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355/40R22 in inches

A 355/40R22 tire is 33.2″ tall and 14.0″ wide, and fits a 22″ wheel. In inches it is written 33.2×14.0R22.

Diameter33.18″
Width13.98″
Sidewall5.59″
355/40R22 drawn to scale: 33.18 inch diameter, 5.59 inch sidewall, 22 inch wheel, 13.98 inch tread width22″ wheel5.59″33.18″ overall13.98″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 355/40R22 tires really are

Heights published by Toyo for the one tire in this size. Their published revolutions per mile work out to 32.2″ under load (below).

The one tire listed, the Toyo Open Country R/T Pro, measures 33.20″: 0.02″ taller than the size code's 33.18″.

Height under load32.2″

Published revs per mile (626) mean the tire rolls like a 32.2″ tire on the vehicle. Use this for speedometer calibration.

1 tire in 355/40R22

Sort by the spec you care about.

LoadRevs/miSource
Toyo Open Country R/T ProRugged-terrainLT F · 122Q33.2071.617.13,305626Spec page

Is 355/40R22 a 33-inch tire?

≈33″

Yes. The size code works out to 33.18″, and the 1 tire here publishes 33.20″, so people call it a 33.

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

A true 33×12.50R22 is 0.18″ shorter on paper and 1.5″ narrower.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 355/40R22Difference
285/45R2232.10-1.08″-3.3%
325/40R2232.24-0.94″-2.8%
265/50R2232.43-0.75″-2.3%
305/45R2232.81-0.37″-1.1%
275/50R2232.83-0.35″-1.1%
275/55R2132.91-0.27″-0.8%
33×12.50R2233.00-0.18″-0.5%
285/50R2233.22+0.04″+0.1%
295/50R2233.61+0.43″+1.3%
305/50R2234.01+0.83″+2.5%

How to read 355/40R22

How to read any tire size

LT355/40R22 122Q as printed on the tire sidewall, with each part numberedLT355/40R22 122Q1234567
How LT355/40R22 122Q is printed on the sidewall. It's the most common code among the 1 tire here; tires in this size come in other load and speed ratings too.
1LTLight truck

Marks a light truck (LT) tire.

2355Section width

355 mm across the widest point, or 13.98 inches. Every 355 size

340Aspect ratio

A percentage, not a measurement: the sidewall is 40% as tall as the tire is wide, which is 142.0 mm or 5.59 inches.

4RConstruction

Radial construction.

522Wheel diameter

Mounts on a 22-inch wheel. Approved wheel widths run 12.0″ to 14.0″.

6122Load index

Each tire carries up to 3,305 lb (1,500 kg) at its maximum pressure.

7QSpeed rating

Rated for up to 99 mph sustained.

FLoad range

Printed separately as "LOAD RANGE F": a 12-ply rating, inflated up to 95 psi (standard load-range table). The load range F tires here carry up to 3,305 lb each, as published.

SpecificationInchesMetric
Overall diameter33.18843 mm
Section width13.98355 mm
Sidewall height5.59142.0 mm
Circumference104.22,648 mm
Revolutions per mile (calculated, unloaded)607.8378 per km
Revolutions per mile (published by manufacturers)626389 per km
Approved wheel width12.0–14.0305–356 mm

Speedometer error after switching to 355/40R22

Your actual speed– mph

Questions about 355/40R22

What is 355/40R22 in inches?

33.18 inches tall, 13.98 inches wide, on a 22-inch wheel. Written in inches, that is roughly 33.2×14.0R22.

What wheel width do I need for 355/40R22?

Manufacturers approve 12.0–14.0″ wide wheels for this size.

How many revolutions per mile does a 355/40R22 make?

Published figures run 626 revolutions per mile. The calculated figure is 607.8, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 355/40R22 than 33×12.50R22?

0.18 inches taller on paper (33.18″ vs 33.00″), which raises the axle about 0.09″. Your speedometer will read about 0.5% slow.