EXPERT IN AUTO PARTS
25 May 2023 Table of Contents
The tyre speed rating, also known as the speed index, is a crucial standard that indicates the maximum speed at which tyres are safely designed to operate. This rating is determined based on the maximum design speed of the vehicle, which can be found in the vehicle registration document. The design speed takes into account the specific type and individual specifications of the vehicle. However, tyre manufacturers have the flexibility to assign a higher or lower speed class to a vehicle's tyres, allowing for variations in performance and safety.
If you need new car tyres, it is essential to pay attention to this parameter. In case you are on the lookout for optimal tyre performance, check out our 195 65 r15 tyres prices and 225 40 r18 tyres for your car.
The tyre speed rating is prominently displayed in the tyre designation on the sidewall of the tyre. In addition to the speed index, you will also find crucial information such as the seasonal designation, type and width of the tyre, production date, and more. It’s important to note that the speed index appears at the end of the sequence of numbers and letters, directly following the load rating. This load rating indicates the maximum weight that the tyre can safely support, complementing the tyre speed index to inform you of the tyre's overall performance capabilities.
In the UK, the focus on road safety and adherence to vehicle specifications is paramount. Fitting tyres with the correct speed rating is not just a matter of legal compliance but also a key factor in ensuring optimal vehicle performance and safety.
For instance, using a tyre with a lower correct speed rating than recommended can lead to premature wear, reduced handling ability, and even tyre failure, especially at high speeds.
Moreover, with the UK's variable weather conditions, including frequent rain, having tyres that perform reliably at the correctspeed index is crucial. Tyres with higher speed ratings typically offer better handling and grip, which are essential for safe driving in wet conditions prevalent in the UK.
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A
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£ 75,29
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-46%
Goodyear EAGLE F1 (ASYMMETRIC
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£ 393,60
£ 210,40
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£ 312,00
£ 167,49
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Maxxis AP2 All Season
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B
69 dB
£ 47,85
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Understanding the tyre speed rating chart is essential for ensuring that you equip your vehicle with tyres that are safe and suitable for your driving needs. The speed rating, represented by a letter, indicates the maximum speed a tyre can handle when properly inflated and loaded. Below is a comprehensive tyre speed rating chart that outlines the speed ratings along with their corresponding maximum speeds in both miles per hour (MPH) and kilometres per hour (KMH).
| Letter (Speed Rating) | Maximum Speed (mph) | Maximum Speed (km/h) |
|---|---|---|
| A1 | 3 | 5 |
| A2 | 6 | 10 |
| A3 | 9 | 15 |
| A4 | 12 | 20 |
| A5 | 16 | 25 |
| A6 | 19 | 30 |
| A7 | 22 | 35 |
| A8 | 25 | 40 |
| B | 31 | 50 |
| C | 37 | 60 |
| D | 40 | 65 |
| E | 43 | 70 |
| F | 50 | 80 |
| G | 56 | 90 |
| J | 62 | 100 |
| K | 68 | 110 |
| L | 75 | 120 |
| M | 81 | 130 |
| N | 87 | 140 |
| P | 93 | 150 |
| Q | 100 | 160 |
| R | 106 | 170 |
| S | 112 | 180 |
| T | 118 | 190 |
| U | 124 | 200 |
| H | 130 | 210 |
| V | 149 | 240 |
| W | 168 | 270 |
| Y | 186 | 300 |
| (Y) | 186+ | 300+ |
It's important to note that most standard road vehicles are fitted with tyres rated 'H' or 'V', while high-performance vehicles often come equipped with tyres rated 'W', 'Y', or even '(Y)' for optimal performance. When purchasing new tyres, ensure that you adhere to the manufacturer's recommendations for speed ratings, as exceeding the rated speed can compromise tyre integrity and safety.
When selecting tyres for your motorcycle, it's essential to choose a speed rating that matches or exceeds the maximum speed capabilities of your bike. Higher performance motorcycles often require tyres with higher speed ratings, ensuring they can safely handle the stresses of high-speed riding and acceleration. Using tyres with an insufficient speed index can compromise safety, leading to tyre failure or decreased handling performance.
Make sure to consult your motorcycle’s owner manual or manufacturer specifications to verify the recommended speed index and always opt for tyres that align with both ETRTO standards and the specific needs of your bike. By understanding and adhering to these guidelines, riders can enhance their safety and riding experience.
Choosing a tyre with an incorrect speed rating can lead to serious consequences beyond legal issues. Here's why it's essential for your safety and vehicle longevity:
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Article number
B
72 dB
£ 103,12
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-34%
Hankook Ventus Prime 4 K135
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B
69 dB
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£ 141,96
£ 93,60
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-53%
Hankook K127E
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A
69 dB
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£ 326,40
£ 150,60
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-56%
Pirelli P Zero PZ4 LS
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B
71 dB
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£ 333,87
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You can fit tyres with a higher speed rating than required. For example, upgrading from a V (149 mph) to a W (168 mph) or Y (186 mph) can enhance traction and cornering. Ensure the new tyres match your vehicle's load index for safe operation.
Upgrading does not require informing your insurance company and will not incur penalties. However, avoid downgrading to a lower speed index, as this could compromise safety and insurance coverage.
No, you shouldn't fit tyres with a lower speed rating than your vehicle requires. The speed index indicates the maximum safe speed when loaded. Using tyres below the recommended rating can pose safety risks and legal issues. In the UK, compliance with vehicle specifications, including tyre ratings, is crucial for road safety and can lead to fines or increased penalties if violated. Winter tyres may have a lower speed classification but can be used in specific situations contrary to summer tyres.
When choosing summer tyres for car, you must adhere strictly to the manufacturer's specifications. EU Directive 92/23/EEC states that you may use winter tyres with a lower speed index as long as you visibly display a marking for the driver and, of course, also adhere to the maximum permitted speed.
Mixing tyres of different speed ratings is unsafe and may compromise vehicle performance. Each rating denotes a maximum safe speed: for example, a "V" rated tyre supports speeds up to 149 mph, while an "H" rated tyre is for 130 mph. Mixing can impair handling, particularly during hard braking.If it's essential to use lower-rated tyres, place them on the front axle to minimize the risk of oversteer, but do not exceed the maximum speed of the lowest-rated tyre. Using tyres that fall below your manufacturer's recommendations could affect safety and insurance coverage in case of an accident.To ensure safety, use identical tyres with matching ratings on all wheels for optimal performance. Consult your vehicle manual or a tyre specialist for accurate tyre specifications.
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