295/45R18 in inches

A 295/45R18 tire is 28.5″ tall and 11.6″ wide, and fits a 18″ wheel. In inches it is written 28.5×11.6R18.

Diameter28.45″

Width11.61″

Sidewall5.23″

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

Manufacturer data

How tall 295/45R18 tires really are

Heights published by Toyo for the one tire in this size. Their published revolutions per mile work out to 27.6″ under load (below).

The one tire listed, the Toyo Proxes ST III, measures 28.46″: 0.01″ taller than the size code's 28.45″.

Height under load27.6″

Published revs per mile (730) mean the tire rolls like a 27.6″ tire on the vehicle. Use this for speedometer calibration.

1 tire in 295/45R18

Sort by the spec you care about.

	Load					Revs/mi	Source
Toyo Proxes ST IIIPerformance	XL · 112V	28.46	35.1	10.1	2,469	730	Spec page

Is 295/45R18 a 28-inch tire?

≈28″

Close. The size code works out to 28.45″, and the 1 tire here publishes 28.46″, 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.

Size	Diameter ″	vs 295/45R18	Difference
245/50R18	27.65	-0.81″	-2.8%
225/55R18	27.74	-0.71″	-2.5%
235/55R18	28.18	-0.28″	-1.0%
265/45R19	28.39	-0.06″	-0.2%
225/65R17	28.52	+0.06″	+0.2%
245/60R17	28.57	+0.12″	+0.4%
245/55R18	28.61	+0.16″	+0.6%
225/60R18	28.63	+0.18″	+0.6%
255/55R18	29.04	+0.59″	+2.1%
235/60R18	29.10	+0.65″	+2.3%

How to read 295/45R18

How to read any tire size

How 295/45R18 112V 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.

1295Section width

295 mm across the widest point, or 11.61 inches. Every 295 size

245Aspect ratio

A percentage, not a measurement: the sidewall is 45% as tall as the tire is wide, which is 132.8 mm or 5.23 inches.

3RConstruction

Radial construction.

418Wheel diameter

Mounts on a 18-inch wheel. Approved wheel widths run 9.5″ to 11.0″.

5112Load index

Each tire carries up to 2,469 lb (1,120 kg) at its maximum pressure.

6VSpeed rating

Rated for up to 149 mph sustained.

XLExtra load

Printed after the size.

Specification	Inches	Metric
Overall diameter	28.45	723 mm
Section width	11.61	295 mm
Sidewall height	5.23	132.8 mm
Circumference	89.4	2,270 mm
Revolutions per mile (calculated, unloaded)	708.8	440 per km
Revolutions per mile (published by manufacturers)	730	454 per km
Approved wheel width	9.5–11.0	241–279 mm

Speedometer error after switching to 295/45R18

Your actual speed– mph

Questions about 295/45R18

What is 295/45R18 in inches?

28.45 inches tall, 11.61 inches wide, on a 18-inch wheel. Written in inches, that is roughly 28.5×11.6R18.

What wheel width do I need for 295/45R18?

Manufacturers approve 9.5–11.0″ wide wheels for this size.

How many revolutions per mile does a 295/45R18 make?

Published figures run 730 revolutions per mile. The calculated figure is 708.8, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 295/45R18 than 235/55R18?

0.28 inches taller on paper (28.45″ vs 28.18″), which raises the axle about 0.14″. Your speedometer will read about 1.0% slow.