What is a Tyre Load Index?

If you’ve ever looked closely at the sidewall of your car’s tyres, you’ve probably seen a mix of numbers and letters that seem random at first glance. But tucked within that string of characters is something incredibly important – the tyre load index.

This number tells you how much weight your tyre can carry safely when properly inflated. It’s one of those things you might not pay much attention to—until something goes wrong. Whether you’re commuting daily, heading off on a long road trip, or hauling heavy tools for work, having tyres with the correct load index is essential. It’s not just about performance—it’s about safety, legal compliance and protecting your investment.

If your tyres aren’t up to the job, you could be putting yourself, your passengers, and your vehicle at risk. In some cases, using the wrong load rating can even void your insurance if it leads to an accident. But the good news is this: once you understand what the tyre load index means, it’s easy to check. And once you know how to find it, you’ll always know you’re driving on the right setup.

Where can I see my tyre load index

You’ll find the tyre load index stamped right onto the sidewall of your tyre. It’s part of the larger alphanumeric code that tells you everything from the width and profile of your tyre to the maximum speed it can handle.

The load index is a two- or sometimes three-digit number that comes just before the speed rating letter. For example, if your tyre reads 205/55 R16 91V, then that 91 is your load index. It tells you how many kilograms that tyre can carry when it’s fully inflated to the manufacturer’s recommended pressure.

It’s worth mentioning that you can also find the recommended tyre specifications—including the load index—inside your car’s handbook or on a sticker, usually located on the driver’s door sill or inside the fuel flap. Always match any replacement tyres to these values, or speak to a specialist if you’re unsure.

Tyre Load Index Chart

Here’s a quick guide to help you decode the numbers. Each load index corresponds to a specific weight in kilograms. Remember, this figure applies to one tyre—so multiply it by four to get the full load your car can carry (even though in real-world conditions, not all four tyres share the load equally).

This is just a snippet of the full index scale—it actually ranges from 60 (250kg) all the way up to over 120 (more than 1,400kg). But most passenger cars, vans, and 4x4s will sit somewhere between 80 and 110.

Why is the load index important

It’s easy to underestimate the role your tyres play in keeping you safe—but the load index is a critical piece of the puzzle. If your tyres aren’t rated for the weight of your vehicle and whatever else you’re carrying—passengers, luggage, tools, or equipment—you’re putting yourself at serious risk.

Tyres that are overloaded can overheat quickly, especially at motorway speeds. That heat builds up inside the sidewalls and eventually leads to structural failure—usually in the form of a sudden blowout. If you’ve ever experienced or seen that on the road, you’ll know just how dangerous it can be.

Even if things don’t go as far as a blowout, overloaded tyres wear out faster, lose grip more easily, and affect braking distances—especially in wet or cold conditions.

There’s also a legal side to consider. If you fit tyres with a lower load rating than your car needs, and you’re involved in an accident, your insurance company might not cover the damage. Worse still, you could be fined if your car’s found to be unsafe or unroadworthy because of mismatched tyres.

So, while it might be tempting to go for a budget tyre that seems like a great deal, always double-check that it meets or exceeds your car’s required load index. The few pounds saved upfront could cost you dearly later on.

What does load index 91 mean

Load index 91 is one of the most common ratings you’ll see on passenger vehicles in the UK. It means the tyre can safely carry up to 615kg when it’s properly inflated. Multiply that by four tyres, and you’re looking at a total of 2,460kg—which covers most hatchbacks, saloons, and even some small SUVs.

If you’re carrying extra weight—roof boxes, bike racks, work tools, or regular passengers—you need to be sure your tyres can handle the strain. Load index 91 is often enough for everyday use, but heavier vehicles or commercial vans might require something higher.

Always check your vehicle handbook, especially if you’re towing a trailer or carrying heavy gear regularly. The weight you’re putting through each tyre changes how that tyre performs—and the load index is there to keep you safe.

What does XL mean on a tyre

You might also see tyres marked with “XL” after the size and load index. This stands for “Extra Load.” These tyres are designed with reinforced sidewalls and can carry heavier loads than standard tyres of the same size.

For example, a standard tyre might have a load index of 91, while the XL version of the same size could be rated at 94 or even higher. That added strength gives you peace of mind if your vehicle is heavier than average or regularly carries additional weight.

It doesn’t mean the tyre is better for every car—but it does mean it can cope with more. Some vehicles (especially vans and SUVs) require XL tyres as standard. Others might benefit from the extra capacity in specific situations, like long road trips, family holidays or when towing.

If you’re ever unsure whether you need standard or XL tyres, just ask. It’s better to be safe than find out the hard way.

Need some advice

If you’re still not sure what load index your tyres should be, we’re here to help. Whether you’re buying a full set, replacing one after a puncture, or just double-checking before a trip, getting the right advice makes all the difference.

We’ll happily check your current tyres, match you up with the right replacements, and explain what all those numbers mean in plain English. There’s no pressure, no guesswork—just honest advice that keeps you safe and legal on the road.

And if you’re ever in doubt, or your car feels like something’s off—whether it’s pulling to one side, the tread looks uneven, or you’ve got a dashboard warning light—bring it in for a free tyre check. We’ll take a look, talk you through what we see, and give you the confidence to keep going.

Because when it comes to safety, peace of mind starts with four tyres you can trust.