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Tire size · 20-inch wheel · about 33.5x11.2R20

285/60R20 tire size

Overall diameter, nominal33.5 in

Estimate ±850 mm

A 285/60R20 tire is 33.5 in (850 mm) tall and 11.2 in (285 mm) wide on a 20-inch wheel, with a 6.7 in sidewall, and turns about 603 times a mile.

Stock on the Ram 2500 (2026, with a package), per their makers’ documents.

Width
11.2 in
Sidewall
6.7 in
Wheel
20 in
Revs per mile
603

01 / Dimensions

285/60R20 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.

285/60R20

Estimate ±
Overall diameter
33.5 in 850 mm33.0 to 34.0 in for real tires
Section width
11.2 in 285 mm
Sidewall height
6.7 in 171 mm
Wheel diameter
20 in 508 mm
Circumference
105.1 in 2,670 mm
Revolutions per mile
603 374 per km594 to 612

02 / Stock on

Vehicles that leave the factory on 285/60R20

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 285/60R20 instead.

  • Ram 2500Maker
    • 2026 · Tradesman, Big Horn, Laramie, Limited, Power Wagon with the Tire option LT285/60R20Eprinted LT285/60R20E

    Ram 2500 model years on 285/60R20:

    Its other stock sizes

    • 275/70R18 (2026 · Tradesman, Big Horn, Laramie, Limited with the Tire option LT275/70R18E, with a package). 285/60R20 is 0.3 in taller: with a speedometer set for 275/70R18 it reads 0.9% low, 60.6 mph at an indicated 60.
    • 285/70R17 (2026 · Tradesman 4x4, Power Wagon with the Tire option LT285/70R17D, with a package). 285/60R20 is 0.8 in taller: with a speedometer set for 285/70R17 it reads 2.3% low, 61.4 mph at an indicated 60.
    • 245/70R17 (2026 · Tradesman with the Tire option LT245/70R17E, with a package). 285/60R20 is 3.0 in taller: with a speedometer set for 245/70R17 it reads 8.8% low, 65.8 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 285/60R20

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 285/60R20
SizeTallinHeightvs 285/60R20Widthvs 285/60R20At an indicated 60true mphCompare
275/65R2034.1+0.6 in−0.4 in61.160.2 to 62.0Compare →
35x12.50R2035.0+1.5 in+1.3 in62.861.8 to 63.7Compare →
37x12.50R2037.0+3.5 in+1.3 in66.365.3 to 67.3Compare →

Next sizes down

Next sizes down, compared with 285/60R20
SizeTallinHeightvs 285/60R20Widthvs 285/60R20At an indicated 60true mphCompare
275/60R2033.0−0.5 in−0.4 in59.258.3 to 60.0Compare →
265/60R2032.5−0.9 in−0.8 in58.357.4 to 59.2Compare →

About as tall, other wheels

About as tall, other wheels, compared with 285/60R20
SizeTallinHeightvs 285/60R20Widthvs 285/60R20At an indicated 60true mphCompare
265/75R1833.6+0.2 in−0.8 in60.359.4 to 61.2Compare →
275/70R1833.2−0.3 in−0.4 in59.458.6 to 60.3Compare →
285/75R1733.8+0.4 in±0.0 in60.759.7 to 61.6Compare →

04 / Next

Compare it with your size

Tire size calculator285/60R20 against 275/65R20, or any two sizes: height, speedometer and gearing.Compare sizesTire sizes by vehicleEvery stock size on the trucks and SUVs we cover.Browse sizesRam 2500 tiresStock tires and wheels by trim, and what bigger tires change on the Ram 2500.See the tires

05 / FAQ

Questions people ask

What is 285/60R20 in inches?

About 33.5x11.2R20: 33.5 in tall and 11.2 in wide on a 20-inch wheel.

Which vehicles come with 285/60R20 tires?

In our data: Ram 2500 (2026, with a package).

How does 285/60R20 compare with the Ram 2500’s other stock sizes?

285/60R20 is 0.3 in taller: with a speedometer set for 275/70R18 it reads 0.9% low, 60.6 mph at an indicated 60. 285/60R20 is 0.8 in taller: with a speedometer set for 285/70R17 it reads 2.3% low, 61.4 mph at an indicated 60. 285/60R20 is 3.0 in taller: with a speedometer set for 245/70R17 it reads 8.8% low, 65.8 mph at an indicated 60.

What is the next size up from 285/60R20?

275/65R20: about 0.6 in taller and 0.4 in narrower. On a speedometer set for 285/60R20 it reads 1.8% low (61.1 mph at an indicated 60).