325/35R22 in inches

A 325/35R22 tire is 31.0″ tall and 12.8″ wide, and fits a 22″ wheel. In inches it is written 31.0×12.8R22.

Diameter30.96″

Width12.80″

Sidewall4.48″

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

Manufacturer data

How tall 325/35R22 tires really are

Heights published by Michelin for the one tire in this size. Their published revolutions per mile work out to 30.1″ under load (below).

The one tire listed, the Michelin Pilot Sport 4 S, measures 31.00″: 0.04″ taller than the size code's 30.96″.

Height under load30.1″

Published revs per mile (671) mean the tire rolls like a 30.1″ tire on the vehicle. Use this for speedometer calibration.

1 tire in 325/35R22

Sort by the spec you care about.

	Load					Revs/mi	Source
Michelin Pilot Sport 4 SPerformance	XL · 114(Y)	31.00	37.7	9.0	2,601	671	Spec page

Is 325/35R22 a 31-inch tire?

≈31″

Yes. The size code works out to 30.96″, and the 1 tire here publishes 31.00″, so people call it a 31.

All 31-inch tire sizes, on every wheel size.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

Size	Diameter ″	vs 325/35R22	Difference
265/40R22	30.35	-0.61″	-2.0%
305/35R22	30.41	-0.55″	-1.8%
275/40R22	30.66	-0.30″	-1.0%
315/35R22	30.68	-0.28″	-0.9%
315/40R21	30.92	-0.04″	-0.1%
285/40R22	30.98	+0.02″	+0.1%
255/45R22	31.04	+0.08″	+0.3%
295/40R22	31.29	+0.33″	+1.1%
305/40R22	31.61	+0.65″	+2.1%
275/45R22	31.74	+0.79″	+2.5%

How to read 325/35R22

How to read any tire size

How 325/35R22 114Y 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.

1325Section width

325 mm across the widest point, or 12.80 inches. Every 325 size

235Aspect ratio

A percentage, not a measurement: the sidewall is 35% as tall as the tire is wide, which is 113.8 mm or 4.48 inches.

3RConstruction

Radial construction.

422Wheel diameter

Mounts on a 22-inch wheel. Approved wheel widths run 11.0″ to 13.0″.

5114Load index

Each tire carries up to 2,601 lb (1,180 kg) at its maximum pressure.

6YSpeed rating

Rated for up to 186 mph sustained.

XLExtra load

Printed after the size.

Specification	Inches	Metric
Overall diameter	30.96	786 mm
Section width	12.80	325 mm
Sidewall height	4.48	113.8 mm
Circumference	97.3	2,470 mm
Revolutions per mile (calculated, unloaded)	651.5	405 per km
Revolutions per mile (published by manufacturers)	671	417 per km
Approved wheel width	11.0–13.0	279–330 mm

Speedometer error after switching to 325/35R22

Your actual speed– mph

Questions about 325/35R22

What is 325/35R22 in inches?

30.96 inches tall, 12.80 inches wide, on a 22-inch wheel. Written in inches, that is roughly 31.0×12.8R22.

What wheel width do I need for 325/35R22?

Manufacturers approve 11.0–13.0″ wide wheels for this size.

How many revolutions per mile does a 325/35R22 make?

Published figures run 671 revolutions per mile. The calculated figure is 651.5, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 325/35R22 than 315/35R22?

0.28 inches taller on paper (30.96″ vs 30.68″), which raises the axle about 0.14″. Your speedometer will read about 0.9% slow.