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Understanding the dimensions written on your tyres is essential to ensure their compatibility with your vehicle and guarantee your safety. Each number and letter on the side of your tyres has a specific meaning that helps to identify their technical specifications. Here is a detailed guide to help you decipher this information.

Width:

The width of the tyre is the first number in the series written on the side and is measured in millimetres. For example, if you see "205" on your tyres, this means that the tyre width is 205 mm.

Height:

The height is the number following the width. It is expressed as a percentage and represents the height of the tyre sidewall relative to its width. Thus, a tyre marked "55" has a sidewall whose height is equal to 55% of its width. A lower aspect ratio means a shorter sidewall, which improves responsiveness but may reduce driving comfort.

Diameter:

The diameter, indicated by the last number in the dimension series, refers to the inner diameter of the tyre, or in other words, the size of the rim on which the tyre can be mounted. Measured in inches, this number must match the size of your vehicle's rims to ensure proper fitting.

Load and speed index:

The load index and the speed index often appear after the tyre dimensions. The load index is a number that indicates the maximum load that each tyre can bear, while the speed index is represented by a letter indicating the maximum speed at which the tyre can safely travel. Ignoring these indices can compromise safety and affect driving performance.

Additional markings:

• DOT: The DOT (Department of Transportation) number indicates that the tyre meets American safety standards and provides information about the manufacturing plant and the production date.
• Runflat: Runflat tyres can continue to roll at a limited speed even in the event of total pressure loss.
• 3PMSF: The 3PMSF (Three Peak Mountain Snow Flake) symbol indicates that the tyre is certified for performance in severe winter conditions.
• See all additional markings on our glossary.

Importance for the MOT:

Respecting the specifications written on your tyres is important not only for your safety but also for passing the MOT without any problems. Tyres that do not conform to your vehicle's specifications or are worn can result in a MOT failure.

Knowing when to change your tyres is important to ensure your safety on the road, as well as that of other road users. Several indicators can signal that it's time to replace your tyres. Here are the main ones to watch out for.

Tread depth

European legislation requires that the minimum tread depth of tyres be 1.6 mm. However, it is recommended not to wait until this limit is reached to replace them. A deep tread improves grip and reduces the risk of aquaplaning in the rain. To measure this depth, you can use a tread depth indicator available in most car accessory shops or even a simple coin. Insert the coin into the tyre grooves and check how far it goes in. If the outer part of the coin is visible, it's time to change your tyres.

Uneven wear

An uneven wear of the tread surface can indicate several problems, such as a wheel alignment issue, a suspension problem, or incorrect tyre pressure. Regular inspections can reveal worn areas on the shoulders or in the centre of the tyre, potentially signalling underinflation. If you notice abnormal wear, it is advisable to consult a specialist to check the alignment and overall condition of the tyres and vehicle. A tyre rotation is recommended in case of uneven wear to extend their lifespan.

Abnormal vehicle behaviour

If you notice that your vehicle is sliding more than usual on the road, that braking becomes less effective, or that driving seems unstable, your tyres could be to blame. These signs may indicate that your tyres have lost their grip and their ability to interact properly with the road. A degradation in your car's road behaviour is a clear signal that the tyres need to be examined and probably replaced.

Visible damage

Regularly check your tyres for cuts, cracks, bulges or any other signs of deterioration. Damage to the tread or sidewalls can compromise the tyre's structure, increasing the risk of a dangerous puncture. If you notice visual anomalies, it is prudent to replace the affected tyre.

Tyre age

Even if your tyres do not appear worn, it is recommended to replace them after ten years, according to manufacturers' recommendations. Over time, rubber naturally degrades, even if the vehicle is not frequently used. Check the manufacturing date (DOT) on the tyre sidewall to know its age.

When it comes to choosing tyres for your vehicle, it's essential to consider the specific conditions in which you regularly drive. More than the brand of the tyres, it's the suitability to the driving environment that will ensure performance and safety.

The importance of the driving environment

The choice between summer, winter or all-season tyres should primarily be based on the climatic conditions of your region. Summer tyres are ideal for temperatures above 7°C and dry or slightly wet roads, offering increased grip and precision. In contrast, winter tyres are designed to provide maximum safety below 7°C or on snow or ice thanks to better traction. For those who live in areas where weather conditions vary moderately throughout the year, all-season tyres can be a practical option, although they are not specialised for extreme conditions.

The performance of lesser-known brands

Lesser-known tyre brands, including those of Asian origin, have made huge strides in terms of quality and performance. These brands now offer products that, although purportedly less performant than premium brands, present a difference often imperceptible to consumers. Tyre technology has evolved to such a point that basic safety is assured, regardless of the brand.

Consumer reviews: a valuable resource

Rather than focusing solely on the brand, it is advisable to take into account the opinions of other users. Ratings and comments can provide valuable information on the durability, performance and comfort of tyres in real conditions. These reviews are all the more useful when they come from drivers with driving habits similar to yours or using the same types of roads.

The choice of a Premium or Quality or Discount brand.

Opting for a premium brand can be seen as a luxury choice. Although these brands often offer slightly superior technological advances, the additional investment is not essential to ensure safety. Tyres from all brands sold on reputable sites meet strict safety standards and are perfectly suited for safe daily driving. In a word, the choice is yours! Select according to your preferences and based on what feels most comfortable to you.

Each of these tyre types is designed to offer optimal performance in distinct environmental conditions and possesses unique characteristics.

Summer Tyres

The summer tyres are specially designed to excel in hot and dry climates, but also on wet roads. Their rubber is formulated to stay hard even at high temperatures, which allows for better grip and slower wear when it's hot. Their tread pattern is less deep and with fewer sipes (thin grooves), which maximises contact with the road and improves traction on dry or slightly wet roads. However, these tyres become less efficient and can harden when the temperature drops below 7°C, reducing their grip.

Winter Tyres

Unlike summer tyres, the winter tyres are designed to offer safety and control in harsh winter conditions, including snow, ice and extremely low temperatures. Their rubber composition remains flexible even at temperatures below freezing point, thus allowing for better grip. Winter tyres have deep tread patterns and are equipped with numerous sipes that help to evacuate water and bite into snow and ice. They are also often capable of receiving studs for additional traction on ice. They perform better than summer tyres below 7°C.

All-Season Tyres

The all-season tyres are designed to provide acceptable performance in a variety of weather conditions: dry, wet, and sometimes slightly snowy. They are a compromise between summer and winter tyres, eliminating the need to change tyres with the seasons. However, while they are convenient, they do not offer all the specialised performance of summer or winter tyres. Their tread is less effective than that of winter tyres in severe freezing conditions and less adhesive than that of summer tyres on dry and hot roads. These tyres have made enormous progress and are increasingly equipping cars.

When choosing tyres for your vehicle, you may come across the terms "original fitment" and "manufacturer marking".

Original Fitment

The "original fitment", often referred to by the abbreviation "OE" for "Original Equipment", refers to the tyres that are installed on a vehicle during its manufacture. The original fitment is therefore perfectly suited to the driving characteristics and design of the vehicle, including handling, weight, speed and braking capabilities.

Manufacturer Marking

The "manufacturer marking" (or "manufacturer approval"), sometimes identified by specific codes such as MO (Mercedes-Benz Original), AO (Audi Original), or N-spec (Porsche), indicates that the tyres have been tested and approved by a particular car manufacturer for use on certain models of their vehicles. These tyres have been specifically selected and designed in close collaboration between the tyre manufacturer and the car manufacturer to meet the specifications and performance required for a particular vehicle model. Manufacturer marking is not mandatory, and tyres marked by a manufacturer can be used on vehicles from other manufacturers.

The need to change all four tyres simultaneously depends on the type of vehicle traction as well as the wear of the existing tyres. Here are specific guidelines on when and why it is necessary to replace one or more tyres.

All-wheel drive vehicles

For vehicles equipped with all-wheel drive, it is generally recommended to replace all four tyres at the same time. The main reason is to avoid differences in diameter between the tyres, which can cause uneven stresses on the transmission and potentially damage the vehicle's transmission system. All-wheel drive vehicles are particularly sensitive to even minor differences in tyre size, which can lead to costly transmission problems.

Two-wheel drive vehicles

For front or rear-wheel drive vehicles, it is possible to change the tyres by axle. This means that you can replace the front or rear tyres separately, depending on wear. However, it is important to ensure that the difference in tread depth between the tyres on the same axle does not exceed 5 mm. This practice helps to maintain uniform wear and ensures a stable and safe drive.

Driving with worn tyres may seem harmless, but it's a practice that endangers not only the driver and their passengers, but also other road users. Tyres are one of the most important elements of your safety; they are the only link between the vehicle and the road. Tyre wear affects driving ability and can significantly increase the risk of accidents. Here is a detailed exploration of the dangers associated with using worn tyres.

1. Decreased grip

Grip is a key point for maintaining control of the vehicle, especially in adverse weather conditions. A new tyre has deep grooves that allow water to be evacuated, thus reducing the risk of aquaplaning where the vehicle loses contact with the road and slides uncontrollably. As tyres wear, the depth of these grooves decreases, reducing their ability to evacuate water and increasing the risk of slipping on wet roads.

2. Increased braking distance

Good condition tyres ensure effective braking. Tyre wear can significantly lengthen the distance needed to come to a complete stop. On wet or slippery roads, this distance can increase even more, raising the risk of collisions. Studies show that worn tyres can increase braking distance by several metres, which could be the difference between avoiding an accident and being involved in one.

3. Increased risk of puncture

Worn tyres are more likely to suffer punctures or blowouts, as the thin rubber can no longer effectively protect against sharp objects on the road. A blown tyre can be catastrophic, especially at high speed, as it can lead to a loss of vehicle control.

4. Effects on handling

The handling of the vehicle is greatly influenced by the condition of the tyres. Worn tyres can lead to a delayed or unpredictable response when cornering or performing avoidance manoeuvres. This can make the vehicle less stable and more difficult to control, especially in emergency situations.

5. Impact on fuel consumption

Driving with worn tyres can also increase fuel consumption. Uneven wear and a reduction in optimal tyre tension increase rolling resistance, which forces the engine to work harder and consume more fuel to maintain the same speed.

By adopting a few simple practices, you can maximise the longevity of your tyres and ensure they stay in good condition for as long as possible. Here are some tips to achieve this.

1. Maintain adequate tyre pressure

One of the most critical factors affecting tyre lifespan is inflation pressure. Under-inflated or over-inflated tyres can lead to uneven and premature wear, reduce energy efficiency, and even pose safety risks. Check your tyre pressure at least once a month and before long journeys, referring to the vehicle manufacturer's recommendations, usually indicated on a label in the door frame or in the owner's manual.

2. Perform regular tyre rotations

Tyre rotation is recommended to ensure even wear. This involves changing the tyres' position on the vehicle, usually based on a front/rear and left/right pattern. Most experts recommend rotating the tyres every 10,000 to 12,000 kilometres, or as specified in your owner's manual.

3. Check and adjust wheel alignment

Incorrect wheel alignment can cause rapid and uneven tyre wear. If you notice that your vehicle pulls to one side or that the steering wheel is not centred when you drive straight, it is likely that the wheel alignment needs to be corrected. Have the alignment checked and adjusted by a professional at least once a year or according to your car manufacturer's recommendations.

4. Drive cautiously

Driving habits have a significant impact on tyre lifespan. Abrupt accelerations, hard braking, and high-speed turns can accelerate tyre wear. Smoother and more predictable driving can help reduce wear and extend the life of your tyres.

5. Regularly check tyre wear

Inspect your tyres regularly for signs of wear, such as cracks, cuts, bulges, or foreign objects stuck in the tread. Use a tread depth indicator to check if the tyres still have enough depth to drive safely. The legal limit for tread depth is usually 1.6 mm.

6. Avoid excessive loads

Overloading your vehicle can also accelerate tyre wear by increasing the pressure exerted on them. Make sure not to exceed the maximum load recommended by your vehicle's manufacturer.

Our site lists garages all over the country, ready to receive and fit your tyres. During the ordering process, you have the option to choose a garage for delivery, or to have the tyres delivered to the address of your choice and then go to the garage you prefer for fitting. On our Delivery and Fitting page, you can consult the complete list of our partner garages and select the one that best meets your expectations in terms of services offered, rates charged and reviews left by other users. Our partner garages, always attentive to our customers' satisfaction, are evaluated by them and commit to offering the best possible service.

Buying tyres online has become a common and safe practice, backed by years of practices and experiences from all stakeholders. However, choosing our site for your purchases makes this experience even better, thanks to our exceptional customer service, competitive prices and our wide selection of products.

Maturity and expertise of our services

By choosing our site, you are opting for the European market leader, a guarantee of not making a mistake. Delivering several million tyres each year to individuals and professionals, we demonstrate our ability to handle large volumes of orders efficiently. With us, quality, price and service are priorities. We have won the loyalty of hundreds of thousands of customers and remain faithful to our values, which are the foundation of this trust.

Optimised processes for a quality customer experience

We have implemented sophisticated logistical processes that guarantee fast and safe deliveries. Our after-sales service is also a major asset of our platform, with dedicated teams ready to assist our customers in their choices and to ensure the follow-up of their orders. In addition, our site offers a wide range of products accompanied by detailed customer reviews, allowing everyone to find the tyres that perfectly suit their vehicle and their budget. Thanks to the information available online and our possible assistance, choosing the right product becomes an easy and reassuring task for our customers.

Significant savings

Buying tyres on our site is not only economically advantageous, but it also reflects our commitment to offering the most competitive rates on the market. Thanks to our unmatched buying and selling volumes in Europe, as well as our solid partnerships, we constantly strive to offer tyres at the lowest prices. Moreover, the ability to easily compare prices and features of different tyres from the comfort of your home enhances the convenience and efficiency of your shopping experience.