R18 Tyre Sizes — All Common 18-Inch Sizes
Last updated 5 September 2026. Compiled and checked by the 247TyreCheck editorial team — see our editorial standards.
Every common metric tyre size on a 18-inch rim in our reference, with computed diameters, equivalent sizes and typical fitments on each page. Wheels this size are typical of performance cars, premium models and larger SUVs.
All R18 sizes in our reference
- 215/35 R18
- 215/40 R18
- 215/45 R18
- 215/55 R18
- 225/35 R18
- 225/40 R18
- 225/45 R18
- 225/50 R18
- 225/55 R18
- 225/60 R18
- 235/40 R18
- 235/45 R18
- 235/50 R18
- 235/55 R18
- 235/60 R18
- 235/65 R18
- 245/35 R18
- 245/40 R18
- 245/45 R18
- 245/50 R18
- 245/60 R18
- 255/35 R18
- 255/40 R18
- 255/45 R18
- 255/55 R18
- 255/60 R18
- 255/65 R18
- 255/70 R18
- 265/35 R18
- 265/40 R18
- 265/60 R18
- 265/65 R18
- 275/35 R18
- 275/40 R18
- 275/45 R18
- 275/60 R18
- 275/65 R18
- 275/70 R18
- 285/60 R18
- 285/65 R18
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Not sure which size your car takes? The placard inside the driver's door lists approved sizes, or look up your car's full specs, including OE tyre sizes, at 247VehicleCheck.
FAQ
How many tyre sizes are available on an R18 rim?
40 common metric sizes in our reference — every combination actually sold for a 18-inch wheel, not every mathematically possible width/profile pairing.
Can I switch from R18 to a different rim size?
Only with a matching tyre profile change to keep overall diameter within about ±3%% — check each size page's alternatives table, and confirm brake caliper clearance and load rating for the new wheel before buying.
Do bigger rims like R18 mean a harsher ride?
Generally yes, for a given vehicle — a larger rim usually means a shorter sidewall (lower profile), which flexes less and transmits more road surface detail. It's a styling and handling trade-off, not a defect.
Where do I check which R18 sizes fit my specific car?
The placard inside the driver's door (or the vehicle handbook) lists the manufacturer-approved sizes — that always overrides any general guide, including this one.
Last updated:
Data: computed reference values (ETRTO tyre-size arithmetic), build date 5 September 2026. Reference only — always follow your vehicle manufacturer's placard or handbook.