The Definition of a Tyre

Categories: CarVehicles

What is a Tyre?

•Pneumatic tyre is a flexible, toroidal, compressed gas (normally air) container mechanically attached to the outer circumference of rim of a vehicle wheel. The name is derived from “Attire” – a protecting covering or coat. •The rubber exterior of a pneumatic tyre is merely a flesh for a skeleton of fabric; this skeleton and the manner in which it is constructed are of fundamental importance in establishing the tyre’s characteristics. •A tyre is an integral component of a vehicle and is the intermediary between the vehicle and the road.

Why do I need Tyre?

•Supporting the vehicle weight including payload (load carrying capacity) •Transferring Traction and Braking forces to the road surface (Traction, Torque and braking) •Absorbing Rod shocks (Cushioning and Enveloping)

•Changing and maintaining Direction of travel (Steering response and stability during cornering)
•Low Rolling Resistance
•Minimum Noise / Road Vibration
•High Speed safe operation Capability
•Aesthetics & Comfort



You might be having having a hard time getting the right tire size.

The car tire sellers needs to determine what best fits to your vehicle that’s why you need to understand the letters, numbers, slash letters and letter combination of your tires.

Here’s How:

1. Know what the first letter stands for your vehicle type to which the tire is to be installed. Example: P for passengers, T for Temporary Spare, LT for Light Truck, ST for Special Trailer. I’m sure that is not hard to decipher in your tire size chart.

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2. Width Number. The width is indicated after the digits or it’s cross section measurement usually in millimeters. Example: If you have a tire that says P225, therefore it means that the tire is for a Passenger Vehicle and the tire cross section width is 225 millimeters.

3. You need to understand the aspect ratio concept. It normally follows with a slash after the width of the chart. Example: P225/60 – that simply means that tire’s aspect ratio is 60. It represents the percentage of width and height. Thus, the height of this car is 60% of it’s width.

4. Get yourself intimate with the construction of the tire. Normally, the letter that follows the aspect ratio indicates the car tire’s internal construction. A commonly used type of car is Radical which symbolizes in R.

5. Rim Size. It is the number that follows the tire’s construction. Example: P225/60 R15, here the rim size is 15 inches. Since you now deciphered your tire size lingo then you can now go ahead and change your worn-out tires. P225/60 R15 means: Passenger Vehicle Tire, a 225 millimeters cross section width, 60% aspect ratio, radical and a rim size of 15 inches.

If for instance your car size is not listed, the measure the tire as shown then afterwards compare those measurements as against the ones in the chart.

Cite this page

The Definition of a Tyre. (2016, Dec 18). Retrieved from

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