Tire size · 18-inch wheel · about 27.0x10.0R18

255/45R18 tire size

Overall diameter, nominal27.0 in

Estimate ±687 mm

A 255/45R18 tire is 27.0 in (687 mm) tall and 10.0 in (255 mm) wide on a 18-inch wheel, with a 4.5 in sidewall, and turns about 746 times a mile.

Stock on the Toyota Tacoma (2005–2006, 2008 and 2011–2013), per their makers’ documents.

Width: 10.0 in
Sidewall: 4.5 in
Wheel: 18 in
Revs per mile: 746

01 / Dimensions

255/45R18 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.

255/45R18

Estimate ±

Overall diameter: 27.0 in 687 mm26.6 to 27.4 in for real tires
Section width: 10.0 in 255 mm
Sidewall height: 4.5 in 115 mm
Wheel diameter: 18 in 457 mm
Circumference: 84.9 in 2,157 mm
Revolutions per mile: 746 464 per km735 to 757

02 / Stock on

Vehicles that leave the factory on 255/45R18

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 255/45R18 instead.

Toyota TacomaMaker
- 2011–2013 · X-Runnerprinted 255/45R18
- 2008 · X-Runnerprinted P255/45R18
- 2005–2006 · X-Runnerprinted P255/45R18
Toyota Tacoma model years on 255/45R18:
- Toyota Tacoma 2nd gen (2005–2015): specs
Its other stock sizes
- 245/75R16 (2005 and 2011–2013 · Base 4x4, PreRunner). 255/45R18 is 3.4 in shorter: with a speedometer set for 245/75R16 it reads 12.7% high, 53.2 mph at an indicated 60.
- 215/70R15 (2005 and 2011–2013 · Base 2.7L 4-cylinder 4x2). 255/45R18 is 0.2 in taller: with a speedometer set for 215/70R15 it reads 0.7% low, 60.4 mph at an indicated 60.

Documents last checked Oct 9, 2026. 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 255/45R18

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 255/45R18
Size	Tallin	Heightvs 255/45R18	Widthvs 255/45R18	At an indicated 60true mph	Compare
225/55R18	27.7	+0.7 in	−1.2 in	61.660.6 to 62.5	Compare →
245/55R18	28.6	+1.6 in	−0.4 in	63.562.5 to 64.4	Compare →
225/60R18	28.6	+1.6 in	−1.2 in	63.562.6 to 64.5	Compare →

About as tall, other wheels

About as tall, other wheels, compared with 255/45R18
Size	Tallin	Heightvs 255/45R18	Widthvs 255/45R18	At an indicated 60true mph	Compare
215/65R16	27.0	±0.0 in	−1.6 in	59.959.0 to 60.8	Compare →
205/75R15	27.1	+0.1 in	−2.0 in	60.259.3 to 61.1	Compare →
215/70R15	26.9	−0.2 in	−1.6 in	59.658.7 to 60.5	Compare →
195/80R15	27.3	+0.2 in	−2.4 in	60.659.6 to 61.5	Compare →

04 / Next

Compare it with your size

Tire size calculator255/45R18 against 225/55R18, or any two sizes: height, speedometer and gearing.Compare sizes Tire sizes by vehicleEvery stock size on the trucks and SUVs we cover.Browse sizes Toyota Tacoma tiresStock tires and wheels by trim, and what bigger tires change on the Toyota Tacoma.See the tires

05 / FAQ

Questions people ask

What is 255/45R18 in inches?

About 27.0x10.0R18: 27.0 in tall and 10.0 in wide on a 18-inch wheel.

Which vehicles come with 255/45R18 tires?

In our data: Toyota Tacoma (2005–2006, 2008 and 2011–2013).

How does 255/45R18 compare with the Toyota Tacoma’s other stock sizes?

255/45R18 is 3.4 in shorter: with a speedometer set for 245/75R16 it reads 12.7% high, 53.2 mph at an indicated 60. 255/45R18 is 0.2 in taller: with a speedometer set for 215/70R15 it reads 0.7% low, 60.4 mph at an indicated 60.

What is the next size up from 255/45R18?

225/55R18: about 0.7 in taller and 1.2 in narrower. On a speedometer set for 255/45R18 it reads 2.6% low (61.6 mph at an indicated 60).