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Tire size · 18-inch wheel · about 31.1x10.0R18

255/65R18 tire size

Overall diameter, nominal31.1 in

Estimate ±789 mm

A 255/65R18 tire is 31.1 in (789 mm) tall and 10.0 in (255 mm) wide on a 18-inch wheel, with a 6.5 in sidewall, and turns about 650 times a mile.

Stock on the Ford Explorer (2025), Ford Ranger (2024–2026) and Volkswagen Amarok (2023 and 2025), per their makers’ documents.

Width
10.0 in
Sidewall
6.5 in
Wheel
18 in
Revs per mile
650

01 / Dimensions

255/65R18 in inches and millimeters

What the size code works out to. A real tire of the size measures within about 1.5% of it, by brand, tread, wheel width and pressure.

255/65R18

Estimate ±
Overall diameter
31.1 in 789 mm30.6 to 31.5 in for real tires
Section width
10.0 in 255 mm
Sidewall height
6.5 in 166 mm
Wheel diameter
18 in 457 mm
Circumference
97.6 in 2,478 mm
Revolutions per mile
650 404 per km640 to 659

02 / Stock on

Vehicles that leave the factory on 255/65R18

Which configurations run it in which model years, printed the way each maker prints the size, and how it compares with the vehicle’s other stock sizes. A speedometer set for one of those reads off by the amount shown when you fit 255/65R18 instead.

  • Ford ExplorerMaker
    • 2025 · Activeprinted P255/65R18

    Ford Explorer model years on 255/65R18:

    Its other stock sizes

    • 255/55R20 (2025 · ST-Line; Platinum). 255/65R18 is the same height as 255/55R20, so a speedometer set for it reads true.
    • 275/45R21 (2025 · ST). 255/65R18 is 0.3 in taller: with a speedometer set for 275/45R21 it reads 1.0% low, 60.6 mph at an indicated 60.
  • Ford RangerMaker
    • 2024–2026 · Lariatprinted 255/65R18

    Ford Ranger model years on 255/65R18:

    Its other stock sizes

    • 285/70R17 (2024–2026 · Raptor). 255/65R18 is 1.7 in shorter: with a speedometer set for 285/70R17 it reads 5.3% high, 57.0 mph at an indicated 60.
    • 255/70R17 (2024–2026 · XL; XLT). 255/65R18 is the same height as 255/70R17, so a speedometer set for it reads true.
  • Volkswagen AmarokMaker
    • 2025 · Australia · Style; PanAmericanaprinted 255/65R18
    • 2023 · Australia · Style; PanAmericanaprinted 255/65R18

    Volkswagen Amarok model years on 255/65R18:

    Its other stock sizes

    • 255/70R17 (2023 and 2025 · Core, Life). 255/65R18 is the same height as 255/70R17, so a speedometer set for it reads true.
    • 275/45R21 (2023 and 2025 · Aventura). 255/65R18 is 0.3 in taller: with a speedometer set for 275/45R21 it reads 1.0% low, 60.6 mph at an indicated 60.

Documents last checked . How we read them and what the marks mean: how we source the numbers. A figure doesn’t match its document? Report a wrong number.

03 / Nearby sizes

Sizes either side of 255/65R18

The nearest common upsizes and the next sizes down on the same wheel, from the stock sizes we cover and the sizes owners usually step up to, and sizes about as tall on another wheel.

Nearest sizes up

Nearest sizes up, compared with 255/65R18
SizeTallinHeightvs 255/65R18Widthvs 255/65R18At an indicated 60true mphCompare
285/60R1831.5+0.4 in+1.2 in60.859.9 to 61.7Compare →
245/70R1831.5+0.5 in−0.4 in60.960.0 to 61.8Compare →
265/65R1831.6+0.5 in+0.4 in61.060.1 to 61.9Compare →

Next sizes down

Next sizes down, compared with 255/65R18
SizeTallinHeightvs 255/65R18Widthvs 255/65R18At an indicated 60true mphCompare
275/60R1831.0−0.1 in+0.8 in59.959.0 to 60.8Compare →
265/60R1830.5−0.5 in+0.4 in59.058.1 to 59.9Compare →

About as tall, other wheels

About as tall, other wheels, compared with 255/65R18
SizeTallinHeightvs 255/65R18Widthvs 255/65R18At an indicated 60true mphCompare
255/70R1731.1±0.0 in±0.0 in60.059.1 to 60.9Compare →
255/55R2031.0±0.0 in±0.0 in60.059.1 to 60.9Compare →
275/65R1731.1±0.0 in+0.8 in60.059.1 to 60.9Compare →
31x10.50R1531.0−0.1 in+0.5 in59.959.0 to 60.8Compare →

04 / Next

Compare it with your size

Tire size calculator255/65R18 against 285/60R18, or any two sizes: height, speedometer and gearing.Compare sizesTire sizes by vehicleEvery stock size on the trucks and SUVs we cover.Browse sizesFord Explorer tiresStock tires and wheels by trim, and what bigger tires change on the Ford Explorer.See the tiresFord Ranger tiresStock tires and wheels by trim, and what bigger tires change on the Ford Ranger.See the tires

05 / FAQ

Questions people ask

What is 255/65R18 in inches?

About 31.1x10.0R18: 31.1 in tall and 10.0 in wide on a 18-inch wheel.

Which vehicles come with 255/65R18 tires?

In our data: Ford Explorer (2025), Ford Ranger (2024–2026) and Volkswagen Amarok (2023 and 2025).

How does 255/65R18 compare with the Ford Explorer’s other stock sizes?

255/65R18 is the same height as 255/55R20, so a speedometer set for it reads true. 255/65R18 is 0.3 in taller: with a speedometer set for 275/45R21 it reads 1.0% low, 60.6 mph at an indicated 60.

What is the next size up from 255/65R18?

285/60R18: about 0.4 in taller and 1.2 in wider. On a speedometer set for 255/65R18 it reads 1.3% low (60.8 mph at an indicated 60).