Can I Use a Tyre With a Lower Load Rating?

When it comes to choosing the right tyres for your vehicle, there are many factors to consider, and one of the most critical is the tyre’s load rating. 

This rating determines how much weight your tyres can safely support, and using the wrong one can affect your vehicle’s safety and performance. But what happens if you use a tyre with a lower load rating than what’s recommended for your vehicle? Is it safe, or are you risking serious damage and safety hazards? 

In this article, we’ll explore the role of tyre load ratings, why they matter, and the potential risks involved in choosing a tyre with a lower load capacity than required. By the end, you’ll have a clear understanding of how to keep your vehicle safe and performing optimally when it comes to tyre selection.

What is Tyre Load Rating?

Tyre load rating is a numerical code found on the sidewall of your tyre, indicating the maximum weight that each tyre can safely carry at its recommended pressure. This rating is critical because it ensures that your tyres are capable of supporting the weight of your vehicle, including passengers, cargo, and other loads. 

The load rating is part of a broader tyre marking system, often located near the tyre size and speed rating, and it’s essential for maintaining both safety and performance. Using tyres with an appropriate load rating is crucial to avoid excessive wear, reduce the risk of tyre failure, and maintain overall vehicle stability, especially during braking and cornering.

Why is Load Rating Important?

The load rating of your tyres is vital for maintaining the safety and functionality of your vehicle. Tyres with a lower load rating than what your vehicle requires may not be able to handle the weight, leading to excessive wear, reduced handling, and an increased risk of tyre failure. When tyres are overloaded, they can overheat, which may result in blowouts or a sudden loss of control, especially at higher speeds. 

Additionally, using the correct load rating ensures optimal performance, fuel efficiency, and stability, helping to extend the lifespan of your tyres and keeping your vehicle safe on the road. In short, the load rating directly impacts your vehicle’s reliability and your safety as a driver.

Where Can I See My Rating?

You can find your tyre’s load rating printed on the sidewall of the tyre itself. It’s typically located next to other important information, such as the tyre size and speed rating. The load rating is represented by a two- or three-digit number, which corresponds to the maximum weight each tyre can safely carry at the specified tyre pressure. 

For example, a load rating of “91” indicates that the tyre can carry up to 615 kg. In addition to the tyre, you can also check your vehicle’s manual or the placard inside the driver’s side door, where the manufacturer’s recommended tyre specifications, including the load rating, are listed. Always refer to these resources to ensure you’re using tyres that meet your vehicle’s requirements.

Does Tyre Pressure Change With Load?

Yes, tyre pressure can change depending on the load your vehicle is carrying. As the load on your vehicle increases—whether due to passengers, cargo, or towing—the tyres experience greater stress, and proper tyre pressure becomes even more important. Under-inflated tyres can lead to overheating and uneven wear, while over-inflated tyres may reduce grip and ride comfort. 

It’s essential to maintain the correct tyre pressure as specified by your vehicle manufacturer, which can be found in the vehicle’s manual or on the placard inside the driver’s door. Some vehicles may also recommend adjusting tyre pressure slightly when carrying heavier loads to ensure optimal performance and safety. 

Regularly checking and maintaining proper tyre pressure is crucial for supporting the load, extending tyre life, and ensuring a smooth and safe driving experience.

Load Capacity Index of Vehicle Tyres

The load capacity index of a tyre is a critical measurement that indicates how much weight a tyre can support. Each index value corresponds to a specific maximum load in kilograms. 

For example, a tyre with a load index of 75 can carry up to 387 kg, while a tyre with an index of 120 can handle up to 1,400 kg. It’s essential to match the load index of your tyres with your vehicle’s requirements to ensure safety and optimal performance. 

Below is a quick reference table showing some common load index values and their corresponding load capacities:

Load Index	Load Capacity (kg)
75	387
80	450
85	515
90	600
95	690
100	800
105	925
110	1060
115	1215
120	1400

Choosing the correct tyre load rating is essential for ensuring the safety, performance, and longevity of your vehicle. While it may be tempting to opt for tyres with a lower load rating, doing so can lead to serious risks, including tyre failure, compromised handling, and even dangerous blowouts, particularly under heavy loads. 

The load rating reflects the tyre’s ability to support the weight of your vehicle and its cargo, making it crucial to select tyres that meet or exceed the manufacturer’s specifications.

By understanding what the tyre load rating means, why it’s important, and where to find this information on your tyres and vehicle, you’ll be better equipped to make informed decisions about your tyre purchases. 

Whether it’s ensuring your tyres are properly inflated or selecting the right load capacity index, following these guidelines will help maintain your vehicle’s safety, optimise its performance, and provide peace of mind on the road. 

Always prioritise the correct load rating to keep your driving experience smooth, safe, and efficient.