Tyre size 255/45 R20
Find 255/45 R20 Tyres
Free guidance for 255/45 R20 tyres. Premium SUVs. Always confirm fitment on your tyre sidewall.
Tyre Size Checker
Enter a UK tyre size such as 205/55 R16 91V to decode the width, profile, rim, load index and speed rating.
Find your tyre size on the sidewall, the driver's door frame, fuel flap or vehicle handbook.
- This tyre size may be incomplete. A full tyre size often looks like 205/55 R16 91V. Check your tyre sidewall for the load index and speed rating.
What 255/45 R20 means
255 is the section width in millimetres. 45 is the profile (sidewall height as a percentage of the width). R is radial construction. 20 is the wheel rim diameter in inches.
A full tyre size also includes a load index and speed rating, e.g. 255/45 R20 91V. The load index maps to a maximum weight per tyre, and the speed rating maps to a maximum speed at full load.
Where 255/45 R20 is commonly fitted
Premium SUVs.
Even when a tyre size is common, the specific tyre that's right for your vehicle depends on the load index, speed rating, and sometimes whether the original equipment is run-flat or EV-rated. Always confirm with your tyre sidewall, vehicle handbook or a qualified UK tyre fitter before fitting.
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You can find this on your tyre sidewall.
This tyre size may be incomplete. A full tyre size often looks like 205/55 R16 91V. Check your tyre sidewall for the load index and speed rating.
Step 1 of 7 — Start
What to check before fitting
- Confirm the size on your tyre sidewall
- Match or exceed the original load index and speed rating
- Check the EU tyre label for wet grip, fuel and noise
- Pick the right type — summer, all-season or winter
- Fit as a full set or at least a matched pair on the same axle
Frequently asked questions
Quick answers about UK tyre fitment, MOT rules and seasonal options.
What speed rating should I look for on 255/45 R20?
Speed rating is a single letter at the end of the size — H (210 km/h), V (240 km/h), W (270 km/h), Y (300 km/h). Use the original specification for your car as the minimum.
Does fitting 255/45 R20 affect my insurance?
If 255/45 R20 is the original size for your car, fitting it doesn't affect insurance. If you're switching from the OEM size to 255/45 R20, you may need to declare it — particularly if it's a wider or larger-rim option.
What does 255/45 R20 mean?
255/45 R20 reads as: 255mm tread width, sidewall height 45% of width (≈ 115mm sidewall), and a 20-inch rim diameter. A complete size includes a load index and speed rating, e.g. 255/45 R20 91V.
Is 255/45 R20 a common UK tyre size?
255/45 R20 is fitted on a number of UK-market cars, so most major brands stock it. Cross-check our model pages to see if your specific car uses this size.
Are summer, all-season and winter tyres available in 255/45 R20?
Most popular UK sizes — including 255/45 R20 — are available as summer, all-season and winter tyres. For UK conditions, all-season tyres with the 3PMSF symbol suit drivers who want a single set year-round.
Tyre sizes related to 255/45 R20
Same rim, similar width or profile — common alternatives UK drivers compare with 255/45 R20.
Tyre Finder UK provides general tyre guidance only. We do not guarantee tyre fitment, local stock, prices or fitting availability. Always confirm your tyre size, load rating, speed rating and vehicle requirements using your current tyre sidewall, vehicle handbook, manufacturer guidance or a qualified tyre fitter before fitting.