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Tire size · 18-inch wheel · about 34.8x11.2R18

285/75R18 tire size

Overall diameter, nominal34.8 in

Estimate ±885 mm

A 285/75R18 tire is 34.8 in (885 mm) tall and 11.2 in (285 mm) wide on a 18-inch wheel, with a 8.4 in sidewall, and turns about 579 times a mile.

Stock on the Ford Super Duty (2020–2024, with a package), per their makers’ documents.

Width
11.2 in
Sidewall
8.4 in
Wheel
18 in
Revs per mile
579

01 / Dimensions

285/75R18 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.

285/75R18

Estimate ±
Overall diameter
34.8 in 885 mm34.3 to 35.4 in for real tires
Section width
11.2 in 285 mm
Sidewall height
8.4 in 214 mm
Wheel diameter
18 in 457 mm
Circumference
109.4 in 2,779 mm
Revolutions per mile
579 360 per km570 to 588

02 / Stock on

Vehicles that leave the factory on 285/75R18

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 285/75R18 instead.

  • Ford Super DutyMaker
    • 2023–2024 · Series not specified Crew Cab 6.75-ft box 4x4 with the Tremor Off-Road Package (17Y)printed LT285/75R18
    • 2020–2022 · Series not specified Crew Cab 6.75-ft box 7.3L OHV V8/6.7L Power Stroke V8 turbo diesel 4x4 with the Tremor Off-Road Package (17Y)printed LT285/75R18

    Ford Super Duty model years on 285/75R18:

    Its other stock sizes

    • 275/70R18 (2020–2024 · Series not specified F-350 SRW with the 18-in/20-in all-terrain and 20-in all-season tires (F-350 SRW), with a package). 285/75R18 is 1.7 in taller: with a speedometer set for 275/70R18 it reads 4.8% low, 63.0 mph at an indicated 60.
    • 275/65R18 (2020–2024 · Series not specified F-350 SRW with the 18-in wheels and tires (F-350 SRW), with a package). 285/75R18 is 2.8 in taller: with a speedometer set for 275/65R18 it reads 7.9% low, 65.2 mph at an indicated 60.
    • 225/70R19.5 (2020–2024 · Series not specified Regular Cab/Crew Cab 8-ft box F-450). 285/75R18 is 2.9 in taller: with a speedometer set for 225/70R19.5 it reads 8.4% low, 65.5 mph at an indicated 60.
    • 245/75R17 (2020–2024 · Series not specified F-250/F-350 SRW; Series not specified 8-ft box F-350 DRW). 285/75R18 is 3.4 in taller: with a speedometer set for 245/75R17 it reads 9.7% low, 66.4 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 285/75R18

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 285/75R18
SizeTallinHeightvs 285/75R18Widthvs 285/75R18At an indicated 60true mphCompare
35x12.50R1835.0+0.2 in+1.3 in60.359.4 to 61.2Compare →
37x12.50R1837.0+2.2 in+1.3 in63.762.8 to 64.7Compare →

Next sizes down

Next sizes down, compared with 285/75R18
SizeTallinHeightvs 285/75R18Widthvs 285/75R18At an indicated 60true mphCompare
325/65R1834.6−0.2 in+1.6 in59.758.8 to 60.6Compare →
295/70R1834.3−0.6 in+0.4 in59.058.1 to 59.9Compare →

About as tall, other wheels

About as tall, other wheels, compared with 285/75R18
SizeTallinHeightvs 285/75R18Widthvs 285/75R18At an indicated 60true mphCompare
35x12.50R1535.0+0.2 in+1.3 in60.359.4 to 61.2Compare →
35x12.50R1735.0+0.2 in+1.3 in60.359.4 to 61.2Compare →
35x12.50R2035.0+0.2 in+1.3 in60.359.4 to 61.2Compare →
35x12.50R2235.0+0.2 in+1.3 in60.359.4 to 61.2Compare →

04 / Next

Compare it with your size

Tire size calculator285/75R18 against 35x12.50R18, or any two sizes: height, speedometer and gearing.Compare sizesTire sizes by vehicleEvery stock size on the trucks and SUVs we cover.Browse sizesFord Super Duty tiresStock tires and wheels by trim, and what bigger tires change on the Ford Super Duty.See the tires

05 / FAQ

Questions people ask

What is 285/75R18 in inches?

About 34.8x11.2R18: 34.8 in tall and 11.2 in wide on a 18-inch wheel.

Which vehicles come with 285/75R18 tires?

In our data: Ford Super Duty (2020–2024, with a package).

How does 285/75R18 compare with the Ford Super Duty’s other stock sizes?

285/75R18 is 1.7 in taller: with a speedometer set for 275/70R18 it reads 4.8% low, 63.0 mph at an indicated 60. 285/75R18 is 2.8 in taller: with a speedometer set for 275/65R18 it reads 7.9% low, 65.2 mph at an indicated 60. 285/75R18 is 2.9 in taller: with a speedometer set for 225/70R19.5 it reads 8.4% low, 65.5 mph at an indicated 60.

What is the next size up from 285/75R18?

35x12.50R18: about 0.2 in taller and 1.3 in wider. On a speedometer set for 285/75R18 it reads 0.5% low (60.3 mph at an indicated 60).