How to Read Car Tire Sizes Correctly

 

How to Read Car Tire Sizes Correctly,

Car tires are one of the most important components that determine the comfort, safety, and performance of your vehicle. One of the most important information that every driver should know is how to read car tire sizes. This understanding will not only help you in choosing the right tires, but also ensure that the tires used are in accordance with the vehicle's specifications. This article will explain how to read car tire sizes, important symbols on tires, and tips for choosing the right tires for your vehicle.

Understanding Car Tire Sizes

The size of the car tire itself is usually listed on the outside of the tire in a certain format, such as 195/65 R15 91H. Each part of the code certainly has a specific meaning that describes the dimensions, construction type, and capabilities of the tire. Here are some detailed explanations :

1. Tire Width (195)

The first number in the code, 195, indicates the tire width in millimeters. This tire width is measured from the outside to the inside of the tire when installed on the rim.

• Example: If it says 195, it means the tire width is 195 mm. Wider tires provide better grip, but affect fuel efficiency.

2. Aspect Ratio (65) 

The number after the slash, which is 65, is the tire aspect ratio, which describes the comparison of the tire wall height and tire width. This number is expressed as a percentage.

• Example: If it says 65, it means the tire wall height is 65% of the tire width. Low aspect ratio tires (thin profile) are often used on sports cars to provide better stability, while high aspect ratios are suitable for comfort.

3. Construction Type (R) 

The letter R indicates that the tire uses radial construction, which is the most common type of construction on modern vehicles. Radial tires have plies of fiber arranged radially from the center of the tire, providing better comfort and durability.

• Alternatives: Other letters that may appear are B (bias-ply) or D (diagonal), although these are rare on passenger cars.

4. Rim Diameter (15) 

The next number, 15, indicates the rim diameter in inches. This number is important to ensure that the tire fits your vehicle's rim size.

• Example: If it says 15, it means the tire is designed to be used on a 15-inch diameter rim.

5. Load Index (91)

The number 91 is the tire load index, which indicates the tire's ability to support the maximum load. Each number in the load index has a certain value, and the load index table can be used to find out the load capacity in kilograms.

• Example: A load index of 91 means that the tire can support a load of up to 615 kg per tire.

6. Speed ​​Code (H)

The last letter, H, is the speed code that indicates the maximum speed limit that the tire can safely withstand.

• Example: The letter H indicates that the tire can be used up to a maximum speed of 210 km/h. The speed code table is available to see the speed limit that corresponds to the letter.

Additional Information on Car Tires

In addition to the size code, there is other information listed on the tire and it is important to understand :

1. Production Date

The tire production date is printed in a four-digit format, such as 1224. The first two numbers will indicate the week of production, and the last two numbers indicate the year of production.

• Example: 1224 means the tire was produced in the 12th week of 2024.

2. Treadwear, Traction, and Temperature Markings

• Treadwear: Describes the tire's resistance to wear. The higher the number, the more durable the tire.
• Traction: Indicates the tire's ability to handle wet conditions, usually given a grade of A, B, or C.
• Temperature: Indicates the tire's ability to handle heat, with a grade of A, B, or C.

3. M+S or 3PMSF Symbol

• M+S: Indicates the tire is designed for mud and snow conditions.
• 3PMSF (Three-Peak Mountain Snowflake): Indicates the tire has good performance on snowy roads.

4. Maximum Pressure and Load Limit

Tires list the maximum air pressure and maximum load they can support. This information is important to avoid excess pressure or load that damages the tire.

How to Choose the Right Tires

Choosing the right tires is one of the most important steps to maintain driving comfort and safety. Here are the right tips for choosing the right tires :

• Adjust to Manufacturer's Specifications: Use the tire size recommended by your vehicle's manufacturer. This information is usually found in the owner's manual or on a sticker on the driver's door.
• Pay attention to weather and road conditions: If you often drive in wet areas, choose tires with good grip on slippery conditions. For snowy areas, use tires specifically designed for winter.
• Pay attention to tire age and production date: Avoid buying tires that are more than three years old even if they look new. Tires that are too old can lose their elasticity, which affects their performance and safety.
• Adjust to Budget: Choose tires according to your budget and don't sacrifice quality for cheap prices. Poor quality tires increase the risk of accidents.