275/70R18 in inches

A 275/70R18 tire is 33.2″ tall and 10.8″ wide, and fits a 18″ wheel. In inches it is written 33.2×10.8R18.

Diameter33.16″

Width10.83″

Sidewall7.58″

Drawn to scale. Nominal dimensions calculated from the size code.

Manufacturer data

How tall 275/70R18 tires really are

Heights published by BFGoodrich, General, Michelin, Mickey Thompson and Toyo for all 32 tires in this size. Their published revolutions per mile work out to 32.1–32.7″ under load (below).

Real 275/70R18 tires measure 33.19–33.58″, against 33.16″ from the size code. Every one runs taller than the size code.

Toyo M-5533.58″ +0.43″
Toyo M65533.58″ +0.43″
Toyo Open Country M/T33.57″ +0.41″
Toyo Open Country C/T33.42″ +0.27″
Mickey Thompson Baja Boss A/T33.40″ +0.24″
Mickey Thompson Baja Legend EXP33.40″ +0.24″
Mickey Thompson Baja Legend MTZ33.30″ +0.14″
Toyo Open Country WLT133.27″ +0.11″
BFGoodrich All-Terrain T/A KO333.20″ +0.04″
BFGoodrich HD-Terrain T/A KT33.20″ +0.04″
BFGoodrich Mud-Terrain T/A KM333.20″ +0.04″
General Grabber A/TX · 233.20″ +0.04″
General Grabber APT · 233.20″ +0.04″
General Grabber H/T33.20″ +0.04″
General Grabber HD33.20″ +0.04″
General Grabber X3 · 233.20″ +0.04″
Michelin Agilis CrossClimate 233.20″ +0.04″
Michelin Defender LTX M/S 233.20″ +0.04″
Toyo Open Country A/T III EV · 333.20″ +0.04″
Toyo Open Country R/T Pro33.20″ +0.04″
Michelin LTX A/T2 · 233.19–33.20″ +0.04″
BFGoodrich HD Pro T/A33.19″ +0.03″
Toyo Open Country A/T III · 233.19″ +0.03″
Toyo Open Country R/T Trail33.19″ +0.03″
Toyo Open Country H/T II33.19″ +0.03″

Each bar runs from the size code's 33.16″ (the orange line) to the model's published height. The track spans 1.0″. Where a model comes in several load ranges, the darker part shows its range of heights; the number after the name is how many versions it comes in.

Height under load32.1–32.7″

Published revs per mile (617–628) mean the tire rolls like a 32.1–32.7″ tire on the vehicle. Use this for speedometer calibration.

Weight spread40.3–66.0 lb

The lightest (General Grabber APT, SL) is 25.7 lb lighter per corner than the heaviest (Mickey Thompson Baja Boss A/T, LT E).

32 tires in 275/70R18

Sort by the spec you care about.

	Load					Revs/mi	Source
General Grabber APTAll-terrain	SL · 116S	33.20	40.3	13.0	2,756	627	Spec page
Toyo Open Country A/T III EVAll-terrain	SL · 116T	33.20	44.5	13.5	2,756	626	Spec page
Toyo Open Country A/T III EVAll-terrain	SL · 116T	33.20	44.5	13.5	2,756	626	Spec page
General Grabber A/TXAll-terrain	SL · 116S	33.20	45.5	14.0	2,756	627	Spec page
Michelin Defender LTX M/S 2All-season	LT E · 125S	33.20	50.0	14.0	3,640	627	Spec page
BFGoodrich HD Pro T/ACommercial	LT E · 125/122R	33.19	50.4	13.0	3,640	627	Spec page
General Grabber HDCommercial	LT E · 125S	33.20	50.6	14.0	3,640	627	Spec page
Toyo Open Country A/T IIIAll-terrain	LT E · 125/122S	33.19	51.6	16.4	3,640	626	Spec page
Toyo Open Country WLT1Winter	LT E · 125/122Q	33.27	52.3	16.5	3,640	624	Spec page
Toyo Open Country H/T IIHighway	LT E · 125/122S	33.19	52.8	14.6	3,640	626	Spec page
General Grabber H/THighway	LT E · 125S	33.20	53.1	14.0	3,640	627	Spec page
Toyo Open Country A/T IIIAll-terrain	LT E · 125/122S	33.19	53.1	16.4	3,640	626	Spec page
Toyo Open Country A/T III EVAll-terrain	LT E · 125/122S	33.20	53.4	16.4	3,640	626	Spec page
Michelin LTX A/T2All-terrain	LT E · 125S	33.19	53.5	12.0	3,640	627	Spec page
General Grabber APTAll-terrain	LT E · 125S	33.20	53.7	16.0	3,640	627	Spec page
Michelin LTX A/T2All-terrain	LT E · 125/122R	33.20	54.3	14.5	3,640	628	Spec page
Mickey Thompson Baja Legend EXPAll-terrain	LT E · 125Q	33.40	55.0	18.5	3,640	–	Spec page
Toyo Open Country R/T TrailRugged-terrain	LT E · 125/122Q	33.19	55.1	16.4	3,640	626	Spec page
Michelin Agilis CrossClimate 2Commercial	LT E · 125/122R	33.20	56.7	14.0	3,640	627	Spec page
General Grabber A/TXAll-terrain	LT E · 125R	33.20	56.8	16.0	3,640	627	Spec page
Toyo M655Commercial	LT E · 125/122Q	33.58	59.5	18.5	3,640	619	Spec page
BFGoodrich All-Terrain T/A KO3All-terrain	LT E · 125S	33.20	59.7	16.0	3,640	627	Spec page
Mickey Thompson Baja Legend MTZMud-terrain	LT E · 125P	33.30	60.0	20.0	3,640	–	Spec page
Toyo M-55Commercial	LT E · 125/122Q	33.58	60.2	18.8	3,640	619	Spec page
BFGoodrich HD-Terrain T/A KT	LT E · 125Q	33.20	61.0	18.0	3,640	627	Spec page
Toyo Open Country C/TCommercial	LT E · 125/122Q	33.42	61.8	18.4	3,640	621	Spec page
Toyo Open Country R/T ProRugged-terrain	LT E · 125/122Q	33.20	61.8	17.1	3,640	626	Spec page
General Grabber X3Mud-terrain	LT E · 125Q	33.20	62.3	19.0	3,640	627	Spec page
General Grabber X3Mud-terrain	LT E · 125Q	33.20	62.4	19.0	3,640	627	Spec page
BFGoodrich Mud-Terrain T/A KM3Mud-terrain	LT E · 125Q	33.20	64.2	18.0	3,640	627	Spec page
Toyo Open Country M/TMud-terrain	LT E · 125P	33.57	65.2	19.1	3,640	617	Spec page
Mickey Thompson Baja Boss A/TAll-terrain	LT E · 125Q	33.40	66.0	18.5	3,640	–	Spec page

Is 275/70R18 a 33-inch tire?

≈33″

Yes. The size code works out to 33.16″, and the 32 tires here publish 33.19–33.58″, so people call it a 33.

All 33-inch tire sizes, on every wheel size.

A true 33×12.50R18 is 0.16″ shorter on paper and 1.7″ wider.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

Size	Diameter ″	vs 275/70R18	Difference
305/60R18	32.41	-0.75″	-2.3%
245/75R18	32.47	-0.69″	-2.1%
285/65R18	32.59	-0.57″	-1.7%
265/70R18	32.61	-0.55″	-1.7%
235/80R18	32.80	-0.35″	-1.1%
33×12.50R18	33.00	-0.16″	-0.5%
255/80R17	33.06	-0.09″	-0.3%
325/60R18	33.35	+0.20″	+0.6%
305/65R18	33.61	+0.45″	+1.4%
285/70R18	33.71	+0.55″	+1.7%

How to read 275/70R18

How to read any tire size

How LT275/70R18 125S is printed on the sidewall. It's the most common code among the 32 tires here (6 of them); tires in this size come in other load and speed ratings too.

1LTLight truck

Marks a light truck (LT) tire.

2275Section width

275 mm across the widest point, or 10.83 inches. Every 275 size

370Aspect ratio

A percentage, not a measurement: the sidewall is 70% as tall as the tire is wide, which is 192.5 mm or 7.58 inches.

4RConstruction

Radial construction.

518Wheel diameter

Mounts on a 18-inch wheel. Approved wheel widths run 7.0″ to 9.0″.

6125Load index

Each tire carries up to 3,640 lb (1,650 kg) at its maximum pressure.

7SSpeed rating

Rated for up to 112 mph sustained.

ELoad range

Printed separately as "LOAD RANGE E": a 10-ply rating, inflated up to 80 psi (standard load-range table). The load range E tires here carry up to 3,640 lb each, as published.

Specification	Inches	Metric
Overall diameter	33.16	842 mm
Section width	10.83	275 mm
Sidewall height	7.58	192.5 mm
Circumference	104.2	2,646 mm
Revolutions per mile (calculated, unloaded)	608.3	378 per km
Revolutions per mile (published by manufacturers)	617–628	383–390 per km
Approved wheel width	7.0–9.0	178–229 mm

Speedometer error after switching to 275/70R18

Your actual speed– mph

Questions about 275/70R18

What is 275/70R18 in inches?

33.16 inches tall, 10.83 inches wide, on a 18-inch wheel. Written in inches, that is roughly 33.2×10.8R18.

How much does a 275/70R18 tire weigh?

Between 40.3 lb and 66.0 lb for the 32 tires listed here. The lightest is the General Grabber APT (SL); the heaviest is the Mickey Thompson Baja Boss A/T (LT E).

What wheel width do I need for 275/70R18?

Manufacturers approve 7.0–9.0″ wide wheels for this size.

How many revolutions per mile does a 275/70R18 make?

Published figures run 617–628 revolutions per mile. The calculated figure is 608.3, but manufacturers measure the tire under load, where it rolls on a smaller radius.

What is the difference between P275/70R18 and LT275/70R18?

Passenger tires (4 here) are built for passenger loads, with max loads of 2756 lb. Light-truck tires (28 here) come in heavier load ranges with max loads of 3640 lb, and are usually heavier with deeper tread.

How much taller is 275/70R18 than 33×12.50R18?

0.16 inches taller on paper (33.16″ vs 33.00″), which raises the axle about 0.08″. Your speedometer will read about 0.5% slow.