Tyre Speed Rating S — 112 mph (180 km/h)
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Quick answer
A tyre marked S is rated for a maximum sustained speed of 112 mph (180 km/h) when correctly inflated and within its load limit. It suits small city cars and some winter fitments.
Where S sits in the speed rating table
| Symbol | Max mph | Max km/h |
|---|---|---|
| N | 87 | 140 |
| P | 93 | 150 |
| Q | 99 | 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 |
| ZR | 149 | 240 |
Tyre Owner Essentials
Mixing and replacement rules
Replacement tyres should meet or exceed the speed rating specified on your vehicle placard or handbook — a lower rating can affect insurance validity in the UK and safety margins everywhere. If tyres with different ratings are ever mixed (best avoided), the vehicle must be driven within the capability of the lowest-rated tyre, and matching pairs must sit on the same axle. Winter tyres are the recognised exception: a lower rating (commonly Q, R or S) is acceptable in many markets provided a speed-restriction reminder is displayed.
The speed symbol sits at the end of the size code — for example 205/55 R16 91S. If you're reading the whole code for the first time, our guide on how to read a tyre size walks through every part, and you can check the sidewall date with a tread depth gauge to hand for the tread while you're there.
Insurers in the UK generally expect replacement tyres to meet or exceed the vehicle's specified rating. When in doubt, fit the rating shown in your handbook. For per-tyre weight limits, check the tyre data handbook against the load index table.
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FAQ
What does the S speed rating mean?
A S-rated tyre is certified for a sustained maximum of 112 mph (180 km/h) at full load and correct pressure.
Can I fit S-rated tyres if my car specifies a higher rating?
It is not recommended, and in the UK it may affect your insurance. Fit the rating your placard or handbook specifies, or higher. Dedicated winter tyres are a common exception, with a speed-limit reminder in view of the driver.
Is a higher speed rating than specified OK?
Yes — fitting a higher rating than specified is always acceptable. It usually costs slightly more and may ride a little firmer.
Related pages on this site
Last updated:
Data: computed reference values (ETRTO tyre-size arithmetic), build date 22 July 2026. Reference only — always follow your vehicle manufacturer's placard or handbook.