Ever wondered if mixing tyre speed ratings could save you a pretty penny—or maybe even boost your car’s performance? Before you hit the road with mismatched tyres, there’s a lot more at stake than you might think.
When it comes to your vehicle’s tyres, you might be tempted to experiment with different speed ratings. While it’s technically possible, the real question is: should you? Understanding the implications and potential risks is crucial. That is why at Asda Tyres we have compiled all you need to know about tyre speed ratings into one handy guide for you.
What’s a Tyre Speed Rating?
A tyre speed rating is a letter assigned to a tyre that indicates the maximum speed it can safely maintain over time. You can find the tyre’s speed rating on the sidewall of the tyre. It’s usually part of the tyre size information, located at the end of a sequence of numbers and letters.
This rating is determined under controlled conditions and is based on the tyre’s performance, stability, and durability at high speeds. Speed ratings are important because they make sure that your tyres are capable of handling the speed demands of your car.
Understanding Tyre Speed Ratings and Their Importance
Does the tyre speed rating matter?
Yes, the tyre speed rating does matter. Your car can go fast but the speed rating reflects the tyres ability to maintain that speed performance, handle the heat from the constant spinning and remain stable at higher speeds. You need a tyre that can handle your speed consistently. If you use a tyre with a lower speed rating that your car needs, it can lead to poor handling, reduced safety, and may even void your car insurance.
What does W or Y mean on tyres?
The letters “W” and “Y” are examples of tyre speed ratings. These letters indicate the maximum speed a tyre can safely handle. Specifically:
- W: This rating means the tyre can safely sustain speeds up to 169 mph (270 km/h).
- Y: This rating signifies the tyre can safely sustain speeds up to 187 mph (300 km/h).
Where can I find the tyre speed rating?
You can find the speed rating on the sidewall of your tyre. It is usually located at the end of the tyre size information. For example, in the tyre size “225/45R17 91Y,” the “Y” is the speed rating. Always check your vehicle’s manual or consult with a professional to make sure you’re using tyres with the correct speed rating.
Can You Mix Tyres with Different Speed Ratings?
Is It Safe to Mix Tyres with Different Speed Ratings?
It is generally not recommended to mix tyres with different speed ratings on your vehicle. It can lead to uneven performance, especially at higher speeds. But if you absolutely have to do it, make sure the tyres with the higher speed rating go on the rear axle. This way, you’ll have better control and stability on the road.
Can I Use Tyres of the Same Size But Different Speed Ratings on One Axle?
You can technically put tyres of the same size but with different speed ratings on one axle, but it’s not the best idea. Doing this can mess with your car’s handling and compromise your safety. To keep your ride smooth and safe, it’s better to stick with tyres that have the same speed rating on both sides of the axle.
Mixing Tyres: Brands, Types, and Conditions
Mixing Run Flat Tyres with Conventional Tyres
It’s generally a bad idea to mix run-flat tyres with regular tyres. Run-flats are designed to handle a puncture differently, and combining them with conventional tyres can result in unpredictable handling and performance issues.
Mixing Different Brand Tyres
Mixing tyres from different brands isn’t ideal either. Each brand has its own tread patterns, rubber compounds, and design quirks, which can mess with your car’s handling and safety. For the best performance, it’s smarter to stick with the same brand and model on all four wheels.
Mixing Summer & Winter Tyres
Mixing summer and winter tyres is not recommended. These tyres are designed for different weather conditions—summer tyres perform the best in temperatures over 7°C and winter tyres for cold, icy roads with temperature below 7°C. Mixing them can mess with your car’s performance in both types of weather and make driving less safe.
Tyre speed rating chart
| Speed Symbol | Max Speed mph | Max Speed km/h | Speed Symbol | Max Speed mph | Max Speed km/h |
| M | 81 | 130 | H | 130 | 210 |
| P | 93 | 150 | V | 150 | 240 |
| Q | 99 | 160 | W | 169 | 270 |
| R | 106 | 170 | Y | 187 | 300 |
| S | 112 | 180 | ZR | Over 150 | Over 240 |
| T | 118 | 190 |
Whilst you can technically fit tyres with different speed ratings, it’s not advisable due to potential safety risks and handling issues. Always strive to use tyres with the same speed rating, brand, and type for the best performance and safety.For more help, contact us at Asda Tyres today. We stock leading brands like Bridgestone, Michelin, Goodyear and many more brands! So we can help you find the right tyres for you.