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Tire size · 18-inch wheel · about 33.2x10.8R18

275/70R18 tire size

Overall diameter, nominal33.2 in

Estimate ±842 mm

A 275/70R18 tire is 33.2 in (842 mm) tall and 10.8 in (275 mm) wide on a 18-inch wheel, with a 7.6 in sidewall, and turns about 608 times a mile.

Stock on the Chevrolet Silverado 1500 (2022), Ford Expedition (2025), Ford F-150 (2021–2026) and 3 more, per their makers’ documents.

Width
10.8 in
Sidewall
7.6 in
Wheel
18 in
Revs per mile
608

01 / Dimensions

275/70R18 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.

275/70R18

Estimate ±
Overall diameter
33.2 in 842 mm32.7 to 33.7 in for real tires
Section width
10.8 in 275 mm
Sidewall height
7.6 in 193 mm
Wheel diameter
18 in 457 mm
Circumference
104.2 in 2,646 mm
Revolutions per mile
608 378 per km599 to 618

02 / Stock on

Vehicles that leave the factory on 275/70R18

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 275/70R18 instead.

  • Chevrolet Silverado 1500Maker
    • 2022 · ZR2printed LT275/70R18

    Chevrolet Silverado 1500 model years on 275/70R18:

    Its other stock sizes

    • 255/70R17 (2022 · WT Special Service Vehicle). 275/70R18 is 2.1 in taller: with a speedometer set for 255/70R17 it reads 6.3% low, 64.1 mph at an indicated 60.
  • Ford ExpeditionMaker
    • 2025 · Tremorprinted P275/70R18

    Ford Expedition model years on 275/70R18:

    Its other stock sizes

    • 275/60R20 (2025 · Platinum). 275/70R18 is 0.2 in taller: with a speedometer set for 275/60R20 it reads 0.5% low, 60.3 mph at an indicated 60.
    • 265/70R18 (2025 · Active). 275/70R18 is 0.6 in taller: with a speedometer set for 265/70R18 it reads 1.7% low, 61.0 mph at an indicated 60.
  • Ford F-150Maker
    • 2021–2026 · Tremorprinted 275/70R18

    Ford F-150 model years on 275/70R18:

    Its other stock sizes

    • 37x12.50R17 (2021 and 2023–2026 · Raptor R; Raptor with the Raptor 37 Package (802A)). 275/70R18 is 3.8 in shorter: with a speedometer set for 37x12.50R17 it reads 11.6% high, 53.8 mph at an indicated 60.
    • 315/70R17 (2021–2026 · Raptor). 275/70R18 is 1.2 in shorter: with a speedometer set for 315/70R17 it reads 3.6% high, 57.9 mph at an indicated 60.
    • 275/60R20 (2024–2026 · King Ranch 5.5-ft box 4x2; King Ranch 4x4; Platinum 5.5-ft box 4x2; Platinum 4x4). 275/70R18 is 0.2 in taller: with a speedometer set for 275/60R20 it reads 0.5% low, 60.3 mph at an indicated 60.
    • 275/65R18 (2024–2026 · STX 4x4; XLT 4x4, Lariat 4x4). 275/70R18 is 1.1 in taller: with a speedometer set for 275/65R18 it reads 3.3% low, 62.0 mph at an indicated 60.
    • 265/70R17 (2021–2026 · XL 4x4). 275/70R18 is 1.6 in taller: with a speedometer set for 265/70R17 it reads 4.7% low, 62.9 mph at an indicated 60.
    • 265/60R18 (2024–2026 · STX 4x2; Lariat 5.5-ft box 4x2). 275/70R18 is 2.6 in taller: with a speedometer set for 265/60R18 it reads 8.0% low, 65.2 mph at an indicated 60.
    • 245/70R17 (2021–2026 · XL 4x2; XLT 4x2). 275/70R18 is 2.7 in taller: with a speedometer set for 245/70R17 it reads 8.0% low, 65.2 mph at an indicated 60.
  • Ford Super DutyMaker
    • 2017–2024 · Series not specified F-350 SRW with the 18-in/20-in all-terrain and 20-in all-season tires (F-350 SRW)printed LT275/70R18

    Ford Super Duty model years on 275/70R18:

    Its other stock sizes

    • 285/75R18 (2020–2024 · Series not specified Crew Cab 6.75-ft box 4x4 with the Tremor Off-Road Package (17Y), with a package). 275/70R18 is 1.7 in shorter: with a speedometer set for 285/75R18 it reads 5.0% high, 57.1 mph at an indicated 60.
    • 275/65R18 (2017–2024 · Series not specified F-350 SRW with the 18-in wheels and tires (F-350 SRW), with a package). 275/70R18 is 1.1 in taller: with a speedometer set for 275/65R18 it reads 3.3% low, 62.0 mph at an indicated 60.
    • 225/70R19.5 (2017–2024 · Series not specified Regular Cab/Crew Cab 8-ft box F-450). 275/70R18 is 1.3 in taller: with a speedometer set for 225/70R19.5 it reads 3.8% low, 62.4 mph at an indicated 60.
    • 245/75R17 (2017–2024 · Series not specified F-250/F-350 SRW; Series not specified 8-ft box F-350 DRW). 275/70R18 is 1.7 in taller: with a speedometer set for 245/75R17 it reads 5.1% low, 63.2 mph at an indicated 60.
  • Nissan TitanMaker
    • 2019–2024 · PRO-4Xprinted 275/70R18

    Nissan Titan model years on 275/70R18:

    Its other stock sizes

    • 265/75R18 (2019–2021 · S Crew Cab). 275/70R18 is 0.5 in shorter: with a speedometer set for 265/75R18 it reads 1.5% high, 59.1 mph at an indicated 60.
    • 275/60R20 (2019–2024 · Platinum Reserve). 275/70R18 is 0.2 in taller: with a speedometer set for 275/60R20 it reads 0.5% low, 60.3 mph at an indicated 60.
    • 265/70R18 (2019–2024 · SV Crew Cab; SV King Cab). 275/70R18 is 0.6 in taller: with a speedometer set for 265/70R18 it reads 1.7% low, 61.0 mph at an indicated 60.
  • Ram 2500Maker
    • 2026 · Tradesman, Big Horn, Laramie, Limited with the Tire option LT275/70R18Eprinted LT275/70R18E

    Ram 2500 model years on 275/70R18:

    Its other stock sizes

    • 285/60R20 (2026 · Tradesman, Big Horn, Laramie, Limited, Power Wagon with the Tire option LT285/60R20E, with a package). 275/70R18 is 0.3 in shorter: with a speedometer set for 285/60R20 it reads 0.9% high, 59.4 mph at an indicated 60.
    • 285/70R17 (2026 · Tradesman 4x4, Power Wagon with the Tire option LT285/70R17D, with a package). 275/70R18 is 0.4 in taller: with a speedometer set for 285/70R17 it reads 1.4% low, 60.8 mph at an indicated 60.
    • 245/70R17 (2026 · Tradesman with the Tire option LT245/70R17E, with a package). 275/70R18 is 2.7 in taller: with a speedometer set for 245/70R17 it reads 8.0% low, 65.2 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 275/70R18

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 275/70R18
SizeTallinHeightvs 275/70R18Widthvs 275/70R18At an indicated 60true mphCompare
265/75R1833.6+0.5 in−0.4 in60.960.0 to 61.8Compare →
295/70R1834.3+1.1 in+0.8 in62.061.1 to 62.9Compare →
325/65R1834.6+1.5 in+2.0 in62.761.7 to 63.6Compare →

Next sizes down

Next sizes down, compared with 275/70R18
SizeTallinHeightvs 275/70R18Widthvs 275/70R18At an indicated 60true mphCompare
265/70R1832.6−0.6 in−0.4 in59.058.1 to 59.9Compare →
285/65R1832.6−0.6 in+0.4 in59.058.1 to 59.9Compare →

About as tall, other wheels

About as tall, other wheels, compared with 275/70R18
SizeTallinHeightvs 275/70R18Widthvs 275/70R18At an indicated 60true mphCompare
33x12.50R1533.0−0.2 in+1.7 in59.758.8 to 60.6Compare →
33x12.50R2233.0−0.2 in+1.7 in59.758.8 to 60.6Compare →
275/60R2033.0−0.2 in±0.0 in59.758.8 to 60.6Compare →
285/60R2033.5+0.3 in+0.4 in60.659.6 to 61.5Compare →

04 / Next

Compare it with your size

Tire size calculator275/70R18 against 265/75R18, or any two sizes: height, speedometer and gearing.Compare sizesTire sizes by vehicleEvery stock size on the trucks and SUVs we cover.Browse sizesChevrolet Silverado 1500 tiresStock tires and wheels by trim, and what bigger tires change on the Chevrolet Silverado 1500.See the tiresFord Expedition tiresStock tires and wheels by trim, and what bigger tires change on the Ford Expedition.See the tires

05 / FAQ

Questions people ask

What is 275/70R18 in inches?

About 33.2x10.8R18: 33.2 in tall and 10.8 in wide on a 18-inch wheel.

Which vehicles come with 275/70R18 tires?

In our data: Chevrolet Silverado 1500 (2022), Ford Expedition (2025), Ford F-150 (2021–2026), Ford Super Duty (2017–2024, with a package), Nissan Titan (2019–2024) and Ram 2500 (2026, with a package).

How does 275/70R18 compare with the Ford F-150’s other stock sizes?

275/70R18 is 3.8 in shorter: with a speedometer set for 37x12.50R17 it reads 11.6% high, 53.8 mph at an indicated 60. 275/70R18 is 1.2 in shorter: with a speedometer set for 315/70R17 it reads 3.6% high, 57.9 mph at an indicated 60. 275/70R18 is 0.2 in taller: with a speedometer set for 275/60R20 it reads 0.5% low, 60.3 mph at an indicated 60.

What is the next size up from 275/70R18?

265/75R18: about 0.5 in taller and 0.4 in narrower. On a speedometer set for 275/70R18 it reads 1.5% low (60.9 mph at an indicated 60).