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Tire size · 18-inch wheel · about 27.7x8.9R18

225/55R18 tire size

Overall diameter, nominal27.7 in

Estimate ±705 mm

A 225/55R18 tire is 27.7 in (705 mm) tall and 8.9 in (225 mm) wide on a 18-inch wheel, with a 4.9 in sidewall, and turns about 727 times a mile.

Stock on the Subaru Crosstrek (2022–2027) and Subaru Forester (2023–2027), per their makers’ documents.

Width
8.9 in
Sidewall
4.9 in
Wheel
18 in
Revs per mile
727

01 / Dimensions

225/55R18 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.

225/55R18

Estimate ±
Overall diameter
27.7 in 705 mm27.3 to 28.2 in for real tires
Section width
8.9 in 225 mm
Sidewall height
4.9 in 124 mm
Wheel diameter
18 in 457 mm
Circumference
87.2 in 2,214 mm
Revolutions per mile
727 452 per km716 to 738

02 / Stock on

Vehicles that leave the factory on 225/55R18

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 225/55R18 instead.

  • Subaru CrosstrekMaker
    • 2027 · Limited, Sport Hybrid, Limited Hybridprinted 225/55R18
    • 2026 · Sport, Limited, Sport Hybrid, Limited Hybridprinted 225/55R18
    • 2024–2025 · Sport, Limitedprinted 225/55R18
    • 2022–2023 · Limited, Hybridprinted 225/55R18

    Subaru Crosstrek model years on 225/55R18:

    Its other stock sizes

    • 225/60R17 (2022–2027 · Base, Premium; Wilderness). 225/55R18 is 0.1 in taller: with a speedometer set for 225/60R17 it reads 0.4% low, 60.2 mph at an indicated 60.
    • 225/55R17 (2026 · Wilderness). 225/55R18 is 1.0 in taller: with a speedometer set for 225/55R17 it reads 3.6% low, 62.2 mph at an indicated 60.
  • Subaru ForesterMaker
    • 2025–2027 · Limitedprinted 225/55R18
    • 2023–2024 · Sport, Limited, Touringprinted 225/55R18

    Subaru Forester model years on 225/55R18:

    Its other stock sizes

    • 235/50R19 (2025–2026 · Sport; Touring). 225/55R18 is 0.5 in shorter: with a speedometer set for 235/50R19 it reads 1.8% high, 58.9 mph at an indicated 60.
    • 235/60R17 (2026–2027 · Wilderness). 225/55R18 is 0.4 in shorter: with a speedometer set for 235/60R17 it reads 1.3% high, 59.2 mph at an indicated 60.
    • 225/60R17 (2023–2027 · Base, Premium). 225/55R18 is 0.1 in taller: with a speedometer set for 225/60R17 it reads 0.4% low, 60.2 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 225/55R18

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 225/55R18
SizeTallinHeightvs 225/55R18Widthvs 225/55R18At an indicated 60true mphCompare
245/55R1828.6+0.9 in+0.8 in61.960.9 to 62.8Compare →
225/60R1828.6+0.9 in±0.0 in61.961.0 to 62.8Compare →
235/60R1829.1+1.4 in+0.4 in62.962.0 to 63.9Compare →

Next sizes down

Next sizes down, compared with 225/55R18
SizeTallinHeightvs 225/55R18Widthvs 225/55R18At an indicated 60true mphCompare
255/45R1827.0−0.7 in+1.2 in58.557.6 to 59.3Compare →

About as tall, other wheels

About as tall, other wheels, compared with 225/55R18
SizeTallinHeightvs 225/55R18Widthvs 225/55R18At an indicated 60true mphCompare
215/75R1527.7±0.0 in−0.4 in59.959.0 to 60.8Compare →
215/70R1627.9+0.1 in−0.4 in60.259.3 to 61.1Compare →
225/60R1727.6−0.1 in±0.0 in59.858.9 to 60.6Compare →
235/60R1728.1+0.4 in+0.4 in60.859.9 to 61.7Compare →

04 / Next

Compare it with your size

Tire size calculator225/55R18 against 245/55R18, or any two sizes: height, speedometer and gearing.Compare sizesTire sizes by vehicleEvery stock size on the trucks and SUVs we cover.Browse sizesSubaru Crosstrek tiresStock tires and wheels by trim, and what bigger tires change on the Subaru Crosstrek.See the tiresSubaru Forester tiresStock tires and wheels by trim, and what bigger tires change on the Subaru Forester.See the tires

05 / FAQ

Questions people ask

What is 225/55R18 in inches?

About 27.7x8.9R18: 27.7 in tall and 8.9 in wide on a 18-inch wheel.

Which vehicles come with 225/55R18 tires?

In our data: Subaru Crosstrek (2022–2027) and Subaru Forester (2023–2027).

How does 225/55R18 compare with the Subaru Forester’s other stock sizes?

225/55R18 is 0.5 in shorter: with a speedometer set for 235/50R19 it reads 1.8% high, 58.9 mph at an indicated 60. 225/55R18 is 0.4 in shorter: with a speedometer set for 235/60R17 it reads 1.3% high, 59.2 mph at an indicated 60. 225/55R18 is 0.1 in taller: with a speedometer set for 225/60R17 it reads 0.4% low, 60.2 mph at an indicated 60.

What is the next size up from 225/55R18?

245/55R18: about 0.9 in taller and 0.8 in wider. On a speedometer set for 225/55R18 it reads 3.0% low (61.9 mph at an indicated 60).