255/60 R18 Tyre Size — Meaning, Fitment & Alternatives
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What 255/60 R18 means
255/60 R18 is a 255 mm wide tyre with a sidewall 60% of that width (153 mm), on a 18-inch rim. Overall diameter works out at about 763 mm (30.0 in). It typically fits SUVs, 4x4s and pickups — vehicles in the class of the Land Cruiser, Ranger or RAV4 depending on exact size.
UK: check prices for 255/60 R18 tyres at Tirendo US: check 255/60 R18 prices at WheelHero
255/60 R18 broken down
| Code part | Value | Meaning |
|---|---|---|
| Width | 255 | Section width in millimetres, sidewall to sidewall |
| Profile (aspect ratio) | 60 | Sidewall height as a percentage of width — 153 mm here |
| R | Radial | Radial construction (standard on modern car tyres) |
| Rim | 18 | Wheel diameter in inches (457 mm) |
Computed dimensions
| Measure | Value |
|---|---|
| Overall diameter | 763 mm (30.0 in) |
| Circumference | 2398 mm (94.4 in) |
| Sidewall height | 153 mm |
| Revolutions per mile | ≈ 671 |
| Revolutions per km | ≈ 417 |
These are computed reference values from the size code arithmetic — actual measurements vary slightly by brand and model. Working in different units? Convert mm to inches with the unit converters at 247QuickTools.
Tyre Owner Essentials
Typical vehicles
Sizes in this family split between highway-terrain and all-terrain patterns. The same size can carry very different load ratings, so match the placard's load index, not just the size. To confirm the exact original-equipment sizes for your car, look up your car's full specs, including OE tyre sizes, at 247VehicleCheck.
Checking your current tread? Owners often keep a tread depth gauge in the glovebox — UK legal minimum is 1.6 mm across the central three-quarters of the tread.
Speed and load ratings commonly sold in 255/60 R18
This size is commonly sold in H (130 mph) and V (149 mph) ratings, frequently with reinforced (XL) load indices for SUV and load-carrying use. See the full speed rating table and load index table for what each code is rated to.
Alternative & equivalent sizes (±3% diameter)
Sizes within ±3% of this tyre's 763 mm overall diameter keep your speedometer and gearing close to accurate. Always check clearance, rim width compatibility and load rating before switching, and never mix constructions across an axle.
| Alternative size | Overall diameter | Difference |
|---|---|---|
| 255/50 R20 | 763 mm | -0.0% |
| 255/55 R19 | 763 mm | -0.0% |
| 255/65 R17 | 763 mm | +0.0% |
| 255/70 R16 | 763 mm | +0.0% |
| 235/65 R18 | 763 mm | -0.1% |
| 285/40 R21 | 761 mm | -0.2% |
| 285/45 R20 | 764 mm | +0.2% |
| 235/55 R20 | 766 mm | +0.4% |
| 285/35 R22 | 758 mm | -0.6% |
| 275/50 R19 | 758 mm | -0.7% |
Tyre pressure for 255/60 R18
Correct pressure depends on your vehicle and load, not on the tyre size alone — always follow the placard inside the driver's door or the handbook. Typical car pressures fall between 30 and 36 psi. For psi-to-bar maths, the calculators at 247Calculators can help. A monthly check with an accurate gauge catches slow leaks before they wear the shoulders.
Recommended Accessories
FAQ
What does 255/60 R18 mean?
255/60 R18 means the tyre is 255 mm wide, its sidewall is 60% of that width (153 mm), and it fits a 18-inch wheel. The R stands for radial construction.
What is the overall diameter of a 255/60 R18 tyre?
About 763 mm (30.0 inches), computed from the size code: 18-inch rim plus two sidewalls of 153 mm. Actual measurements vary slightly by brand.
Can I fit a different size instead of 255/60 R18?
Only if the alternative stays within about ±3%% of the original overall diameter, fits your rim width, clears the bodywork and meets the placard's load and speed ratings. When in doubt, keep the placard size.
What pressure should 255/60 R18 tyres run at?
Pressure is set by the vehicle, not the tyre size — check the placard inside the driver's door or your handbook. Typical car values fall between 30 and 36 psi.
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.