tireheight.com

225/75R15 in inches

A 225/75R15 tire is 28.3″ tall and 8.9″ wide, and fits a 15″ wheel. In inches it is written 28.3×8.9R15.

Diameter28.29″
Width8.86″
Sidewall6.64″
225/75R15 drawn to scale: 28.29 inch diameter, 6.64 inch sidewall, 15 inch wheel, 8.86 inch tread width15″ wheel6.64″28.29″ overall8.86″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 225/75R15 tires really are

Heights published by Toyo for all 2 tires in this size. Their published revolutions per mile work out to 27.5″ under load (below).

Real 225/75R15 tires measure 28.31″, against 28.29″ from the size code. They run both taller and shorter than the size code.

Height under load27.5″

Published revs per mile (734) mean the tire rolls like a 27.5″ tire on the vehicle. Use this for speedometer calibration.

Weight spread28.5–30.5 lb

The lightest (Toyo Open Country A/T III, SL) is 2.0 lb lighter per corner than the heaviest (Toyo Extensa A/S II, SL).

2 tires in 225/75R15

Sort by the spec you care about.

LoadRevs/miSource
Toyo Open Country A/T IIIAll-terrainSL · 102T28.3128.512.81,874734Spec page
Toyo Extensa A/S IIAll-seasonSL · 102T28.3130.511.51,874734Spec page

Is 225/75R15 a 28-inch tire?

≈28″

Yes. The size code works out to 28.29″, and the 2 tires here publish 28.31″, so people call it a 28.

All 28-inch tire sizes, on every wheel size.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 225/75R15Difference
225/70R1527.40-0.89″-3.1%
215/75R1527.70-0.59″-2.1%
235/70R1527.95-0.33″-1.2%
275/60R1527.99-0.30″-1.0%
28×10.00R1428.00-0.29″-1.0%
235/65R1628.03-0.26″-0.9%
205/75R1628.11-0.18″-0.6%
225/70R1628.40+0.11″+0.4%
235/75R1528.88+0.59″+2.1%
255/70R1529.06+0.77″+2.7%

How to read 225/75R15

How to read any tire size

P225/75R15 102T as printed on the tire sidewall, with each part numberedP225/75R15 102T1234567
How P225/75R15 102T 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.
1PP-metric

Marks a P-metric (passenger) tire. Sizes with no letter are Euro-metric.

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.

515Wheel diameter

Mounts on a 15-inch wheel. Approved wheel widths run 6.0″ to 7.5″.

6102Load index

Each tire carries up to 1,874 lb (850 kg) at its maximum pressure.

7TSpeed rating

Rated for up to 118 mph sustained.

SpecificationInchesMetric
Overall diameter28.29718 mm
Section width8.86225 mm
Sidewall height6.64168.8 mm
Circumference88.92,257 mm
Revolutions per mile (calculated, unloaded)713.0443 per km
Revolutions per mile (published by manufacturers)734456 per km
Approved wheel width6.0–7.5152–191 mm

Speedometer error after switching to 225/75R15

Your actual speed– mph

Questions about 225/75R15

What is 225/75R15 in inches?

28.29 inches tall, 8.86 inches wide, on a 15-inch wheel. Written in inches, that is roughly 28.3×8.9R15.

How much does a 225/75R15 tire weigh?

Between 28.5 lb and 30.5 lb for the 2 tires listed here. The lightest is the Toyo Open Country A/T III (SL); the heaviest is the Toyo Extensa A/S II (SL).

What wheel width do I need for 225/75R15?

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

How many revolutions per mile does a 225/75R15 make?

Published figures run 734 revolutions per mile. The calculated figure is 713.0, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 225/75R15 than 275/60R15?

0.30 inches taller on paper (28.29″ vs 27.99″), which raises the axle about 0.15″. Your speedometer will read about 1.1% slow.