary function involves enhancing stability in the tire’s sidewall and bead areas.

The density and stiffness characteristics of the bead filler significantly influence the tire’s overall performance and longevity. These attributes play a pivotal role in fortifying the tire’s structural integrity, thereby mitigating the risk of damage over extended periods of use.

The discernment of a tire’s performance hinges upon a nuanced understanding of the intricate interplay between its bead filler properties and overall resilience.

Radial Cord Body

The radial cord body, also called body plies, comprises multiple layers of plies, enhancing overall assembly strength. This reinforcement significantly improves resistance against road damage.

Materials used in radial cord bodies include polyester, rayon, and nylon. These diverse fibers contribute to the robustness of the structure, collectively fortifying the tire construction.

Inner Liner

A tire’s inner liner constitutes the internal segment responsible for maintaining optimal air pressure by serving as an impermeable barrier.

Essentially functioning as the tire’s inner tube equivalent, it prevents air leakage, ensuring sustained pressure integrity. This critical component is pivotal in preserving tire functionality and safety by effectively containing the compressed air within the tire structure.

Belt Plies

Belt plies, comprising multiple layers of steel cord situated just beneath the tread region, enhance tire performance. Functionally, they impart robustness, stability, and flexibility to the tire while concurrently endowing it with resistance.

These strategically positioned steel cord layers contribute to overall tire strength and play a pivotal role in augmenting traction and grip. This sophisticated integration of belt plies elevates tire functionality, aligning it with heightened standards of durability and traction in diverse road conditions.


The side of the tire is called the sidewall. It is the area between the beads of the tire and the tread. The sidewall shields the inner part of the tire from damage, cuts, and scratches. The terminology 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 tire width.

3. Construction: Construction means how the tire is built. Following is the typical 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. It’s generally measured in inches.

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

6. Speed Rating: The speed rating has a different letter, which shows the maximum speed the tire can run.

7. DOT: DOT is abbreviated as the 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. If 1220 is written on the tire, then it can be read as the 12th week & year 2020.

Tire Sipe

These distinctive tire treads provide adequate traction across diverse weather conditions. Tiny diagonal grooves within the sipe enhance grip, ensuring optimal tire performance. This innovative design caters to varied climates, delivering heightened traction for an unparalleled driving experience.


The tire tread, situated at the outermost periphery of the tire, constitutes the tangible interface between the tire and the road surface.

This region is composed of rubber and has a distinctive and intricate design encompassing a specific pattern. This bespoke design enhances the tire’s grip and traction on the road, mitigating the risk of skidding or slipping.

The configuration and pattern of the tread exhibit a high degree of variability, predominantly contingent on prevailing weather and road conditions. Furthermore, these features show considerable diversity across different tire manufacturers.

The deliberate selection of these design elements is pivotal in optimizing performance and safety characteristics tailored to specific driving conditions.

Tire grooves

A tire groove is a region between two contiguous tread ribs on a tire. These grooves serve the crucial function of facilitating rapid water evacuation, thereby enhancing wet traction. Additionally, they contribute to optimal road grip.

Tire Shoulder

The tire shoulder represents the outermost perimeter of the tread, encompassing the initial section of the sidewall. Its primary function is to furnish enhanced reinforcement and safeguarding to the tire’s sidewall. This pivotal aspect contributes substantial support, thereby fortifying the overall structural integrity of the tire.

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