Tyre size 285/45 R21
Find 285/45 R21 Tyres
Free guidance for 285/45 R21 tyres. Premium and luxury 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 285/45 R21 means
285 is the section width in millimetres. 45 is the profile (sidewall height as a percentage of the width). R is radial construction. 21 is the wheel rim diameter in inches.
A full tyre size also includes a load index and speed rating, e.g. 285/45 R21 91V. The load index maps to a maximum weight per tyre, and the speed rating maps to a maximum speed at full load.
Where 285/45 R21 is commonly fitted
Premium and luxury 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 do EU tyre labels show for 285/45 R21?
Every new tyre — including 285/45 R21 — carries an EU label rating fuel efficiency, wet grip and external noise. For UK driving, prioritise wet grip first.
Can I read 285/45 R21 backwards from a wheel listing?
If you only know the wheel — for example a 21-inch alloy with width X — the tyre size is usually engraved or labelled separately. Don't assume from rim diameter alone; many cars run different widths and profiles on the same rim size.
What kind of car typically uses 285/45 R21?
21-inch rims with a 285mm tread are common on performance cars, large SUVs and luxury saloons in the UK.
What load index do I need with 285/45 R21?
Load index is on the placard inside your driver's door frame. 285/45 R21 can be ordered in different load indices (e.g. 91, 94, XL/RF) — match or exceed the original specification for your car.
Can I fit a different size to 285/45 R21?
Only fit a size approved for your specific car. Changing width, profile, rim, load or speed rating affects handling, braking, fuel economy and MOT. Approved alternatives are usually listed in the vehicle handbook.
Tyre sizes related to 285/45 R21
Same rim, similar width or profile — common alternatives UK drivers compare with 285/45 R21.
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.