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Tire size · 18-inch wheel · about 28.6x9.6R18

245/55R18 tire size

Overall diameter, nominal28.6 in

Estimate ±727 mm

A 245/55R18 tire is 28.6 in (727 mm) tall and 9.6 in (245 mm) wide on a 18-inch wheel, with a 5.3 in sidewall, and turns about 705 times a mile.

Stock on the Ford Explorer (2014–2018), per their makers’ documents.

Width
9.6 in
Sidewall
5.3 in
Wheel
18 in
Revs per mile
705

01 / Dimensions

245/55R18 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.

245/55R18

Estimate ±
Overall diameter
28.6 in 727 mm28.2 to 29.0 in for real tires
Section width
9.6 in 245 mm
Sidewall height
5.3 in 135 mm
Wheel diameter
18 in 457 mm
Circumference
89.9 in 2,283 mm
Revolutions per mile
705 438 per km695 to 716

02 / Stock on

Vehicles that leave the factory on 245/55R18

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 245/55R18 instead.

  • Ford ExplorerMaker
    • 2014–2018 · Police Interceptor Utilityprinted 245/55R18

    Ford Explorer model years on 245/55R18:

    Its other stock sizes

    • 255/50R20 (2016–2018 · Sport). 245/55R18 is 1.4 in shorter: with a speedometer set for 255/50R20 it reads 5.0% high, 57.1 mph at an indicated 60.
    • 245/60R18 (2017–2018 · XLT). 245/55R18 is 1.0 in shorter: with a speedometer set for 245/60R18 it reads 3.4% high, 58.0 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 245/55R18

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 245/55R18
SizeTallinHeightvs 245/55R18Widthvs 245/55R18At an indicated 60true mphCompare
235/60R1829.1+0.5 in−0.4 in61.060.1 to 61.9Compare →
245/60R1829.6+1.0 in±0.0 in62.061.1 to 63.0Compare →
235/65R1830.0+1.4 in−0.4 in63.062.0 to 63.9Compare →

Next sizes down

Next sizes down, compared with 245/55R18
SizeTallinHeightvs 245/55R18Widthvs 245/55R18At an indicated 60true mphCompare
225/55R1827.7−0.9 in−0.8 in58.257.3 to 59.1Compare →
255/45R1827.0−1.6 in+0.4 in56.755.8 to 57.5Compare →

About as tall, other wheels

About as tall, other wheels, compared with 245/55R18
SizeTallinHeightvs 245/55R18Widthvs 245/55R18At an indicated 60true mphCompare
225/65R1728.5−0.1 in−0.8 in59.858.9 to 60.7Compare →
225/55R1928.7+0.1 in−0.8 in60.359.4 to 61.2Compare →
225/70R1628.4−0.2 in−0.8 in59.658.7 to 60.5Compare →
235/75R1528.9+0.3 in−0.4 in60.659.7 to 61.5Compare →

04 / Next

Compare it with your size

Tire size calculator245/55R18 against 235/60R18, 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 tires

05 / FAQ

Questions people ask

What is 245/55R18 in inches?

About 28.6x9.6R18: 28.6 in tall and 9.6 in wide on a 18-inch wheel.

Which vehicles come with 245/55R18 tires?

In our data: Ford Explorer (2014–2018).

How does 245/55R18 compare with the Ford Explorer’s other stock sizes?

245/55R18 is 1.4 in shorter: with a speedometer set for 255/50R20 it reads 5.0% high, 57.1 mph at an indicated 60. 245/55R18 is 1.0 in shorter: with a speedometer set for 245/60R18 it reads 3.4% high, 58.0 mph at an indicated 60.

What is the next size up from 245/55R18?

235/60R18: about 0.5 in taller and 0.4 in narrower. On a speedometer set for 245/55R18 it reads 1.7% low (61.0 mph at an indicated 60).