38×15.50R22 in inches

A 38×15.50R22 tire is 38.0″ tall and 15.5″ wide, and fits a 22″ wheel.

Diameter38.00″

Width15.50″

Sidewall8.00″

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

Manufacturer data

How tall 38×15.50R22 tires really are

Heights published by Mickey Thompson and Toyo for all 2 tires in this size. Their published revolutions per mile work out to 36.7″ under load (below).

Real 38×15.50R22 tires measure 37.76–37.80″, against 38.00″ from the size code. Every one runs shorter than the size code.

Mickey Thompson Baja Boss M/T37.80″ −0.20″
Toyo Open Country M/T37.76″ −0.24″

Each bar runs from the size code's 38.00″ (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 load36.7″

Published revs per mile (550) mean the tire rolls like a 36.7″ tire on the vehicle. Use this for speedometer calibration.

Weight spread94.0–99.2 lb

The lightest (Mickey Thompson Baja Boss M/T, LT E) is 5.2 lb lighter per corner than the heaviest (Toyo Open Country M/T, LT E).

2 tires in 38×15.50R22

Sort by the spec you care about.

	Load					Revs/mi	Source
Mickey Thompson Baja Boss M/TMud-terrain	LT E · 128Q	37.80	94.0	21.0	3,970	–	Spec page
Toyo Open Country M/TMud-terrain	LT E · 128Q	37.76	99.2	21.0	3,970	550	Spec page

Is a 38×15.50R22 really 38 inches tall?

37.8″

Shorter. The name says 38″, and the 2 tires here publish 37.76–37.80″.

All 38-inch tire sizes, on every wheel size.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

Size	Diameter ″	vs 38×15.50R22	Difference
37×12.50R22	37.00	-1.00″	-2.6%
37×13.50R22	37.00	-1.00″	-2.6%
40×15.50R22	40.00	+2.00″	+5.3%

How to read 38×15.50R22

How to read any tire size

How 38X15.50R22LT 128Q is printed on the sidewall. It's the most common code among the 2 tires here; tires in this size come in other load and speed ratings too.

138Overall diameter

38 inches tall, measured on the approved wheel. Flotation sizes give every number in inches.

215.50Section width

15.50 inches across the widest point, or 394 mm.

3RConstruction

Radial construction.

422Wheel diameter

Mounts on a 22-inch wheel. Approved wheel widths run 11.0″ to 14.0″.

5LTLight truck

Marks a light truck (LT) tire.

6128Load index

Each tire carries up to 3,970 lb (1,800 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 3,970 lb each, as published.

Specification	Inches	Metric
Overall diameter	38.00	965 mm
Section width	15.50	394 mm
Sidewall height	8.00	203.2 mm
Circumference	119.4	3,032 mm
Revolutions per mile (calculated, unloaded)	530.7	330 per km
Revolutions per mile (published by manufacturers)	550	342 per km
Approved wheel width	11.0–14.0	279–356 mm

Speedometer error after switching to 38×15.50R22

Your actual speed– mph

Questions about 38×15.50R22

What is 38×15.50R22 in inches?

38.00 inches tall, 15.50 inches wide, on a 22-inch wheel. Manufacturers publish 37.76–37.80 inches for the 2 tires listed here.

How much does a 38×15.50R22 tire weigh?

Between 94.0 lb and 99.2 lb for the 2 tires listed here. The lightest is the Mickey Thompson Baja Boss M/T (LT E); the heaviest is the Toyo Open Country M/T (LT E).

What wheel width do I need for 38×15.50R22?

Manufacturers approve 11.0–14.0″ wide wheels for this size.

How many revolutions per mile does a 38×15.50R22 make?

Published figures run 550 revolutions per mile. The calculated figure is 530.7, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 38×15.50R22 than 37×13.50R22?

1.00 inches taller on paper (38.00″ vs 37.00″), which raises the axle about 0.50″. Your speedometer will read about 2.7% slow.