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Tire size · 18-inch wheel · about 32.1x10.0R18

255/70R18 tire size

Overall diameter, nominal32.1 in

Estimate ±814 mm

A 255/70R18 tire is 32.1 in (814 mm) tall and 10.0 in (255 mm) wide on a 18-inch wheel, with a 7.0 in sidewall, and turns about 629 times a mile.

Stock on the Ford Bronco (2021–2026), INEOS Grenadier (2024–2025), Jeep Gladiator (2020–2023 and 2026) and 3 more, per their makers’ documents.

Width
10.0 in
Sidewall
7.0 in
Wheel
18 in
Revs per mile
629

01 / Dimensions

255/70R18 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.

255/70R18

Estimate ±
Overall diameter
32.1 in 814 mm31.6 to 32.5 in for real tires
Section width
10.0 in 255 mm
Sidewall height
7.0 in 179 mm
Wheel diameter
18 in 457 mm
Circumference
100.7 in 2,558 mm
Revolutions per mile
629 391 per km620 to 639

02 / Stock on

Vehicles that leave the factory on 255/70R18

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 255/70R18 instead.

  • Ford BroncoMaker
    • 2023–2026 · Outer Banksprinted P255/70R18
    • 2021–2022 · Outer Banksprinted 255/70R18

    Ford Bronco model years on 255/70R18:

    Its other stock sizes

    • 37x12.50R17 (2022–2026 · Raptor). 255/70R18 is 4.9 in shorter: with a speedometer set for 37x12.50R17 it reads 15.4% high, 52.0 mph at an indicated 60.
    • 315/70R17 (2021–2026 · Heritage Edition, Stroppe Edition; Base, Outer Banks, Badlands with the Sasquatch Package (765); Big Bend with the Black Diamond Package (51D) + Sasquatch Package (765)). 255/70R18 is 2.3 in shorter: with a speedometer set for 315/70R17 it reads 7.2% high, 56.0 mph at an indicated 60.
    • 285/70R17 (2021–2026 · Badlands). 255/70R18 is 0.7 in shorter: with a speedometer set for 285/70R17 it reads 2.0% high, 58.8 mph at an indicated 60.
    • 255/75R17 (2021–2026 · Big Bend). 255/70R18 is the same height as 255/75R17, so a speedometer set for it reads true.
    • 265/70R17 (2021–2026 · Big Bend with the Black Diamond Package (51D), Free Wheeling Package (51F) or Black Appearance Package (51E); Outer Banks with the Black Appearance Package (51E)). 255/70R18 is 0.4 in taller: with a speedometer set for 265/70R17 it reads 1.4% low, 60.9 mph at an indicated 60.
    • 255/70R16 (2021–2023 and 2025–2026 · Base). 255/70R18 is 2.0 in taller: with a speedometer set for 255/70R16 it reads 6.2% low, 64.0 mph at an indicated 60.
  • INEOS GrenadierMaker
    • 2025 · Australia · Grenadier with the 18-inch wheels; Grenadier with the Rough Pack + 18-inch wheels; Trialmaster with the 18-inch wheels; Fieldmaster with the 18-inch wheels; Fieldmaster with the Rough Pack + 18-inch wheelsprinted 255/70R18, LT255/70R18
    • 2024 · Australia · Fieldmasterprinted 255/70R18

    INEOS Grenadier model years on 255/70R18:

    Its other stock sizes

    • 265/70R17 (2024–2025 · Grenadier; Trialmaster; Fieldmaster; Grenadier with the Rough Pack; Fieldmaster with the Rough Pack). 255/70R18 is 0.4 in taller: with a speedometer set for 265/70R17 it reads 1.4% low, 60.9 mph at an indicated 60.
  • Jeep GladiatorMaker
    • 2026 · Sport with the Tire option 255/70R18printed 255/70R18
    • 2022–2023 · Overland; Overland with the Optional all-terrain tires (same size as the standard tires)printed 255/70R18
    • 2020–2021 · Overlandprinted 255/70R18

    Jeep Gladiator model years on 255/70R18:

    Its other stock sizes

    • 315/70R17 (2026 · Sport with the Tire option LT315/70R17C, with a package). 255/70R18 is 2.3 in shorter: with a speedometer set for 315/70R17 it reads 7.2% high, 56.0 mph at an indicated 60.
    • 285/70R17 (2020–2023 and 2026 · Mojave, Rubicon; Mojave, Rubicon with the Optional mud-terrain tires (same size as the standard tires)). 255/70R18 is 0.7 in shorter: with a speedometer set for 285/70R17 it reads 2.0% high, 58.8 mph at an indicated 60.
    • 255/75R17 (2026 · Willys; Sport with the Tire option LT255/75R17C; Willys with the Optional mud-terrain tires (same size as the standard tires); Rubicon with the Tire option LT255/75R17C). 255/70R18 is the same height as 255/75R17, so a speedometer set for it reads true.
    • 245/75R17 (2020–2023 and 2026 · Sport, Sport S). 255/70R18 is 0.6 in taller: with a speedometer set for 245/75R17 it reads 1.8% low, 61.1 mph at an indicated 60.
  • Jeep WranglerMaker
    • 2026 · Sahara; Sahara with the All-terrain tires (same size as the standard tires)printed P255/70R18
    • 2024–2025 · Sahara 2.0L turbo I-4 gasoline; Sahara 2.0L turbo I-4 gasoline with the All-terrain tires (same size as the standard tires); Sahara 2.0L turbo I-4 4xe plug-in hybrid with the 255/70R18 tiresprinted P255/70R18, 255/70R18
    • 2022–2023 · Sahara 2.0L turbo I-4 gasoline/3.6L Pentastar V6 gasoline/3.0L dieselprinted P255/70R18
    • 2021 · Sahara 2.0L turbo I-4 gasoline/3.6L Pentastar V6 gasoline/3.0L diesel; Sahara 2.0L turbo I-4 4xe plug-in hybrid with the 255/70R18 tiresprinted P255/70R18, 255/70R18
    • 2019–2020 · Sahara; Sport with the 255/70R18 tires; Sahara with the 255/70R18 tires; Rubicon with the 255/70R18 tiresprinted 255/70R18, P255/70R18
    • 2018 · Sahara Four-door 8-speed automatic/D478 6-speed manual; Sport 8-speed automatic/D478 6-speed manual with the 255/70R18 tires; Sahara Four-door 8-speed automatic/D478 6-speed manual with the 255/70R18 tires; Rubicon 8-speed automatic/D478 6-speed manual with the 255/70R18 tiresprinted 255/70R18, P255/70R18
    • 2016 · Saharaprinted P255/70R18
    • 2014 · Saharaprinted P255/70R18
    • 2008–2012 · Saharaprinted P255/70R18

    Jeep Wrangler model years on 255/70R18:

    Its other stock sizes

    • 315/70R17 (2021–2026 · Moab 392; Sport with the LT315/70R17C tires; Rubicon with the Xtreme 35 Package or LT315/70R17C tires). 255/70R18 is 2.3 in shorter: with a speedometer set for 315/70R17 it reads 7.2% high, 56.0 mph at an indicated 60.
    • 285/75R17 (2024–2026 · Sport with the LT285/75R17C tires, with a package). 255/70R18 is 1.8 in shorter: with a speedometer set for 285/75R17 it reads 5.5% high, 56.9 mph at an indicated 60.
    • 285/70R17 (2018–2026 · Rubicon; Rubicon with the Beadlock-capable 17 x 8 in. wheels). 255/70R18 is 0.7 in shorter: with a speedometer set for 285/70R17 it reads 2.0% high, 58.8 mph at an indicated 60.
    • 255/75R17 (2008–2012, 2014, 2016 and 2021–2025 · Rubicon with the LT255/75R17C tires). 255/70R18 is the same height as 255/75R17, so a speedometer set for it reads true.
    • 255/60R20 (2024–2025 · Sport S). 255/70R18 is the same height as 255/60R20, so a speedometer set for it reads true.
    • 275/55R20 (2021–2025 · Sahara 2.0L turbo I-4 4xe plug-in hybrid; High Altitude). 255/70R18 is 0.1 in taller: with a speedometer set for 275/55R20 it reads 0.5% low, 60.3 mph at an indicated 60.
    • 245/75R17 (2018–2026 · Sport; Sport with the All-terrain tires (same size as the standard tires); Sport with the 245/75R17 tires). 255/70R18 is 0.6 in taller: with a speedometer set for 245/75R17 it reads 1.8% low, 61.1 mph at an indicated 60.
    • 245/75R16 (2008 · Right-Hand Drive; X with the S package (X S / Sport S)). 255/70R18 is 1.6 in taller: with a speedometer set for 245/75R16 it reads 4.9% low, 63.1 mph at an indicated 60.
    • 225/75R16 (2008–2012, 2014 and 2016 · Sport). 255/70R18 is 2.8 in taller: with a speedometer set for 225/75R16 it reads 8.6% low, 65.7 mph at an indicated 60.
  • Land Rover DefenderMaker
    • 2025–2026 · UK · Standardprinted 255/70R18
    • 2023 · UK · Hard Topprinted 255/70R18
    • 2021 · UK · Defender, Hard Topprinted 255/70R18
    • 2020 · UK · Defenderprinted 255/70R18

    Land Rover Defender model years on 255/70R18:

    Its other stock sizes

    • 255/65R19 (2020–2021 and 2023 · X-Dynamic S). 255/70R18 is the same height as 255/65R19, so a speedometer set for it reads true.
    • 255/60R20 (2020–2021, 2023 and 2025 · Trim not specified Defender 90 D250; Trim not specified Defender 90/Defender 110 Hard Top, 2 seats/Hard Top, 3 seats D350). 255/70R18 is the same height as 255/60R20, so a speedometer set for it reads true.
    • 275/45R22 (2023 and 2025–2026 · Trim not specified Defender 130 V8 P500). 255/70R18 is 0.3 in taller: with a speedometer set for 275/45R22 it reads 1.0% low, 60.6 mph at an indicated 60.
  • Toyota TundraMaker
    • 2018–2021 · SR, SR5printed P255/70R18
    • 2016 · SR, SR5printed P255/70R18
    • 2015 · SR, SR5; TRD Proprinted P255/70R18
    • 2014 · SR, SR5printed P255/70R18
    • 2011–2013 · Tundraprinted P255/70R18
    • 2010 · Tundraprinted 255/70R18
    • 2007 · SR5, Limited, Tundraprinted 255/70R18

    Toyota Tundra model years on 255/70R18:

    Its other stock sizes

    • 275/65R18 (2010–2013, 2016 and 2019–2021 · TRD Pro). 255/70R18 is the same height as 275/65R18, so a speedometer set for it reads true.
    • 275/55R20 (2013–2016 and 2018–2021 · Limited, Platinum, 1794 Edition). 255/70R18 is 0.1 in taller: with a speedometer set for 275/55R20 it reads 0.5% low, 60.3 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 255/70R18

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 255/70R18
SizeTallinHeightvs 255/70R18Widthvs 255/70R18At an indicated 60true mphCompare
245/75R1832.5+0.4 in−0.4 in60.859.9 to 61.7Compare →
285/65R1832.6+0.5 in+1.2 in61.060.1 to 61.9Compare →
265/70R1832.6+0.6 in+0.4 in61.060.1 to 61.9Compare →

Next sizes down

Next sizes down, compared with 255/70R18
SizeTallinHeightvs 255/70R18Widthvs 255/70R18At an indicated 60true mphCompare
265/65R1831.6−0.5 in+0.4 in59.158.2 to 60.0Compare →
245/70R1831.5−0.6 in−0.4 in59.058.1 to 59.9Compare →

About as tall, other wheels

About as tall, other wheels, compared with 255/70R18
SizeTallinHeightvs 255/70R18Widthvs 255/70R18At an indicated 60true mphCompare
255/75R1732.1±0.0 in±0.0 in60.059.1 to 60.9Compare →
255/65R1932.1±0.0 in±0.0 in60.059.1 to 60.9Compare →
255/60R2032.0±0.0 in±0.0 in60.059.1 to 60.9Compare →
285/45R2232.1±0.0 in+1.2 in60.159.2 to 61.0Compare →

04 / Next

Compare it with your size

Tire size calculator255/70R18 against 245/75R18, or any two sizes: height, speedometer and gearing.Compare sizesTire sizes by vehicleEvery stock size on the trucks and SUVs we cover.Browse sizesFord Bronco tiresStock tires and wheels by trim, and what bigger tires change on the Ford Bronco.See the tiresINEOS Grenadier tiresStock tires and wheels by trim, and what bigger tires change on the INEOS Grenadier.See the tires

05 / FAQ

Questions people ask

What is 255/70R18 in inches?

About 32.1x10.0R18: 32.1 in tall and 10.0 in wide on a 18-inch wheel.

Which vehicles come with 255/70R18 tires?

In our data: Ford Bronco (2021–2026), INEOS Grenadier (2024–2025), Jeep Gladiator (2020–2023 and 2026), Jeep Wrangler (2008–2012, 2014, 2016 and 2018–2026), Land Rover Defender (2020–2021, 2023 and 2025–2026) and Toyota Tundra (2007, 2010–2016 and 2018–2021).

How does 255/70R18 compare with the Jeep Wrangler’s other stock sizes?

255/70R18 is 2.3 in shorter: with a speedometer set for 315/70R17 it reads 7.2% high, 56.0 mph at an indicated 60. 255/70R18 is 1.8 in shorter: with a speedometer set for 285/75R17 it reads 5.5% high, 56.9 mph at an indicated 60. 255/70R18 is 0.7 in shorter: with a speedometer set for 285/70R17 it reads 2.0% high, 58.8 mph at an indicated 60.

What is the next size up from 255/70R18?

245/75R18: about 0.4 in taller and 0.4 in narrower. On a speedometer set for 255/70R18 it reads 1.3% low (60.8 mph at an indicated 60).