Decoding Tire Codes: A Comprehensive Guide

Tires are the only part of your vehicle that directly contacts the road surface, ensuring safety and smooth operation for every journey. Understanding tire markings is crucial for choosing the right tires for your vehicle and driving needs.

What Are Tire Markings?

Tire markings are a combination of letters and numbers imprinted on the tire sidewall, providing detailed information about the tire’s size, type, load capacity, maximum speed, manufacturer, and other technical specifications.

Diagram showing tire code and markings on a tire sidewall

Tire Marking Systems

There are two common tire marking systems: metric and inch. The metric system uses millimeters (mm) for tire dimensions, while the inch system uses inches.

1. Metric System

Example: 195/55R16 87V

• 195: Tire section width (mm)
• 55: Aspect ratio (sidewall height as a percentage of section width), here it is 55% of 195mm
• R: Radial tire construction
• 16: Rim diameter (inches)
• 87: Load index (refer to the load index chart)
• V: Speed ​​symbol (refer to the speed ​​symbol chart)

2. Inch System

Example: 31×10.50R15LT

• 31: Tire diameter (inches)
• 10.50: Tire section width (inches)
• R: Radial tire construction
• 15: Rim diameter (inches)
• LT: Tire type (Light Truck)

Other Markings on Tires

In addition to the basic specifications, there are many other markings on the tire sidewall:

• Manufacturer’s name: Michelin, Bridgestone, Goodyear,…
• DOT code: Identifies the manufacturing plant, week of manufacture, and tire identification number
• TWI: Tread Wear Indicator location
• Max Load: Maximum load capacity the tire can bear
• Max Pressure: Maximum permissible inflation pressure

Why is Understanding Tire Markings Important?

• Choosing the right tires: Ensuring the size, load capacity, and speed rating are suitable for your vehicle and driving needs.
• Driving safety: Appropriate tires help the vehicle operate stably and safely, especially in adverse weather conditions.
• Fuel efficiency: Correct tires reduce rolling resistance, improving fuel economy.
• Extending tire lifespan: Using the right type of tire helps it last longer and prevents premature damage.

Conclusion

Understanding tire markings is essential knowledge for every vehicle owner. Carefully check the information on the tire sidewall or consult with experts to choose the most suitable tires, ensuring safety and optimal performance for your vehicle.

Frequently Asked Questions

1. Can I change the tire size for my vehicle?

You can change the tire size within a certain range, but you need to follow the manufacturer’s recommendations to ensure safety and vehicle performance.

2. How long is the lifespan of a tire?

Tire lifespan depends on many factors such as road conditions, driving habits, maintenance, etc. On average, tires should be replaced after 5-6 years of use or when the tread wear reaches the permissible limit.

3. Which tire brand is the best to choose?

There are many reputable tire brands on the market such as Michelin, Bridgestone, Goodyear,… Each brand has its own advantages and disadvantages, you should choose the type of tire that suits your needs and driving conditions.

4. What is the sufficient tire pressure for a car?

The standard tire pressure is indicated on the sticker on the vehicle’s door frame or in the owner’s manual.

5. When should I rotate car tires?

Tires should be rotated regularly every 10,000km or 6 months of use to ensure even wear between tires, extending tire life.

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