245/30R19 in inches

A 245/30R19 tire is 24.8″ tall and 9.6″ wide, and fits a 19″ wheel. In inches it is written 24.8×9.6R19.

Diameter24.79″

Width9.65″

Sidewall2.89″

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

Manufacturer data

How tall 245/30R19 tires really are

Heights published by Michelin for the one tire in this size. Their published revolutions per mile work out to 24.1″ under load (below).

The one tire listed, the Michelin Pilot Sport 4 S, measures 24.80″: 0.01″ taller than the size code's 24.79″.

Height under load24.1″

Published revs per mile (837) mean the tire rolls like a 24.1″ tire on the vehicle. Use this for speedometer calibration.

1 tire in 245/30R19

Sort by the spec you care about.

	Load					Revs/mi	Source
Michelin Pilot Sport 4 SPerformance	XL · 89(Y)	24.80	21.2	9.5	1,279	837	Spec page

Is 245/30R19 a 25-inch tire?

≈25″

Yes. The size code works out to 24.79″, and the 1 tire here publishes 24.80″, so people call it a 25.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

Size	Diameter ″	vs 245/30R19	Difference
285/30R18	24.73	-0.06″	-0.2%
245/35R18	24.75	-0.04″	-0.1%
215/40R18	24.77	-0.02″	-0.1%
295/30R18	24.97	+0.18″	+0.7%
255/30R19	25.02	+0.24″	+1.0%
225/35R19	25.20	+0.41″	+1.7%
265/30R19	25.26	+0.47″	+1.9%
235/35R19	25.48	+0.69″	+2.8%
275/30R19	25.50	+0.71″	+2.9%
285/30R19	25.73	+0.94″	+3.8%

How to read 245/30R19

How to read any tire size

How 245/30R19 89Y 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.

1245Section width

245 mm across the widest point, or 9.65 inches. Every 245 size

230Aspect ratio

A percentage, not a measurement: the sidewall is 30% as tall as the tire is wide, which is 73.5 mm or 2.89 inches.

3RConstruction

Radial construction.

419Wheel diameter

Mounts on a 19-inch wheel. Approved wheel widths run 8.0″ to 9.0″.

589Load index

Each tire carries up to 1,279 lb (580 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	24.79	630 mm
Section width	9.65	245 mm
Sidewall height	2.89	73.5 mm
Circumference	77.9	1,978 mm
Revolutions per mile (calculated, unloaded)	813.6	506 per km
Revolutions per mile (published by manufacturers)	837	520 per km
Approved wheel width	8.0–9.0	203–229 mm

Speedometer error after switching to 245/30R19

Your actual speed– mph

Questions about 245/30R19

What is 245/30R19 in inches?

24.79 inches tall, 9.65 inches wide, on a 19-inch wheel. Written in inches, that is roughly 24.8×9.6R19.

What wheel width do I need for 245/30R19?

Manufacturers approve 8.0–9.0″ wide wheels for this size.

How many revolutions per mile does a 245/30R19 make?

Published figures run 837 revolutions per mile. The calculated figure is 813.6, but manufacturers measure the tire under load, where it rolls on a smaller radius.