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285/45R19 in inches

A 285/45R19 tire is 29.1″ tall and 11.2″ wide, and fits a 19″ wheel. In inches it is written 29.1×11.2R19.

Diameter29.10″
Width11.22″
Sidewall5.05″
285/45R19 drawn to scale: 29.10 inch diameter, 5.05 inch sidewall, 19 inch wheel, 11.22 inch tread width19″ wheel5.05″29.10″ overall11.22″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 285/45R19 tires really are

Heights published by Toyo for the one tire in this size. Their published revolutions per mile work out to 28.2″ under load (below).

The one tire listed, the Toyo Observe G3-Ice, measures 29.09″: 0.00″ shorter than the size code's 29.10″.

Height under load28.2″

Published revs per mile (714) mean the tire rolls like a 28.2″ tire on the vehicle. Use this for speedometer calibration.

1 tire in 285/45R19

Sort by the spec you care about.

LoadRevs/miSource
Toyo Observe G3-IceWinterXL · 111T29.0935.312.02,403714Spec page

Is 285/45R19 a 29-inch tire?

≈29″

Yes. The size code works out to 29.10″, and the 1 tire here publishes 29.09″, so people call it a 29.

All 29-inch tire sizes, on every wheel size.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 285/45R19Difference
265/45R1928.39-0.71″-2.4%
245/50R1928.65-0.45″-1.6%
225/55R1928.74-0.35″-1.2%
275/45R1928.74-0.35″-1.2%
255/50R1929.04-0.06″-0.2%
235/60R1829.10+0.00″+0.0%
235/55R1929.18+0.08″+0.3%
265/50R1929.43+0.33″+1.2%
245/55R1929.61+0.51″+1.8%
275/50R1929.83+0.73″+2.5%

How to read 285/45R19

How to read any tire size

285/45R19 111T as printed on the tire sidewall, with each part numbered285/45R19 111T123456
How 285/45R19 111T 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.
1285Section width

285 mm across the widest point, or 11.22 inches. Every 285 size

245Aspect ratio

A percentage, not a measurement: the sidewall is 45% as tall as the tire is wide, which is 128.3 mm or 5.05 inches.

3RConstruction

Radial construction.

419Wheel diameter

Mounts on a 19-inch wheel. Approved wheel widths run 9.0″ to 10.5″.

5111Load index

Each tire carries up to 2,403 lb (1,090 kg) at its maximum pressure.

6TSpeed rating

Rated for up to 118 mph sustained.

XLExtra load

Printed after the size.

SpecificationInchesMetric
Overall diameter29.10739 mm
Section width11.22285 mm
Sidewall height5.05128.3 mm
Circumference91.42,322 mm
Revolutions per mile (calculated, unloaded)693.1431 per km
Revolutions per mile (published by manufacturers)714444 per km
Approved wheel width9.0–10.5229–267 mm

Speedometer error after switching to 285/45R19

Your actual speed– mph

Questions about 285/45R19

What is 285/45R19 in inches?

29.10 inches tall, 11.22 inches wide, on a 19-inch wheel. Written in inches, that is roughly 29.1×11.2R19.

What wheel width do I need for 285/45R19?

Manufacturers approve 9.0–10.5″ wide wheels for this size.

How many revolutions per mile does a 285/45R19 make?

Published figures run 714 revolutions per mile. The calculated figure is 693.1, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 285/45R19 than 255/50R19?

0.06 inches taller on paper (29.10″ vs 29.04″), which raises the axle about 0.03″. Your speedometer will read about 0.2% slow.