Data sheet TS-265/65R18 · Size

265/65R18 in inches

By the formula 265/65R18 is 31.6 in (802 mm) overall diameter. Section width 10.4 in (265 mm); sidewall 6.8 in (172 mm).

Fig. 1 — Cross-section

A section width, B sidewall, C rim, D overall diameter. Nominal, on the measuring rim.

Table 1 — Nominal dimensions

265/65R18: nominal dimensions in inches and millimeters
Item	in	mm
Overall diameter	31.56	802
Section width	10.43	265
Sidewall	6.78	172.3
Rim	18	457.2
Circumference	99.2	2,519
Revs per mile · km	639	397

From the makers’ size tables
Flotation size printed	32X10.50R18	Mickey Thompson
Measuring rim	8″	Toyo LT
Approved rims	8.0–9.5, 7.5–9.5″	5 LT tires

Table 2 — Measured range

31.50–31.77″overall diameter, 17 tires from 5 makers (math: 31.56″)

46–55 lbweight, 5 LT versions

10.0–16.4/32″new tread depth

3,305 lbmax load per tire, 4 of 5 LT versions list it, as published

5 LT · 12 Pversions in the makers’ tables we read

All 17 tires ↓

Table 3

17 tires in 265/65R18, 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 31.56″. 17 tires from 5 makers measure 31.50″–31.77″. Tallest here: Nitto Ridge Grappler (hybrid terrain), 31.77″. Check the maker’s number before you buy for a tight fit.

Published dimensions for 265/65R18
Tire	Type	Diameter	Width	Rims, in	Weight	Tread	Max load
Toyo Open Country A/T IIItoyotires.com · Oct 15, 2026	LT · E 122/119S	31.50″	10.70″	8.0–9.5	49.0 lb	16.3/32″	3,305 lb @ 80 psi
Toyo Open Country R/Ttoyotires.com · Oct 15, 2026	LT · E 122/119Q	31.50″	10.70″	8.0–9.5	55.0 lb	16.4/32″	3,305 lb @ 80 psi
Nitto Terra Grappler G3nittotire.com · Oct 15, 2026	LT · E 122/119R	31.54″	10.71″	8.0–9.5	49.2 lb	15.7/32″	3,305 lb @ 80 psi
Firestone Destination X/Tfirestonetire.com · Oct 15, 2026	LT · E 122S	31.56″	—	7.5–9.5	46.1 lb	12.0/32″	—
Nitto Ridge Grapplernittotire.com · Oct 15, 2026	LT · E 122/119Q	31.77″	10.71″	8.0–9.5	52.8 lb	16.4/32″	3,305 lb @ 80 psi
Firestone Destination A/T2firestonetire.com · Oct 15, 2026	SL 112S	31.50″	—	7.5–9.5	39.4 lb	12.0/32″	—
Firestone Destination LE3firestonetire.com · Oct 15, 2026	SL 114T	31.50″	—	7.5–9.5	37.4 lb	10.0/32″	—
Firestone Destination LE4firestonetire.com · Oct 15, 2026	SL 114T	31.50″	—	7.5–9.5	38.5 lb	12.0/32″	—
Kumho Road Venture AT52kumhotireusa.com · Oct 15, 2026	SL 114T	31.50″	10.70″	7.5–9.5	41.0 lb	13.5/32″	2,601 lb @ 51 psi
Kumho Road Venture RTkumhotireusa.com · Oct 15, 2026	XL 116T	31.50″	10.70″	7.5–9.5	44.3 lb	13.5/32″	2,756 lb @ 50 psi
Mickey Thompson Baja Boss A/Tmickeythompsontires.com · Oct 15, 2026	XL 116T	31.50″	10.70″	7.5–9.5	45.0 lb	16.0/32″	2,756 lb @ 50 psi
Toyo Open Country A/T IIItoyotires.com · Oct 15, 2026	SL 114T	31.50″	10.70″	7.5–9.5	39.0 lb	13.3/32″	2,601 lb @ 44 psi
Toyo Open Country R/Ttoyotires.com · Oct 15, 2026	SL 114T	31.50″	10.70″	7.5–9.5	43.0 lb	13.5/32″	2,601 lb @ 44 psi
Toyo Open Country H/T IItoyotires.com · Oct 15, 2026	SL 114T	31.50″	10.70″	7.5–9.5	39.0 lb	12.0/32″	2,601 lb @ 44 psi
Nitto Ridge Grapplernittotire.com · Oct 15, 2026	XL 116T	31.54″	10.71″	7.5–9.5	43.1 lb	13.5/32″	2,756 lb @ 50 psi
Nitto Terra Grappler G3nittotire.com · Oct 15, 2026	XL 116T	31.54″	10.71″	7.5–9.5	41.7 lb	13.4/32″	2,756 lb @ 50 psi
Kumho Crugen HT51kumhotireusa.com · Oct 15, 2026	SL 112T	31.60″	9.30″	6.0–7.5	37.2 lb	12.5/32″	2,469 lb @ 51 psi

§ 1

What the size measures

By the formula 265/65R18 measures 31.6 in (802 mm) overall diameter. Rim diameter 18 in (457 mm). Sidewall height 6.8 in (172 mm). Section width 10.4 in (265 mm).

Circumference 99.2 in (2,519 mm). Revolutions per mile 639 (397 per km). These are unloaded nominal numbers calculated by the standard size formula; see the cross-section drawing and the nominal size table for the size.

§ 2

What makers publish

Tire makers' tables list 17 tires in 265/65R18 from 5 brands. Makers list 5 LT versions and 12 P-metric (passenger) versions. Load ranges shown include SL, XL and E. Published overall diameters run from 31.5 in to 31.77 in against 31.56 in by the formula (−0.2% to +0.7%). Weights run from 37.2 lbs to 55 lbs. New tread depths run from 10/32 in to 16.4/32 in.

Examples from maker tables: Toyo lists the Open Country A/T III LT265/65R18 at 31.5 in overall diameter, weight 49 lbs and tread depth 16.3/32 in (load range E). Nitto lists the Ridge Grappler LT265/65R18 at 31.77 in overall diameter, weight 52.8 lbs and tread depth 16.4/32 in (load range E). Kumho lists the Road Venture AT52 265/65R18 at 31.5 in overall diameter, weight 41 lbs and tread depth 13.5/32 in (load range SL).

§ 3

Nearby sizes and effects

The neighbor table uses a ±3% overall-diameter window. The ±3% window is a tire-shop rule of thumb, not a law. Closest sizes on 17–19 in rims include 265/70R17 (31.6 in, +0.1%), 245/75R17 (31.5 in, −0.3%) and 285/60R18 (31.5 in, −0.3%). See the comparison tool to run other matches.

From 265/65R18 to 265/70R17 the diameter changes +0.1% (+0.04 in, +1 mm); at an indicated 60 mph the true speed is 60.1 mph and revolutions per mile change 639 → 638. From 265/65R18 to 245/75R17 the diameter changes −0.3% (−0.09 in, −2 mm); at an indicated 60 mph the true speed is 59.8 mph and revolutions per mile change 639 → 641. Use the speedometer calculator to check other speed effects and compare sizes.

Closest neighbors within ±3%: 265/70R17; 245/75R17; 285/60R18.
Speedometer and clearance changes above are by diameter change only.

Fig. 2

265/65R18 and the sizes next to it

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

Table 4

Compare 265/65R18 with another size

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

Comparison

265/60R18 is 30.52″ tall, −3.31% against 265/65R18. At 60 mph on the dial you drive 58.0 mph.

265/65R18 vs 265/60R18
Item	265/65R18	265/60R18	Change
Overall diameter	31.56″	30.52″	−1.04″ −3.31%
Section width	10.43″	10.43″	0.00″
Sidewall	6.78″	6.26″	−0.52″
Circumference	99.2″	95.9″	−3.3″
Revs per mile	639	661	+22
Axle height	15.78″	15.26″	−0.52″

When the odometer counts 1,000 miles, you have driven 966.9 miles.

Engine RPM at the same road speed: +3.4%. Gear ratio calculator

Speedometer

Speedometer reading and true speed
Dial shows	True speed	Difference
30 mph	29.0 mph	−1.0
45 mph	43.5 mph	−1.5
60 mph	58.0 mph	−2.0
70 mph	67.7 mph	−2.3
80 mph	77.4 mph	−2.6

265/65R18265/60R18

Note 1

P-metric or LT in the same size

Toyo Open Country A/T III is published in both versions.

Toyo Open Country A/T III, 265/65R18: P and LT
Toyo Open Country A/T III	P · 114T	LT · E · 122/119S
Overall diameter	31.50″	31.50″
Max load	2,601 lb @ 44 psi	3,305 lb @ 80 psi
Weight	39.0 lb	49.0 lb
Tread depth	13.3/32″	16.3/32″
Approved rims	7.5–9.5″	8.0–9.5″

Source: Toyo 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 265/65R18: 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 265/65R18

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

Sizes within 3% of 265/65R18
Size	Diameter	Width	vs 265/65R18	At 60 mph	Clearance
265/70R17	31.61″	10.4″	+0.1%	60.1	+0.02″
245/75R17	31.47″	9.6″	−0.3%	59.8	−0.05″
285/60R18	31.46″	11.2″	−0.3%	59.8	−0.05″
235/80R17	31.80″	9.3″	+0.8%	60.5	+0.12″
255/70R18	32.06″	10.0″	+1.6%	60.9	+0.25″
255/75R17	32.06″	10.0″	+1.6%	60.9	+0.25″
255/70R17	31.06″	10.0″	−1.6%	59.0	−0.25″
255/65R18	31.05″	10.0″	−1.6%	59.0	−0.26″
275/65R18	32.07″	10.8″	+1.6%	61.0	+0.26″
255/60R19	31.05″	10.0″	−1.6%	59.0	−0.26″

Other 18″ sizes

Q&A

Common questions

How many revolutions per mile does 265/65R18 make?

By the formula 265/65R18 makes 639 revolutions per mile (397 per km).

Are there LT and P versions of 265/65R18?

Yes. Makers list 17 tires in 265/65R18 from 5 brands: 5 LT versions and 12 P-metric versions. Load ranges shown include SL, XL and E.

Where does the vehicle maker list tire pressure and load?

See the tire and loading placard on the driver's door jamb for the vehicle maker's recommended cold inflation pressures and load guidance (49 CFR 571.110). The tire sidewall shows the maximum load rating and, for LT tires, the load range letter (49 CFR 571.139).

What do the numbers 265/65R18 mean?

265 is the section width in millimeters. 65 is the aspect ratio (sidewall height as a percentage of section width). R18 is the rim diameter in inches. The nominal sidewall and overall diameter follow the standard size formula used for tire sizing.

Notes

Method and sources

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

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

Toyo: size table (toyotires.com)checked Oct 15, 2026
Firestone: size table (firestonetire.com)checked Oct 15, 2026
Kumho: size table (kumhotireusa.com)checked Oct 15, 2026
Mickey Thompson: size table (mickeythompsontires.com)checked Oct 15, 2026
Nitto: size table (nittotire.com)checked Oct 15, 2026
49 CFR 571.139 (FMVSS No. 139), S5.5(d)ecfr.gov · checked Oct 15, 2026
49 CFR 571.110 (FMVSS No. 110), S4.3ecfr.gov · checked Oct 15, 2026

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 · 285/70R17 35″15 metric and 16 flotation sizes measure 34.5–35.5″ by the formula315/75R16 · 325/65R18 · 305/70R18 · 285/75R18 · 285/65R20 37″3 metric and 13 flotation sizes measure 36.5–37.5″ by the formula385/70R16 · 315/80R17 · 375/45R24