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285/40R19 in inches

A 285/40R19 tire is 28.0″ tall and 11.2″ wide, and fits a 19″ wheel. In inches it is written 28.0×11.2R19.

Diameter27.98″
Width11.22″
Sidewall4.49″
285/40R19 drawn to scale: 27.98 inch diameter, 4.49 inch sidewall, 19 inch wheel, 11.22 inch tread width19″ wheel4.49″27.98″ overall11.22″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 285/40R19 tires really are

Heights published by Michelin and Toyo for all 6 tires in this size. Their published revolutions per mile work out to 27.1–27.3″ under load (below).

Real 285/40R19 tires measure 27.99–28.20″, against 27.98″ from the size code. They run both taller and shorter than the size code.

  1. Michelin Pilot Sport All-Season 428.20″ +0.22″
  2. Michelin Pilot Sport 428.00″ +0.02″
  3. Michelin Pilot Sport 528.00″ +0.02″
  4. Michelin Pilot Super Sport28.00″ +0.02″
  5. Toyo Observe G3-Ice27.99″ +0.02″
  6. Michelin Pilot Alpin PA427.99″ +0.01″
Each bar runs from the size code's 27.98″ (the orange line) to the model's published height. The track spans 1.0″. Where a model comes in several load ranges, the darker part shows its range of heights; the number after the name is how many versions it comes in.
Height under load27.1–27.3″

Published revs per mile (738–743) mean the tire rolls like a 27.1–27.3″ tire on the vehicle. Use this for speedometer calibration.

Weight spread30.1–33.5 lb

The lightest (Michelin Pilot Super Sport, SL) is 3.4 lb lighter per corner than the heaviest (Toyo Observe G3-Ice, SL).

6 tires in 285/40R19

Sort by the spec you care about.

LoadRevs/miSource
Michelin Pilot Super SportPerformanceSL · 103(Y)28.0030.19.01,929743Spec page
Michelin Pilot Sport All-Season 4PerformanceXL · 107Y28.2030.410.02,149738Spec page
Michelin Pilot Sport 5PerformanceXL · 107(Y)28.0030.99.02,149743Spec page
Michelin Pilot Alpin PA4WinterSL · 103V27.9931.310.51,929743Spec page
Michelin Pilot Sport 4PerformanceXL · 107(Y)28.0032.49.52,149743Spec page
Toyo Observe G3-IceWinterSL · 103T27.9933.511.31,929742Spec page

Is 285/40R19 a 28-inch tire?

≈28″

Yes. The size code works out to 27.98″, and the 6 tires here publish 27.99–28.20″, 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 285/40R19Difference
235/45R1927.33-0.65″-2.3%
265/40R1927.35-0.63″-2.3%
355/30R1927.39-0.59″-2.1%
305/35R1927.41-0.57″-2.0%
275/40R1927.66-0.31″-1.1%
245/45R1927.68-0.30″-1.1%
255/45R1928.04+0.06″+0.2%
235/50R1928.25+0.28″+1.0%
295/40R1928.29+0.31″+1.1%
265/45R1928.39+0.41″+1.5%

How to read 285/40R19

How to read any tire size

285/40R19 107Y as printed on the tire sidewall, with each part numbered285/40R19 107Y123456
How 285/40R19 107Y is printed on the sidewall. It's the most common code among the 6 tires here (2 of them); 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

240Aspect ratio

A percentage, not a measurement: the sidewall is 40% as tall as the tire is wide, which is 114.0 mm or 4.49 inches.

3RConstruction

Radial construction.

419Wheel diameter

Mounts on a 19-inch wheel. Approved wheel widths run 9.5″ to 11.0″.

5107Load index

Each tire carries up to 2,149 lb (975 kg) at its maximum pressure.

6YSpeed rating

Rated for up to 186 mph sustained.

XLExtra load

Printed after the size. In this size the XL tires carry up to 2,149 lb each and the standard-load tires up to 1,929 lb, as published.

SpecificationInchesMetric
Overall diameter27.98711 mm
Section width11.22285 mm
Sidewall height4.49114.0 mm
Circumference87.92,232 mm
Revolutions per mile (calculated, unloaded)720.9448 per km
Revolutions per mile (published by manufacturers)738–743459–462 per km
Approved wheel width9.5–11.0241–279 mm

Speedometer error after switching to 285/40R19

Your actual speed– mph

Questions about 285/40R19

What is 285/40R19 in inches?

27.98 inches tall, 11.22 inches wide, on a 19-inch wheel. Written in inches, that is roughly 28.0×11.2R19.

How much does a 285/40R19 tire weigh?

Between 30.1 lb and 33.5 lb for the 6 tires listed here. The lightest is the Michelin Pilot Super Sport (SL); the heaviest is the Toyo Observe G3-Ice (SL).

What wheel width do I need for 285/40R19?

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

How many revolutions per mile does a 285/40R19 make?

Published figures run 738–743 revolutions per mile. The calculated figure is 720.9, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 285/40R19 than 245/45R19?

0.30 inches taller on paper (27.98″ vs 27.68″), which raises the axle about 0.15″. Your speedometer will read about 1.1% slow.