Tire load index: explanation, table of values ​​and why it is critical for your safety

Have you ever wondered why on the sidewall of a tire, among incomprehensible numbers and letters, there are mysterious symbols like 91T or 107H? Most drivers only pay attention to the tire size (for example, 205/55 R16), completely ignoring load index - but in vain. This parameter determines how many kilograms one tire can support at the maximum allowable pressure. Exceeding this limit is fraught not only with rapid wear of the tire, but also high speed rupture - the consequences of which can be fatal.

In this article, we will look at what the tire load index actually is (spoiler: it’s not just “load capacity”), how it relates to the speed index, and why car manufacturers strictly regulate these parameters. You will find out whether it is possible to install tires with higher or low index, what the factory recommends, and what will happen if you ignore these rules. And also - a detailed decoding table and answers to common questions that even experienced drivers ask.

What is Tire Load Index: A Simple Explanation

Load index (or Load Index, LI) is numeric code, which indicates the maximum weight per wheel when driving at the maximum speed specified in speed index. It is important to understand:

• 🔢 It's not the weight of the car, and the load on one tire. To find out the total load capacity of all wheels, multiply the index value by 4 (for passenger cars).
• ⚖️ Depends on pressure: If a tire is underinflated, its actual load-carrying capacity drops, even if the index is high.
• 🚗 Takes into account dynamic loads: during sudden braking or turning, the weight on the wheel can exceed the static weight by 1.5–2 times.

For example, index 91 means the tire can withstand 615 kg per wheel (see table below). For a passenger sedan this is more than enough, but if you plan to tow a trailer or often transport heavy loads, you may need tires with the index 95+.

⚠️ Attention: The load index is always indicated together with a speed index (for example, 91T). Using tires with a lower speed index automatically reduces the permissible load, even if the LI number is high!

Where can I see the load index on a tire?

The load index is marked on the sidewall of the tire as a two- or three-digit number, usually next to the speed index (letter). Let's look at an example of marking:

205/55 R16 91V

• 205/55 R16 — tire size (width, profile, diameter).
• 91 — load index (615 kg per wheel).
• V — speed index (up to 240 km/h).

Some tires (especially commercial vehicles) may have double index, for example 102/100R. This means:

• 🚛 102 — load on a single wheel (850 kg).
• 🚚🚚 100 — load on a double wheel (800 kg).

If you can't find the load rating on your tires, check:

Tire load index table (decoding)

Below is the current table of load indices for passenger and commercial tires (according to the standard ETRTO). Please note: values are for maximum pressure in the tire (usually 2.2–2.5 bar for passenger cars).

Load Index (LI)	Max. wheel load (kg)	Type of transport
80	450	Small cars, motorcycles
85	515	City hatchbacks
91	615	Sedans, crossovers (VW Golf, Toyota RAV4)
95	690	SUVs, minivans (Toyota Land Cruiser, Ford Explorer)
105	925	Light trucks, vans (Mercedes Sprinter)
120	1400	Trucks (KAMAZ, MAN)

The full table can be found on the tire manufacturers' websites (Michelin, Continental, Nokian) or standard ISO 4001. If your index is not included in the table, check the markings again: sometimes the numbers are written in small print.

Is it possible to install tires with a different load index?

This is one of the most controversial issues among car owners. Let's take it in order.

1. Tires with higher load index

✅ You can, but with reservations:

• 📈 If the index is 1–2 units higher (for example, instead of 91 put 93), this will only improve the safety margin.
• 💰 Tires with high LI are usually more expensive and have a stiffer cord, which can affect comfort.
• ⚠️ Don't overdo it: index 105 for a passenger car - excessive, since the weight of the car is distributed unevenly (the front axle is more heavily loaded).

2. Tires with lower load index

❌ Absolutely not, if:

• 🚗 The car is loaded to maximum weight (passengers + luggage).
• 🏔️ You drive on bad roads (potholes and bumps increase the dynamic load).
• 🔥 Ambient air temperature is above +30°C (rubber softens, strength decreases).

Exception: if the difference is 1–2 units (for example, 89 instead of 91), and the car is operated in a “gentle” mode (city, half-empty interior). But even in this case the risk of premature tire wear or explosion increases.

⚠️ Attention: Insurance companies may refuse to pay for an accident if an examination shows that the accident occurred due to tires with an inappropriate load index. This is stated in the MTPL rules (clause 2.7).

How is the load index related to the speed index?

Many people think that the load index and speed index (Speed Index, SI) are independent parameters. In fact they are closely related:

• 🔄 The higher the speed, the more the tire heats up and the less it can withstand the load. For example, a tire with index 91T (190 km/h) when driving at maximum speed withstands 615 kg, but if you drive slower (up to 160 km/h), the actual load capacity may be higher.
• ❄️ In winter tires, the speed index is often underestimated (for example, Q (160 km/h) instead of V (240 km/h)), but the load index remains the same. This means that at high speed the load capacity of such a tire falls.

Tire manufacturers conduct tests according to the standard FMVSS 109 (USA) or ECE R30 (Europe), where they test how the combination of load and speed affects the durability of rubber. The results are shocking:

What happens when the load is exceeded at high speed?

During tests, a tire with index 91V, loaded by 650 kg (35 kg excess) and accelerated to 220 km/h, collapsed after 15–20 minutes. At the same time, the temperature inside the tire reached 120°C, which led to cord delamination.

Conclusion: if you often drive with a full load (for example, on vacation with family and luggage), it is better to choose tires with load index reserve and do not exceed the speed limit, indicated in the speed index.

5 myths about the load index that drivers believe

There are many misconceptions surrounding the load index. Let's look at the most common ones:

1. "The load index is the weight of the vehicle"
   

   ❌ No! This is a load on one wheel. To calculate the total load capacity, multiply the value by 4 (for passenger cars) or 6/8 (for trucks with dual wheels).

2. "If the tire can support 600 kg, you can load the car with 2.4 tons"
   

   ❌ Not really. Weight is distributed unevenly: the front axle usually accounts for 55–60% of the weight. For example, at Toyota Camry outside, the load on the front wheels can reach 700–750 kg when fully loaded.

3. "Winter tires can be taken with a lower load index"
   

   ❌ Dangerous! Winter tires are softer and their strength decreases at low temperatures. It's better to choose an index 1–2 units higherthan in summer.

4. "If the pressure is normal, the load index is not important"
   

   ❌ Pressure affects load capacity, but does not cancel LI restrictions. For example, a tire 91T at a pressure of 2.0 bar it can withstand 615 kg, but at 1.8 bar it can withstand 550 kg.

5. “You can put sedan tires on a crossover - they are almost the same”
   

   ❌ Crossovers are heavier and taller, so they have greater dynamic loads on the wheels. For example, Nissan Qashqai weighs 200–300 kg more than Nissan Almera, and requires tires with the index 95+ instead of 91.

How to choose tires based on load index: step-by-step instructions

To avoid making mistakes when purchasing, follow this algorithm:

1. Find out the recommended load index for your car
   

   Look at the sticker on the driver's door, in the owner's manual, or on the manufacturer's website. For example, for Skoda Octavia this is usually 91–94.

2. Determine the actual wheel load
   

   Weigh the car on a loading platform (at recycling points) or calculate approximately:

   (Car weight + passenger weight + cargo weight) × 0.55 (for the front axle) / 2

   For example, if the car weighs 1.5 tons and you are carrying 200 kg of cargo, the load on the front wheel will be ~460 kg. In this case the index 85 (515 kg) will be sufficient.

3. Add a margin of 10–20%
   

   If the estimated load is 500 kg, take tires with the index 87 (545 kg) or 88 (560 kg). This will protect against wear and tear when driving on bad roads.

4. Check speed index compatibility
   

   If you get tires with a higher LI, make sure that the speed index is not lower than the recommended one. For example, for Audi A4 minimum SI - W (270 km/h).

5. Compare prices and reviews
   

   High LI buses (e.g. 98–100) may cost 15–20% more, but it is not always justified to overpay. Study the tests (ADAC, Behind the Wheel) for your car model.

What happens if you ignore the load index?

The consequences depend on how much you exceeded the permissible values:

Excess load	Consequences	Manifestation period
Up to 10%	Accelerated tread wear (by 15–20%)	After 10–15 thousand km
10–20%	Tire overheating, risk of herniation, poor handling	After 5–10 thousand km
20–30%	Cord delamination, swelling on the sidewall, risk of explosion	After 1–3 thousand km
More than 30%	Instant tire rupture during sudden maneuver or braking	Can happen at any time

Real case from practice: owner Renault Duster installed tires with index 88 (560 kg) instead of recommended 95 (690 kg). When fully loaded (5 passengers + luggage) at a speed of 110 km/h, the rear tire burst, which led to a skid and a collision with the bump stop. The examination showed that the load on the wheel exceeded the permissible limit by 25%.

⚠️ Attention: If you buy used tires, check them for residual load capacity. After 3–4 seasons of operation, the actual load index may decrease by 10–15% due to cord wear.

FAQ: Frequently asked questions about tire load index

Is it possible to install tires with different load indexes on the front and rear axles?

❌ No, this is prohibited by traffic regulations (clause 5.5 "List of faults"). The load index should be the same on all wheels of the same axle. A difference of 1–2 units is allowed on the front and rear axles, but only if this is permitted by the car manufacturer (for example, for some pickups).

How does the load index affect fuel consumption?

Tires with a high load index have a stiffer cord and thicker tread, which increases the weight of the wheel by 5–10%. This can increase fuel consumption by 0.3–0.5 l/100 km. However, the difference between the indices 91 and 95 usually insignificant.

What is more important: load index or speed index?

Both parameters are critical, but load index affects safety in everyday use (city, highway with a load), and speed index - on the behavior of the tire in extreme conditions (long trips at high speed). For most drivers, LI is a priority, since overload is more common than driving at speeds above 160 km/h.

Is it possible to drive on tires with a load index lower than the recommended one without overloading the car?

⚠️ Technically possible, but risky. Even with a half-empty cabin, dynamic loads (braking, cornering, potholes) can exceed the permissible values. For example, during sharp braking, the weight on the front wheels increases by 1.5–2 times. If your index 85 (515 kg), and the actual load is 400 kg; during emergency braking, it can reach 600–800 kg, which will lead to damage to the tire.

What load index is needed for electric vehicles?

Electric cars (for example, Tesla Model 3, Nissan Leaf) are 20–30% heavier than gasoline counterparts due to batteries. Manufacturers usually recommend tires with an index 2–3 units higher. For example, if for VW Golf fits 91, then for VW ID.3 (electric version) required 94–95.