Key takeaways
- The speed rating is the letter at the end of your tyre size code, such as the V in 205/55 R16 91V.
- Each letter sets a maximum rated speed: T is 118 mph, H is 130 mph, V is 149 mph, W is 168 mph and Y is 186 mph.
- You must fit at least the speed rating your vehicle requires; a lower rating can be an MOT concern and may affect insurance.
- The rating reflects heat tolerance and construction, not a target speed, and UK limits always apply.
- You can usually fit a higher rating than required, but not a lower one, unless using winter tyres within specific rules.
The speed rating is the small letter hiding at the end of your tyre size, and plenty of drivers never give it a thought. Yet fitting the wrong one can affect how your car handles, whether it passes scrutiny and even your insurance. This guide explains what the rating means, gives the full UK chart, and shows how to make sure your replacements are rated correctly for your car.
What is a tyre speed rating?
A tyre speed rating is a letter that shows the maximum speed a tyre is designed to sustain safely when correctly inflated and loaded. It sits at the very end of the size code, for example the V in 205/55 R16 91V. The rating reflects the tyre's construction and heat tolerance, not a speed you are meant to drive.
Every car has a minimum speed rating specified by its manufacturer, based on the car's top speed and performance. You should always fit tyres that meet or exceed that rating. It is one of several markings on the sidewall, sitting right after the load index number.
What is the UK speed rating chart?
The speed rating runs through the alphabet, with each letter standing for a maximum speed. The most common ratings on UK cars are T, H, V, W and Y, covering everything from family hatchbacks to performance cars. The table below lists the ratings you are most likely to see, in both miles and kilometres per hour.
| Speed symbol | Maximum speed | Typical use |
|---|---|---|
| Q | 99 mph (160 km/h) | Some winter tyres, 4x4s |
| T | 118 mph (190 km/h) | Family cars, vans, MPVs |
| H | 130 mph (210 km/h) | Saloons and many hatchbacks |
| V | 149 mph (240 km/h) | Sportier and higher-powered cars |
| W | 168 mph (270 km/h) | Performance cars |
| Y | 186 mph (300 km/h) | High-performance cars |
You may also see ZR on some performance tyres, an older marking for speeds above 149 mph, now usually paired with a W or Y in brackets. For most ordinary cars, T, H or V will be the rating to look for.
Where do you find your speed rating?
Your tyre's speed rating is the last letter of the size code moulded into the sidewall, right after the load index. So in 205/55 R16 91V, the V is the speed rating and 91 is the load index. The minimum rating your car needs is listed in the handbook and often on the door placard.
If your existing tyres are the correct ones, simply match their rating when you replace them. If you are unsure whether the right tyres were fitted before, check the handbook rather than copying what is on the car. Reading the full code is covered in our guide on the numbers on your tyre.
Can you fit a lower speed rating?
No, you should not fit a lower speed rating than your vehicle requires. A lower-rated tyre may not cope with the heat and stresses your car can generate, which can affect handling and safety. It can also raise questions at MOT and, importantly, may invalidate your insurance if it does not meet the maker's specification.
Fitting a higher rating than required is generally fine and sometimes unavoidable, as it simply exceeds the requirement. The one common exception is winter tyres, which the rules allow to carry a lower speed rating in some cases, provided you observe the reduced maximum. Outside that, always match or exceed the specified rating.
Why does the speed rating matter for handling?
The speed rating reflects more than top speed; it relates to the tyre's construction, stiffness and heat resistance. A higher-rated tyre is usually built to handle greater forces, which can mean sharper steering response. Fitting a much lower rating than designed can leave the car feeling vague and may struggle under sustained motorway speeds in summer heat.
This is why matching the maker's specification matters beyond the legal and insurance angle. The car was developed around tyres of a certain rating, so straying below it changes how it behaves. If you want a more comfortable ride, the profile and tyre choice matter more than dropping the speed rating, which is best left at or above standard.
Getting the right tyres fitted
When buying replacements, match the size, load index and speed rating on your current tyres or in the handbook, and you cannot go wrong. The tyre numbers guide explains the full code, and our load index guide covers the number just before the speed letter. When you need new tyres fitted correctly, Fast Tyre brings mobile tyre fitting to your home, work or roadside across London and central England, so the right rating is matched for you on the spot.
Frequently asked questions
It is the maximum speed the tyre is designed to sustain safely when correctly inflated and loaded. The letter sits at the end of the size code, such as V in 205/55 R16 91V. It reflects construction and heat tolerance, not a speed you are meant to drive.
A V rating means the tyre is rated to a maximum of 149 mph (240 km/h). UK speed limits still apply, so this is not a target. It simply describes the speed the tyre can withstand, and many sportier and higher-powered cars specify a V rating.
No. You should fit at least the rating your vehicle requires. A lower rating may not handle the car's heat and forces, can raise MOT concerns and may invalidate your insurance. Winter tyres are a limited exception, where a lower rating is allowed within set rules.
Yes, generally. A higher rating than your car requires simply exceeds the specification and is safe to fit. It will not improve your legal top speed, since UK limits apply, but it is fine and is sometimes the only option in a given size.
It is listed in your owner's handbook and often on the door placard. The rating on your current tyres is also moulded into the sidewall as the last letter of the size code, but check the handbook if you are unsure the correct tyres were fitted.
It can. The rating relates to the tyre's construction and stiffness, so a higher-rated tyre is usually built for greater forces and can feel sharper. Fitting a much lower rating than designed may leave the car feeling vague and can struggle under sustained motorway speeds.