Understanding Truck Tire Codes: A Comprehensive Guide

Are you struggling to choose the right tires for your truck? Or simply curious about the “secret” numbers and letters on the tire sidewall? This guide will unravel the mystery and explain the importance of understanding truck tire codes.

One truck owner, Tuan from Ha Dong, shared his experience of choosing tires based on gut feeling or friends’ advice. This led to a dangerous skidding incident on a slippery road in Ba Vi due to improper tires. This experience highlighted the crucial role of understanding tire codes for safety and vehicle performance.

Decoding the Mystery: What are Tire Codes?

Tire codes are a set of letters and numbers imprinted on the tire sidewall, providing comprehensive information about the tire’s size, type, load capacity, pressure rating, and other essential characteristics.

A Detailed Breakdown of Tire Codes

Let’s analyze an example tire code: 195/65R15 91H

• 195: Tire width (in millimeters). In this example, it’s 195mm.
• 65: Aspect ratio (%). This number indicates the tire’s height is 65% of its width.
• R: Tire construction – Radial.
• 15: Rim diameter (in inches). This refers to a 15-inch wheel.
• 91: Load index – the maximum weight a tire can carry. Each index corresponds to a specific load capacity, which can be found in a load index chart.
• H: Speed rating – the maximum speed a tire is rated for. Similar to the load index, each letter represents a maximum speed, which can be found in a speed rating chart.

Truck tire sidewall with tire code

Benefits of Understanding Tire Codes

• Choosing the Right Tires: Ensures proper tire size, load capacity, and speed rating for your vehicle and its intended use.
• Enhanced Performance: Correct tires contribute to a smoother ride, improved fuel efficiency, and enhanced safety.
• Extended Tire Lifespan: Using the right tires and maintaining them properly can significantly prolong their lifespan, preventing premature wear and tear.