We would always recommend that the same size and type of tyre, with the same speed ratings, are fitted on all tyres. Bear in mind that all tyres must be appropriate for the vehicle and you should drive no faster than your lowest rated tyres. This is to prevent a potential oversteer scenario. If you are going to mix speed ratings, which we don’t recommend, make sure the lower rated tyres are on the front axle, regardless of whether your vehicle is front-, rear- or four-wheel drive. Can I mix speed ratings on my vehicles tyres? The speed rating of a tire indicates the speed category (or maximum range of speed) at which the tire can carry a load under specified service conditions. You can increase the speed rating of your vehicle’s tyres for improved performance, but can never decrease it without reducing the vehicle’s top speed to that of the lower speed rating selected. That’s why V, Z, W and Y-rated tyres are usually better suited to high performance vehicles in warmer climates. A higher speed rating generally offers better grip and stopping power, but it may have a lower tread life and reduced performance in cold weather. That’s why it’s important to check the tire speed rating before you buy because you don’t want to get 4 new tires that don’t match the top speed of. It is marked using a letter from A to Z, which you can then use to look up the maximum speed in miles per hour or kilometers per hour. As the tire speed rating chart shows, some unusual letters catch a bit more attention, such as H is before U and Z is lower than W and Y. They’re also about ride comfort, traction, tread wear and cornering ability. A tire’s speed rating, also call its speed index, tells you the maximum speed a tire can safely maintain over time while carrying its maximum load (which is specified in the tire load index).
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