305/70R16 in inches

A 305/70R16 tire is 32.8″ tall and 12.0″ wide, and fits a 16″ wheel. In inches it is written 32.8×12.0R16.

Diameter32.81″

Width12.01″

Sidewall8.41″

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

Manufacturer data

How tall 305/70R16 tires really are

Heights published by BFGoodrich, General, Mickey Thompson and Toyo for all 7 tires in this size. Their published revolutions per mile work out to 31.8–32.1″ under load (below).

Real 305/70R16 tires measure 32.80–33.10″, against 32.81″ from the size code. They run both taller and shorter than the size code.

Mickey Thompson Baja Legend EXP33.10″ +0.29″
Toyo Open Country M/T33.02″ +0.21″
Mickey Thompson Baja Legend MTZ33.00″ +0.19″
Toyo Open Country A/T III32.84″ +0.02″
BFGoodrich All-Terrain T/A KO332.80″ −0.01″
BFGoodrich Mud-Terrain T/A KM332.80″ −0.01″
General Grabber A/TX32.80″ −0.01″

Each bar runs from the size code's 32.81″ (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 load31.8–32.1″

Published revs per mile (628–634) mean the tire rolls like a 31.8–32.1″ tire on the vehicle. Use this for speedometer calibration.

Weight spread58.0–69.8 lb

The lightest (Mickey Thompson Baja Legend EXP, LT E) is 11.8 lb lighter per corner than the heaviest (Toyo Open Country M/T, LT E).

7 tires in 305/70R16

Sort by the spec you care about.

	Load					Revs/mi	Source
Mickey Thompson Baja Legend EXPAll-terrain	LT E · 124Q	33.10	58.0	18.5	3,525	–	Spec page
General Grabber A/TXAll-terrain	LT E · 124R	32.80	60.1	16.0	3,525	633	Spec page
Mickey Thompson Baja Legend MTZMud-terrain	LT E · 124Q	33.00	61.0	19.5	3,525	–	Spec page
BFGoodrich All-Terrain T/A KO3All-terrain	LT E · 124S	32.80	61.7	16.0	3,525	634	Spec page
Toyo Open Country A/T IIIAll-terrain	LT E · 124/121R	32.84	63.4	16.8	3,525	633	Spec page
BFGoodrich Mud-Terrain T/A KM3Mud-terrain	LT E · 124Q	32.80	67.7	18.0	3,525	634	Spec page
Toyo Open Country M/TMud-terrain	LT E · 124P	33.02	69.8	20.0	3,525	628	Spec page

Is 305/70R16 a 33-inch tire?

≈33″

Yes. The size code works out to 32.81″, and the 7 tires here publish 32.80–33.10″, so people call it a 33.

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

A true 33×15.50R16 is 0.19″ taller on paper and 3.5″ wider.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

Size	Diameter ″	vs 305/70R16	Difference
285/70R17	32.71	-0.10″	-0.3%
285/75R16	32.83	+0.02″	+0.1%
33×15.50R16	33.00	+0.19″	+0.6%
33×10.50R15	33.00	+0.19″	+0.6%
33×12.50R15	33.00	+0.19″	+0.6%
33×13.50R15	33.00	+0.19″	+0.6%
33×15.50R15	33.00	+0.19″	+0.6%
33×9.50R15	33.00	+0.19″	+0.6%
255/85R16	33.07	+0.26″	+0.8%
295/75R16	33.42	+0.61″	+1.9%

How to read 305/70R16

How to read any tire size

How LT305/70R16 124Q is printed on the sidewall. It's the most common code among the 7 tires here (3 of them); tires in this size come in other load and speed ratings too.

1LTLight truck

Marks a light truck (LT) tire.

2305Section width

305 mm across the widest point, or 12.01 inches. Every 305 size

370Aspect ratio

A percentage, not a measurement: the sidewall is 70% as tall as the tire is wide, which is 213.5 mm or 8.41 inches.

4RConstruction

Radial construction.

516Wheel diameter

Mounts on a 16-inch wheel. Approved wheel widths run 8.0″ to 10.0″.

6124Load index

Each tire carries up to 3,525 lb (1,600 kg) at its maximum pressure.

7QSpeed rating

Rated for up to 99 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 3,525 lb each, as published.

Specification	Inches	Metric
Overall diameter	32.81	833 mm
Section width	12.01	305 mm
Sidewall height	8.41	213.5 mm
Circumference	103.1	2,618 mm
Revolutions per mile (calculated, unloaded)	614.7	382 per km
Revolutions per mile (published by manufacturers)	628–634	390–394 per km
Approved wheel width	8.0–10.0	203–254 mm

Speedometer error after switching to 305/70R16

Your actual speed– mph

Questions about 305/70R16

What is 305/70R16 in inches?

32.81 inches tall, 12.01 inches wide, on a 16-inch wheel. Written in inches, that is roughly 32.8×12.0R16.

How much does a 305/70R16 tire weigh?

Between 58.0 lb and 69.8 lb for the 7 tires listed here. The lightest is the Mickey Thompson Baja Legend EXP (LT E); the heaviest is the Toyo Open Country M/T (LT E).

What wheel width do I need for 305/70R16?

Manufacturers approve 8.0–10.0″ wide wheels for this size.

How many revolutions per mile does a 305/70R16 make?

Published figures run 628–634 revolutions per mile. The calculated figure is 614.7, but manufacturers measure the tire under load, where it rolls on a smaller radius.