Sheet TS-275/55R20Rev. Oct 15, 2026United States · Canada

Data sheet TS-275/55R20 · Size

275/55R20 in inches

275/55R20 measures 31.9 in (811 mm) overall by the formula, with a 10.8 in (275 mm) section width and 632 revs per mile.

Fig. 1 — Cross-section

D31.9″B6.0″C20″A10.8″
A section width, B sidewall, C rim, D overall diameter. Nominal, on the measuring rim.

Table 1 — Nominal dimensions

275/55R20: nominal dimensions in inches and millimeters
Iteminmm
Overall diameter31.91811
Section width10.83275
Sidewall5.95151.3
Rim20508.0
Circumference100.22,546
Revs per mile · km632393
From the makers’ size tables
Flotation size printed32X11.00R20LTMickey Thompson
Measuring rim8.5″Nitto LT
Approved rims8.0–9.5, 7.5–9.5″9 LT tires

Table 2 — Measured range

31.89–32.30″overall diameter, 23 tires from 5 makers (math: 31.91″)

49–64 lbweight, 9 LT versions

10.0–19.1/32″new tread depth

2,680–3,085 lbmax load per tire, 8 of 9 LT versions list it, as published

9 LT · 14 Pversions in the makers’ tables we read

All 23 tires ↓

Table 3

23 tires in 275/55R20, as published

One row per model and type, from each maker’s size table. LT first, then P-metric; sorted by diameter.

The math says 31.91″. 23 tires from 5 makers measure 31.89″–32.30″. Tallest here: Mickey Thompson Baja Legend EXP (all-terrain), 32.30″. Check the maker’s number before you buy for a tight fit.

Published dimensions for 275/55R20
TireTypeDiameterWidthRims, inWeightTreadMax load
Nitto Recon Grappler A/Tnittotire.com · Oct 15, 2026LT · E 120/117S31.89″11.18″8.0–9.553.8 lb15.9/32″3,085 lb @ 80 psi
Nitto Terra Grappler G3nittotire.com · Oct 15, 2026LT · E 120/117T31.89″11.18″8.0–9.552.8 lb15.9/32″3,085 lb @ 80 psi
Firestone Destination X/Tfirestonetire.com · Oct 15, 2026LT · E 120R31.90″—7.5–9.549.1 lb16.0/32″—
Kumho Road Venture AT52kumhotireusa.com · Oct 15, 2026LT · E 120/117S31.90″11.20″8.0–9.552.9 lb16.0/32″3,085 lb @ 80 psi
Toyo Open Country A/T IIItoyotires.com · Oct 15, 2026LT · E 120/117T31.90″11.20″8.0–9.550.0 lb16.4/32″3,085 lb @ 80 psi
Toyo Open Country M/Ttoyotires.com · Oct 15, 2026LT · D 115/112P32.10″11.20″7.5–9.564.0 lb19.1/32″2,680 lb @ 65 psi
Nitto Ridge Grapplernittotire.com · Oct 15, 2026LT · E 120/117Q32.13″11.18″8.0–9.553.1 lb16.4/32″3,085 lb @ 80 psi
Mickey Thompson Baja Boss A/Tmickeythompsontires.com · Oct 15, 2026LT · E 120Q32.20″10.90″7.5–9.563.0 lb18.5/32″3,085 lb @ 80 psi
Mickey Thompson Baja Legend EXPmickeythompsontires.com · Oct 15, 2026LT · E 120Q32.30″10.80″7.5–9.557.0 lb18.5/32″3,085 lb @ 80 psi
Nitto Ridge Grapplernittotire.com · Oct 15, 2026XL 117T31.89″11.18″7.5–9.547.6 lb13.5/32″2,833 lb @ 50 psi
Nitto Recon Grappler A/Tnittotire.com · Oct 15, 2026XL 117T31.89″11.18″7.5–9.544.3 lb13.5/32″2,833 lb @ 50 psi
Nitto Terra Grappler G3nittotire.com · Oct 15, 2026XL 117T31.89″11.18″7.5–9.544.1 lb13.5/32″2,833 lb @ 50 psi
Nitto Dura Grapplernittotire.com · Oct 15, 2026XL 117H31.89″11.34″7.5–9.544.1 lb13.0/32″2,833 lb @ 50 psi
Firestone Destination A/T2firestonetire.com · Oct 15, 2026SL 111S31.90″—7.5–9.544.2 lb12.0/32″—
Firestone Destination LE3firestonetire.com · Oct 15, 2026SL 113H31.90″—7.5–9.538.4 lb10.0/32″—
Firestone Destination LE4firestonetire.com · Oct 15, 2026SL 113H31.90″—7.5–9.539.9 lb12.0/32″—
Kumho Road Venture AT52kumhotireusa.com · Oct 15, 2026SL 113T31.90″11.20″7.5–9.544.0 lb13.5/32″2,535 lb @ 51 psi
Kumho Road Venture RTkumhotireusa.com · Oct 15, 2026XL 117T31.90″11.20″7.5–9.545.8 lb13.5/32″2,833 lb @ 50 psi
Kumho Crugen HT51kumhotireusa.com · Oct 15, 2026SL 111T31.90″11.20″7.5–9.540.9 lb12.0/32″2,403 lb @ 51 psi
Toyo Open Country A/T IIItoyotires.com · Oct 15, 2026XL 117T31.90″11.20″7.5–9.542.0 lb13.5/32″2,833 lb @ 50 psi
Toyo Open Country R/T Trailtoyotires.com · Oct 15, 2026XL 117T31.90″11.20″7.5–9.543.0 lb13.5/32″2,833 lb @ 50 psi
Toyo Open Country H/T IItoyotires.com · Oct 15, 2026XL 117H31.90″11.20″7.5–9.543.0 lb11.2/32″2,833 lb @ 50 psi
Mickey Thompson Baja Boss A/Tmickeythompsontires.com · Oct 15, 2026XL 117T32.20″11.10″7.5–9.548.0 lb16.0/32″2,833 lb @ 50 psi

§ 1

Nominal measurements

By the formula 275/55R20 is 31.9 in (811 mm) overall. The section width is 10.8 in (275 mm). The rim is 20 in (508 mm).

Sidewall height by the formula is 6.0 in (151 mm). Circumference is 100.2 in (2,546 mm). Revolutions per mile are 632 (393 per km). These are unloaded nominal numbers from the size math.

§ 2

What makers publish

Tire makers' size tables list 23 tires in 275/55R20 from 5 brands, with 9 LT and 14 P-metric or passenger versions. Load ranges shown include SL, XL, D and E.

Published overall diameters run from 31.89 in to 32.3 in against 31.91 in by the formula (−0.1% to +1.2%). Weights in the tables run from 38.4 lbs to 64 lbs. New tread depths run from 10/32 in to 19.1/32 in.

  • Nitto Recon Grappler A/T LT275/55R20 — overall diameter 31.89 in; weight 53.8 lbs; tread depth 15.9/32 in.
  • Toyo Open Country A/T III LT275/55R20 — overall diameter 31.9 in; weight 50 lbs; tread depth 16.4/32 in; maker lists 651 revs per mile.
  • Mickey Thompson Baja Legend EXP LT275/55R20 — overall diameter 32.3 in; weight 57 lbs; tread depth 18.5/32 in.

§ 3

Closest alternative sizes

The nearest sizes within a ±3% diameter window include 275/50R21, 305/50R20 and 245/60R20 among others. The ±3% window is a tire-shop rule of thumb, not a law.

Small diameter changes alter indicated speed, axle clearance and revs per mile. Use the comparison tool or the speedometer calculator to see exact effects for your wheel and vehicle.

  • 275/50R21 — diameter −0.3% (−0.08 in, −2 mm); at an indicated 60 mph the true speed is 59.8 mph; axle ground clearance −0.04 in (−1 mm); revs per mile 632 → 634.
  • 305/50R20 — diameter +0.3% (+0.10 in, +3 mm); at an indicated 60 mph the true speed is 60.2 mph; axle ground clearance +0.05 in (+1 mm); revs per mile 632 → 630.

Fig. 2

275/55R20 and the sizes next to it

To scale, on one ground line. Diameter by the formula.

31.8″275/50R2131.9″275/55R2032.0″305/50R20
31.8″275/50R2131.9″275/55R2032.0″305/50R20

Table 4

Compare 275/55R20 with another size

Type any size: diameter, sidewall, speedometer and clearance change against this one.

Input

1 · This size275/55R20

+3.39% — outside the ±3% rule of thumb tire shops use. Expect a speedometer error, and check clearance at full lock and full compression before you buy.

Comparison

275/60R20 is 32.99″ tall, +3.39% against 275/55R20. At 60 mph on the dial you drive 62.0 mph.

275/55R20 vs 275/60R20
Item275/55R20275/60R20Change
Overall diameter31.91″32.99″+1.08″ +3.39%
Section width10.83″10.83″0.00″
Sidewall5.95″6.50″+0.54″
Circumference100.2″103.6″+3.4″
Revs per mile632611−21
Axle height15.95″16.50″+0.54″

When the odometer counts 1,000 miles, you have driven 1,033.9 miles.

Engine RPM at the same road speed: −3.3%. Gear ratio calculator

Speedometer

Speedometer reading and true speed
Dial showsTrue speedDifference
30 mph31.0 mph+1.0
45 mph46.5 mph+1.5
60 mph62.0 mph+2.0
70 mph72.4 mph+2.4
80 mph82.7 mph+2.7
31.9″33.0″+0.54″

275/55R20275/60R20

Note 1

P-metric or LT in the same size

Nitto Recon Grappler A/T is published in both versions.

Nitto Recon Grappler A/T, 275/55R20: P and LT
Nitto Recon Grappler A/TP · 117TLT · E · 120/117S
Overall diameter31.89″31.89″
Max load2,833 lb @ 50 psi3,085 lb @ 80 psi
Weight44.3 lb53.8 lb
Tread depth13.5/32″15.9/32″
Approved rims7.5–9.5″8.0–9.5″

Source: Nitto size table, checked Oct 15, 2026. On trucks and SUVs, the load ratings of the tires on an axle must add up to at least the axle’s GAWR on the certification label (49 CFR 571.110).

Vehicles on 275/55R20: not listed yet. We add a vehicle here only from its maker’s own spec sheet for that year and trim.

The size your vehicle left the factory on is printed on the tire and loading placard on the driver’s door jamb (49 CFR 571.110). Pressure and load: that placard too.

Table 5

Within 3% of 275/55R20

Same rim or ±1″, diameter within 3%. A shop rule of thumb, not a law.

Sizes within 3% of 275/55R20
SizeDiameterWidthvs 275/55R20At 60 mphClearance
275/50R2131.83″10.8″−0.3%59.8−0.04″
305/50R2032.01″12.0″+0.3%60.2+0.05″
245/60R2031.57″9.6″−1.0%59.4−0.17″
285/55R2032.34″11.2″+1.4%60.8+0.22″
265/60R2032.52″10.4″+1.9%61.1+0.31″
285/50R2031.22″11.2″−2.2%58.7−0.34″
255/60R1931.05″10.0″−2.7%58.4−0.43″
295/55R2032.78″11.6″+2.7%61.6+0.43″
255/55R2031.04″10.0″−2.7%58.4−0.43″

Q&A

Common questions

How many revolutions per mile does 275/55R20 make?

By the formula 275/55R20 makes 632 revolutions per mile (393 per km).

Do makers offer LT and passenger versions of 275/55R20?

Yes. Makers' tables list 23 tires in 275/55R20 from 5 brands with 9 LT and 14 P-metric or passenger versions, and load ranges SL, XL, D and E.

How much do published diameters vary between brands?

Published overall diameters run from 31.89 in to 32.3 in versus 31.91 in by the formula, a spread of about −0.1% to +1.2%.

Where do I find the vehicle maker's inflation and load info?

See the tire and loading placard on the driver's door jamb; the placard lists the manufacturer's recommended cold inflation pressures and related info (49 CFR 571.110).

Notes

Method and sources

Each number and rule comes from a source with the date it was checked.

  1. Sidewall = width × aspect ratio ÷ 100
  2. Diameter = rim × 25.4 + 2 × sidewall (mm)
  3. Revs per mile = 63,360 ÷ (π × diameter, in)
  4. True speed = dial × new diameter ÷ old diameter
  5. Clearance change = half the diameter change

Numbers are nominal: the tire unloaded, on its measuring rim. Revs per mile published by makers run higher than the formula. “Within 3%” is a rule of thumb tire shops use, not a law. Tire pressure: the placard on your door jamb.

  1. Nitto: size table (nittotire.com)checked Oct 15, 2026
  2. Toyo: size table (toyotires.com)checked Oct 15, 2026
  3. Mickey Thompson: size table (mickeythompsontires.com)checked Oct 15, 2026
  4. Toyo: size table (toyotires.com)checked Oct 15, 2026
  5. Mickey Thompson: size table (mickeythompsontires.com)checked Oct 15, 2026
  6. 49 CFR 571.139 (FMVSS No. 139), S5.5(d)ecfr.gov · checked Oct 15, 2026
  7. 49 CFR 571.110 (FMVSS No. 110), S4.3ecfr.gov · checked Oct 15, 2026

Related

Calculators and size classes

33″22 metric and 11 flotation sizes measure 32.5–33.5″ by the formula305/70R16 · 285/75R16 · 295/75R16 · 305/65R17 · 285/70R1735″15 metric and 16 flotation sizes measure 34.5–35.5″ by the formula315/75R16 · 325/65R18 · 305/70R18 · 285/75R18 · 285/65R2037″3 metric and 13 flotation sizes measure 36.5–37.5″ by the formula385/70R16 · 315/80R17 · 375/45R24