Tires are important components on vehicles that form the direct point of contact between the vehicle and the road. They are designed to provide grip, carry loads, absorb shocks and support vehicle movement. The right tire choice can affect fuel efficiency, handling and safety on the road. Choose the right tire for your electric car based on our speed index, load index and correspondence tables.
Speed index
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When it comes to tires, it's not just the size and tread that count.
The speed index plays a critical role in ensuring safety while driving. Every driver should be aware of its importance.
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Basics of the speed index
The speed index is an indicator that clearly shows the maximum speed of the tire in safe conditions.
On the sidewall of each tire you will find a combination of numbers and letters, the last letter of which represents the tire's speed index. This letter, which varies between J and Y for most passenger cars, informs you about the tire's construction, load capacity and, most importantly, its speed limit.
On the sidewall of each tire you will find a combination of numbers and letters, the last letter of which represents the tire's speed index. This letter, which varies between J and Y for most passenger cars, informs you about the tire's construction, load capacity and, most importantly, its speed limit.
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Speed Index Table Meaning
Each letter in the speed index represents a certain speed in km/h. For example, the letter 'W' represents a maximum speed of 270 km/h. This means that the tire is tested and safe to use up to this speed under the right conditions.
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While both summer and winter tires have their specific speed indices, there are some clear differences between them:
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- Summer tires: These tires tend to have a higher speed index, often due to their construction, tread pattern and rubber compound. Summer roads also allow higher speeds, which is reflected in the design of the tires. A typical speed index for summer tires should be at least 180 km/h.
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- Winter tires: They are adapted for colder climates and therefore have a generally lower speed index. With their rougher tread and softer rubber, they are optimized for lower speeds on winter surfaces. A typical winter tire should have an index of at least 160 km/h.
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Advice for Safe Tire Use
It can be tempting to go for a cheaper tire with a lower speed rating, but it's important not to compromise on safety.
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Your choice of tires should always match or exceed your car's recommended speed rating. In addition, although it may be permissible to fit winter tires with a lower speed rating than summer tires, you should always follow your car's recommendations for best performance and safety.
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Maximal km/h
- J - 100 km/h
- L - 120 km/h
- M - 130 km/h
- N - 140 km/h
- P - 150 km/h
- Q - 160 km/h
- R - 170 km/h
- S - 180 km/h
- T - 190 km/h
- U - 200 km/h
- H - 210 km/h
- V - 240 km/h
- W - 270 km/h
- Y - 300 km/h
Load index
Understanding Tire Load Index
The tire load index, often referred to as the load index or load rating, is a numerical code associated with a tire's maximum carrying capacity at the speed indicated by its speed rating. In other words, it indicates how much weight a tire can safely carry when properly inflated.
What do the numbers mean?
The load index is usually two or three numbers found on the sidewall of the tire. For example, if the load index is 91, it means that the tire can carry a maximum weight of 615 kg. This figure should not be confused with the air pressure in the tire, but rather it is an indication of the strength of the tire and its ability to carry loads.
The importance of the right load index
Selecting the right tires with the correct load index for your vehicle is crucial. Using tires with the wrong load index can lead to tire failure and potentially dangerous situations, especially at high speeds or under heavy loads.
To ensure you have the correct load index for your vehicle, always consult your vehicle manual or a tire expert. Following the recommendations will not only ensure your safety, but also the performance of your vehicle and the life of your tires.
Choose the right tire for your rims
When it comes to choosing tires for your car, it's not just the quality and tread depth of the tire that matters. The size and type of rim are also critical factors to consider.
Matching the right tire size to the intended rim ensures optimal performance, ride comfort and safety.
Why is Matching Important?
A tire that doesn't properly match the rim can lead to serious safety issues. If the tire is too big for the rim
it can lead to insufficient contact with the road, reducing grip and increasing the risk of skidding. On the other hand, if the tire is too
small, it can cause overheating due to insufficient air circulation, which reduces tire life and can lead to sudden tire explosion.
The Correspondence Table: Your Guide to the Right Match
To help car owners, there are correspondence tables that clarify which tire sizes go with which rim sizes. This table
takes into account the width, height and diameter of the tire, and matches these dimensions with the correct rim size. For example, if you have a
rim with a diameter of 17 inches, the table may show that tires with the dimensions 225/45 R17 would be suitable.
Other Factors to Consider
- Rim Width: In addition to the diameter, you should also consider the width of the rim when matching the tire. A too wide rim can stretch
expand the tire more than is safe, while a rim that is too narrow can compress the tire and affect its performance.
- Car Load: The tire's load index is also important. It represents the maximum load
the tire can handle. Make sure your chosen tire meets your car's load requirements.
- Driving Style and Terrain: If you frequently drive on difficult terrains or at high speeds,
it may be advisable to choose tires specifically designed for these conditions.
Finally, when choosing tires for your rims, always consult with an expert if you are unsure.
And remember to regularly check the condition and air pressure of your tires to ensure safe and efficient driving.