Sheet TS-255/75R17Rev. Oct 15, 2026United States · Canada

Data sheet TS-255/75R17 · Size

255/75R17 in inches

255/75R17 measures 32.1 in (814 mm) overall by the formula. It has a 10.0 in (255 mm) section width and 629 revolutions per mile (391 per km).

Fig. 1 — Cross-section

D32.1″B7.5″C17″A10.0″
A section width, B sidewall, C rim, D overall diameter. Nominal, on the measuring rim.

Table 1 — Nominal dimensions

255/75R17: nominal dimensions in inches and millimeters
Iteminmm
Overall diameter32.06814
Section width10.04255
Sidewall7.53191.3
Rim17431.8
Circumference100.72,558
Revs per mile · km629391
From the makers’ size tables
Measuring rim7″Kumho LT
Approved rims6.5–8.5″9 LT tires

Table 2 — Measured range

32.00–32.30″overall diameter, 11 tires from 4 makers (math: 32.06″)

41–58 lbweight, 9 LT versions

12.0–19.0/32″new tread depth

2,405 lbmax load per tire, 6 of 9 LT versions list it, as published

9 LT · 2 Pversions in the makers’ tables we read

All 11 tires ↓

Table 3

11 tires in 255/75R17, 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 32.06″. 11 tires from 4 makers measure 32.00″–32.30″. Tallest here: Kumho Road Venture MT71 (mud-terrain), 32.30″. Check the maker’s number before you buy for a tight fit.

Published dimensions for 255/75R17
TireTypeDiameterWidthRims, inWeightTreadMax load
Kumho Road Venture AT52kumhotireusa.com · Oct 15, 2026LT · C 111/108R32.00″10.00″6.5–8.542.3 lb16.0/32″2,405 lb @ 50 psi
Toyo Open Country A/T IIItoyotires.com · Oct 15, 2026LT · C 111/108S32.00″10.00″6.5–8.548.0 lb16.3/32″2,405 lb @ 50 psi
Firestone Winterforce LTfirestonetire.com · Oct 15, 2026LT · C 111R32.05″—6.5–8.542.4 lb17.0/32″—
Nitto Terra Grappler G3nittotire.com · Oct 15, 2026LT · C 111/108S32.05″10.04″6.5–8.547.8 lb15.6/32″2,405 lb @ 50 psi
Firestone Destination X/Tfirestonetire.com · Oct 15, 2026LT · C 111T32.10″—6.5–8.540.8 lb15.0/32″—
Firestone Destination M/T2firestonetire.com · Oct 15, 2026LT · C 111Q32.10″—6.5–8.549.7 lb19.0/32″—
Nitto Trail Grappler M/Tnittotire.com · Oct 15, 2026LT · C 111/108Q32.17″10.28″6.5–8.558.5 lb18.3/32″2,405 lb @ 50 psi
Kumho Road Venture MT71kumhotireusa.com · Oct 15, 2026LT · C 111/108Q32.30″10.00″6.5–8.549.3 lb19.0/32″2,405 lb @ 50 psi
Toyo Open Country M/Ttoyotires.com · Oct 15, 2026LT · C 111/108Q32.30″10.00″6.5–8.557.0 lb18.3/32″2,405 lb @ 50 psi
Kumho Road Venture AT52kumhotireusa.com · Oct 15, 2026SL 115T32.00″10.00″6.5–8.537.1 lb13.5/32″2,679 lb @ 51 psi
Firestone Destination A/T2firestonetire.com · Oct 15, 2026SL 113S32.10″—6.5–8.537.1 lb12.0/32″—

§ 1

Numbers by the formula

By the formula 255/75R17 has an overall diameter of 32.1 in (814 mm). The section width is 10.0 in (255 mm) and the single sidewall height is 7.5 in (191 mm) on a 17 in (432 mm) rim.

Circumference is 100.7 in (2,558 mm) and the nominal revolutions per mile are 629 (391 per km). These are unloaded, nominal numbers; real tires measure slightly differently. See the tire and loading placard on the driver's door jamb for vehicle pressures and limits (49 CFR 571.110).

  • Overall diameter: 32.1 in (814 mm) — by the formula
  • Section width: 10.0 in (255 mm)
  • Sidewall height: 7.5 in (191 mm)
  • Revolutions per mile: 629 (391 per km)

§ 2

Published measurements and models

Tire makers' size tables list 11 tires in 255/75R17 from four brands. The listings include 9 LT versions and 2 P-metric versions with load ranges SL and C. Published overall diameters run 32.0–32.3 in versus 32.06 in by the formula (approximately −0.2% to +0.8%).

Makers publish approved rim widths and maximum loads on the sidewall and in their tables (49 CFR 571.139). Examples from maker tables: Kumho Road Venture AT52 LT — overall diameter 32.0 in, weight 42.3 lbs, tread depth 16/32 in; Toyo Open Country A/T III LT — overall diameter 32.0 in, weight 48 lbs, tread depth 16.3/32 in (Toyo lists 648 revs per mile); Nitto Trail Grappler G3 LT — overall diameter 32.17 in, weight 58.5 lbs, tread depth 18.3/32 in.

  • Maker listings: 11 tires from Kumho, Toyo, Firestone, Nitto (m1)
  • Published weights range 37.1–58.5 lbs; new tread depths 12/32–19/32 in

§ 3

Closest sizes and effects

The neighbor table uses a ±3% overall-diameter window on nearby rims. That ±3% is a tire-shop rule of thumb, not a law. The page lists sizes within this window for quick comparison.

By the math: 255/70R18 is 0.0% so an indicated 60 mph remains 60.0 mph and axle height change is 0.00 in. 275/70R17 is +0.3% so an indicated 60 mph becomes about 60.2 mph and axle height increases by about 0.05 in. Use the comparison tool or the speedometer calculator to model other swaps.

  • Nearest same-diameter neighbors include 255/70R18 and 275/65R18 (0.0%)
  • 275/70R17 is about +0.3% larger — roughly +0.05 in axle height and +0.2 mph at a 60 mph indicated speed

Fig. 2

255/75R17 and the sizes next to it

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

32.1″255/70R1832.1″255/75R1732.1″275/65R18
32.1″255/70R1832.1″255/75R1732.1″275/65R18

Table 4

Compare 255/75R17 with another size

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

Input

1 · This size255/75R17

−1.41% — within the ±3% rule of thumb tire shops use. The speedometer and gearing stay close to stock.

Comparison

265/70R17 is 31.61″ tall, −1.41% against 255/75R17. At 60 mph on the dial you drive 59.2 mph.

255/75R17 vs 265/70R17
Item255/75R17265/70R17Change
Overall diameter32.06″31.61″−0.45″ −1.41%
Section width10.04″10.43″+0.39″
Sidewall7.53″7.30″−0.23″
Circumference100.7″99.3″−1.4″
Revs per mile629638+9
Axle height16.03″15.80″−0.23″

When the odometer counts 1,000 miles, you have driven 985.9 miles.

Engine RPM at the same road speed: +1.4%. Gear ratio calculator

Speedometer

Speedometer reading and true speed
Dial showsTrue speedDifference
30 mph29.6 mph−0.4
45 mph44.4 mph−0.6
60 mph59.2 mph−0.8
70 mph69.0 mph−1.0
80 mph78.9 mph−1.1
32.1″31.6″−0.23″

255/75R17265/70R17

Note 1

P-metric or LT in the same size

Kumho Road Venture AT52 is published in both versions.

Kumho Road Venture AT52, 255/75R17: P and LT
Kumho Road Venture AT52P · 115TLT · C · 111/108R
Overall diameter32.00″32.00″
Max load2,679 lb @ 51 psi2,405 lb @ 50 psi
Weight37.1 lb42.3 lb
Tread depth13.5/32″16.0/32″
Approved rims6.5–8.5″6.5–8.5″

Source: Kumho 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 255/75R17: 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 255/75R17

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

Sizes within 3% of 255/75R17
SizeDiameterWidthvs 255/75R17At 60 mphClearance
255/70R1832.06″10.0″0.0%60.00.00″
275/65R1832.07″10.8″0.0%60.0+0.01″
275/70R1732.16″10.8″+0.3%60.2+0.05″
235/80R1731.80″9.3″−0.8%59.5−0.13″
235/85R1631.73″9.3″−1.0%59.4−0.17″
285/70R1631.71″11.2″−1.1%59.3−0.18″
305/60R1832.41″12.0″+1.1%60.7+0.18″
265/75R1631.65″10.4″−1.3%59.2−0.20″
265/70R1731.61″10.4″−1.4%59.2−0.23″
265/65R1831.56″10.4″−1.5%59.1−0.25″

Q&A

Common questions

How many revolutions per mile does 255/75R17 make?

By the formula 255/75R17 makes 629 revolutions per mile (391 per km).

Are there LT and passenger versions of this size?

Yes. Maker tables list 11 tires: 9 LT versions and 2 P-metric versions, with load ranges SL and C (m1).

Where is a tire's load range shown?

The tire sidewall shows the maximum load rating and, for LT tires, the load range letter (49 CFR 571.139).

Where do I find the vehicle maker's recommended pressure?

The vehicle maker's recommended cold inflation pressures appear on the tire and loading placard on the driver's door jamb (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. Kumho: size table (kumhotireusa.com)checked Oct 15, 2026
  2. Toyo: size table (toyotires.com)checked Oct 15, 2026
  3. Nitto: size table (nittotire.com)checked Oct 15, 2026
  4. Kumho: size table (kumhotireusa.com)checked Oct 15, 2026
  5. Toyo: size table (toyotires.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