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Tire size · 20-inch wheel · about 32.0x12.0R20

305/50R20 tire size

Overall diameter, nominal32.0 in

Estimate ±813 mm

A 305/50R20 tire is 32.0 in (813 mm) tall and 12.0 in (305 mm) wide on a 20-inch wheel, with a 6.0 in sidewall, and turns about 630 times a mile.

Stock on the Ram 1500 (2027, with a package), per their makers’ documents.

Width
12.0 in
Sidewall
6.0 in
Wheel
20 in
Revs per mile
630

01 / Dimensions

305/50R20 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.

305/50R20

Estimate ±
Overall diameter
32.0 in 813 mm31.5 to 32.5 in for real tires
Section width
12.0 in 305 mm
Sidewall height
6.0 in 153 mm
Wheel diameter
20 in 508 mm
Circumference
100.6 in 2,554 mm
Revolutions per mile
630 392 per km621 to 640

02 / Stock on

Vehicles that leave the factory on 305/50R20

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 305/50R20 instead.

  • Ram 1500Maker
    • 2027 · Trim not specified with the Tire option 305/50R20 (late availability)printed 305/50R20

    Ram 1500 model years on 305/50R20:

    Its other stock sizes

    • 325/65R18 (2027 · RHO, TRX SRT). 305/50R20 is 2.6 in shorter: with a speedometer set for 325/65R18 it reads 8.2% high, 55.5 mph at an indicated 60.
    • 325/40R22 (2027 · Trim not specified with the Air suspension, with a package). 305/50R20 is 0.2 in shorter: with a speedometer set for 325/40R22 it reads 0.7% high, 59.6 mph at an indicated 60.
    • 285/45R22 (2027 · Trim not specified). 305/50R20 is 0.1 in shorter: with a speedometer set for 285/45R22 it reads 0.3% high, 59.8 mph at an indicated 60.
    • 275/65R18 (2027 · Tradesman, Big Horn / Lone Star with the Tire option 275/65R18, with a package). 305/50R20 is 0.1 in shorter: with a speedometer set for 275/65R18 it reads 0.2% high, 59.9 mph at an indicated 60.
    • 275/55R20 (2027 · Tradesman, Limited; Big Horn / Lone Star, Laramie with the Tire option 275/55R20). 305/50R20 is 0.1 in taller: with a speedometer set for 275/55R20 it reads 0.3% 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 305/50R20

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 305/50R20
SizeTallinHeightvs 305/50R20Widthvs 305/50R20At an indicated 60true mphCompare
265/60R2032.5+0.5 in−1.6 in61.060.0 to 61.9Compare →
275/60R2033.0+1.0 in−1.2 in61.860.9 to 62.8Compare →
285/60R2033.5+1.5 in−0.8 in62.761.8 to 63.7Compare →

Next sizes down

Next sizes down, compared with 305/50R20
SizeTallinHeightvs 305/50R20Widthvs 305/50R20At an indicated 60true mphCompare
275/55R2031.9−0.1 in−1.2 in59.858.9 to 60.7Compare →
245/60R2031.6−0.4 in−2.4 in59.258.3 to 60.1Compare →

About as tall, other wheels

About as tall, other wheels, compared with 305/50R20
SizeTallinHeightvs 305/50R20Widthvs 305/50R20At an indicated 60true mphCompare
255/65R1932.1±0.0 in−2.0 in60.159.2 to 61.0Compare →
255/70R1832.1±0.0 in−2.0 in60.159.2 to 61.0Compare →
255/75R1732.1+0.1 in−2.0 in60.159.2 to 61.0Compare →
275/65R1832.1+0.1 in−1.2 in60.159.2 to 61.0Compare →

04 / Next

Compare it with your size

Tire size calculator305/50R20 against 265/60R20, or any two sizes: height, speedometer and gearing.Compare sizesTire sizes by vehicleEvery stock size on the trucks and SUVs we cover.Browse sizesRam 1500 tiresStock tires and wheels by trim, and what bigger tires change on the Ram 1500.See the tires

05 / FAQ

Questions people ask

What is 305/50R20 in inches?

About 32.0x12.0R20: 32.0 in tall and 12.0 in wide on a 20-inch wheel.

Which vehicles come with 305/50R20 tires?

In our data: Ram 1500 (2027, with a package).

How does 305/50R20 compare with the Ram 1500’s other stock sizes?

305/50R20 is 2.6 in shorter: with a speedometer set for 325/65R18 it reads 8.2% high, 55.5 mph at an indicated 60. 305/50R20 is 0.2 in shorter: with a speedometer set for 325/40R22 it reads 0.7% high, 59.6 mph at an indicated 60. 305/50R20 is 0.1 in shorter: with a speedometer set for 285/45R22 it reads 0.3% high, 59.8 mph at an indicated 60.

What is the next size up from 305/50R20?

265/60R20: about 0.5 in taller and 1.6 in narrower. On a speedometer set for 305/50R20 it reads 1.6% low (61.0 mph at an indicated 60).