225/45R15 in inches

A 225/45R15 tire is 23.0″ tall and 8.9″ wide, and fits a 15″ wheel. In inches it is written 23.0×8.9R15.

Diameter22.97″

Width8.86″

Sidewall3.99″

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

Manufacturer data

How tall 225/45R15 tires really are

Heights published by BFGoodrich and Toyo for all 8 tires in this size. Their published revolutions per mile work out to 22.2–22.3″ under load (below).

Real 225/45R15 tires measure 22.90–23.00″, against 22.97″ from the size code. They run both taller and shorter than the size code.

Height under load22.2–22.3″

Published revs per mile (905–908) mean the tire rolls like a 22.2–22.3″ tire on the vehicle. Use this for speedometer calibration.

Weight spread20.5–24.3 lb

The lightest (Toyo Proxes RR, SL) is 3.8 lb lighter per corner than the heaviest (Toyo Proxes R888R, XL).

8 tires in 225/45R15

Sort by the spec you care about.

	Load					Revs/mi	Source
Toyo Proxes RRPerformance	SL	22.95	20.5	3.6	1,201	905	Spec page
Toyo Proxes Sport RPerformance	XL · 87V	23.00	20.5	7.2	1,356	905	Spec page
Toyo Proxes RPerformance	XL · 87W	22.95	20.6	3.6	1,201	905	Spec page
Toyo Proxes R1RPerformance	SL · 87W	22.95	22.1	8.1	1,201	905	Spec page
BFGoodrich g-Force Rival SPerformance	SL · 87V	22.95	22.2	7.2	1,201	906	Spec page
BFGoodrich g-Force Rival+Performance	SL · 87V	22.95	22.2	7.2	1,201	906	Spec page
Toyo Proxes RA1Performance	SL	22.90	23.0	8.0	1,201	908	Spec page
Toyo Proxes R888RPerformance	XL · 91W	22.95	24.3	6.3	1,356	905	Spec page

Is 225/45R15 a 23-inch tire?

≈23″

Yes. The size code works out to 22.97″, and the 8 tires here publish 22.90–23.00″, so people call it a 23.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

Size	Diameter ″	vs 225/45R15	Difference
195/50R15	22.68	-0.30″	-1.3%
245/40R15	22.72	-0.26″	-1.1%
185/60R14	22.74	-0.23″	-1.0%
195/45R16	22.91	-0.06″	-0.3%
175/65R14	22.96	-0.02″	-0.1%
185/55R15	23.01	+0.04″	+0.2%
205/50R15	23.07	+0.10″	+0.4%
195/55R15	23.44	+0.47″	+2.1%
185/60R15	23.74	+0.77″	+3.3%
225/50R15	23.86	+0.89″	+3.9%

How to read 225/45R15

How to read any tire size

How 225/45R15 87V is printed on the sidewall. It's the most common code among the 8 tires here (2 of them); tires in this size come in other load and speed ratings too.

1225Section width

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

245Aspect ratio

A percentage, not a measurement: the sidewall is 45% as tall as the tire is wide, which is 101.3 mm or 3.99 inches.

3RConstruction

Radial construction.

415Wheel diameter

Mounts on a 15-inch wheel. Approved wheel widths run 7.0″ to 8.5″.

587Load index

Each tire carries up to 1,201 lb (545 kg) at its maximum pressure.

6VSpeed rating

Rated for up to 149 mph sustained.

Specification	Inches	Metric
Overall diameter	22.97	584 mm
Section width	8.86	225 mm
Sidewall height	3.99	101.3 mm
Circumference	72.2	1,833 mm
Revolutions per mile (calculated, unloaded)	877.9	546 per km
Revolutions per mile (published by manufacturers)	905–908	562–564 per km
Approved wheel width	7.0–8.5	178–216 mm

Speedometer error after switching to 225/45R15

Your actual speed– mph

Questions about 225/45R15

What is 225/45R15 in inches?

22.97 inches tall, 8.86 inches wide, on a 15-inch wheel. Written in inches, that is roughly 23.0×8.9R15.

How much does a 225/45R15 tire weigh?

Between 20.5 lb and 24.3 lb for the 8 tires listed here. The lightest is the Toyo Proxes RR (SL); the heaviest is the Toyo Proxes R888R (XL).

What wheel width do I need for 225/45R15?

Manufacturers approve 7.0–8.5″ wide wheels for this size.

How many revolutions per mile does a 225/45R15 make?

Published figures run 905–908 revolutions per mile. The calculated figure is 877.9, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 225/45R15 than 245/40R15?

0.26 inches taller on paper (22.97″ vs 22.72″), which raises the axle about 0.13″. Your speedometer will read about 1.1% slow.