225/75R17 in inches

A 225/75R17 tire is 30.3″ tall and 8.9″ wide, and fits a 17″ wheel. In inches it is written 30.3×8.9R17.

Diameter30.29″

Width8.86″

Sidewall6.64″

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

Manufacturer data

How tall 225/75R17 tires really are

Heights published by Michelin and Toyo for all 2 tires in this size. Their published revolutions per mile work out to 29.4″ under load (below).

Real 225/75R17 tires measure 30.30–30.31″, against 30.29″ from the size code. They run both taller and shorter than the size code.

Height under load29.4″

Published revs per mile (685–686) mean the tire rolls like a 29.4″ tire on the vehicle. Use this for speedometer calibration.

Weight spread39.8–48.5 lb

The lightest (Michelin Defender LTX M/S, LT E) is 8.7 lb lighter per corner than the heaviest (Toyo Open Country C/T, LT E).

2 tires in 225/75R17

Sort by the spec you care about.

	Load					Revs/mi	Source
Michelin Defender LTX M/SAll-season	LT E · 116/113R	30.30	39.8	13.5	2,755	686	Spec page
Toyo Open Country C/TCommercial	LT E · 116/113Q	30.31	48.5	17.0	2,755	685	Spec page

Is 225/75R17 a 30-inch tire?

≈30″

Yes. The size code works out to 30.29″, and the 2 tires here publish 30.30–30.31″, so people call it a 30.

All 30-inch tire sizes, on every wheel size.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

Size	Diameter ″	vs 225/75R17	Difference
265/60R17	29.52	-0.77″	-2.5%
245/65R17	29.54	-0.75″	-2.5%
235/70R17	29.95	-0.33″	-1.1%
275/60R17	29.99	-0.30″	-1.0%
255/65R17	30.05	-0.24″	-0.8%
245/70R17	30.50	+0.22″	+0.7%
265/65R17	30.56	+0.28″	+0.9%
235/75R17	30.88	+0.59″	+1.9%
255/70R17	31.06	+0.77″	+2.5%
275/65R17	31.07	+0.79″	+2.6%

How to read 225/75R17

How to read any tire size

How LT225/75R17 116/113R is printed on the sidewall. It's the most common code among the 2 tires here (1 of them); tires in this size come in other load and speed ratings too.

1LTLight truck

Marks a light truck (LT) tire.

2225Section width

225 mm across the widest point, or 8.86 inches. Every 225 size

375Aspect ratio

A percentage, not a measurement: the sidewall is 75% as tall as the tire is wide, which is 168.8 mm or 6.64 inches.

4RConstruction

Radial construction.

517Wheel diameter

Mounts on a 17-inch wheel. Approved wheel widths run 6.0″ to 7.5″.

6116/113Load index

Each tire carries up to 2,756 lb (1,250 kg) on its own, or 2,535 lb (1,150 kg) each when paired on a dual rear axle.

7RSpeed rating

Rated for up to 106 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 2,755 lb each, as published.

Specification	Inches	Metric
Overall diameter	30.29	769 mm
Section width	8.86	225 mm
Sidewall height	6.64	168.8 mm
Circumference	95.2	2,417 mm
Revolutions per mile (calculated, unloaded)	665.9	414 per km
Revolutions per mile (published by manufacturers)	685–686	426 per km
Approved wheel width	6.0–7.5	152–191 mm

Speedometer error after switching to 225/75R17

Your actual speed– mph

Questions about 225/75R17

What is 225/75R17 in inches?

30.29 inches tall, 8.86 inches wide, on a 17-inch wheel. Written in inches, that is roughly 30.3×8.9R17.

How much does a 225/75R17 tire weigh?

Between 39.8 lb and 48.5 lb for the 2 tires listed here. The lightest is the Michelin Defender LTX M/S (LT E); the heaviest is the Toyo Open Country C/T (LT E).

What wheel width do I need for 225/75R17?

Manufacturers approve 6.0–7.5″ wide wheels for this size.

How many revolutions per mile does a 225/75R17 make?

Published figures run 685–686 revolutions per mile. The calculated figure is 665.9, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 225/75R17 than 255/65R17?

0.24 inches taller on paper (30.29″ vs 30.05″), which raises the axle about 0.12″. Your speedometer will read about 0.8% slow.