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285/40R24 in inches

A 285/40R24 tire is 33.0″ tall and 11.2″ wide, and fits a 24″ wheel. In inches it is written 33.0×11.2R24.

Diameter32.98″
Width11.22″
Sidewall4.49″
285/40R24 drawn to scale: 32.98 inch diameter, 4.49 inch sidewall, 24 inch wheel, 11.22 inch tread width24″ wheel4.49″32.98″ overall11.22″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 285/40R24 tires really are

Heights published by Michelin and Toyo for all 2 tires in this size. Their published revolutions per mile work out to 32.0″ under load (below).

Real 285/40R24 tires measure 32.99–32.99″, against 32.98″ from the size code. They run both taller and shorter than the size code.

Height under load32.0″

Published revs per mile (630) mean the tire rolls like a 32.0″ tire on the vehicle. Use this for speedometer calibration.

Weight spread40.7–43.9 lb

The lightest (Michelin Defender LTX M/S 2, XL) is 3.2 lb lighter per corner than the heaviest (Toyo Proxes ST III, XL).

2 tires in 285/40R24

Sort by the spec you care about.

LoadRevs/miSource
Michelin Defender LTX M/S 2All-seasonXL · 112H32.9940.711.02,469630Spec page
Toyo Proxes ST IIIPerformanceXL · 112V32.9943.910.12,469630Spec page

Is 285/40R24 a 33-inch tire?

≈33″

Yes. The size code works out to 32.98″, and the 2 tires here publish 32.99″, so people call it a 33.

All 33-inch tire sizes, on every wheel size.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 285/40R24Difference
295/30R2430.97-2.01″-6.1%
295/35R2331.13-1.85″-5.6%
285/35R2431.85-1.12″-3.4%
325/35R2331.96-1.02″-3.1%
285/40R2331.98-1.00″-3.0%
295/35R2432.13-0.85″-2.6%
305/35R2432.41-0.57″-1.7%
305/40R2332.61-0.37″-1.1%
275/50R2434.83+1.85″+5.6%
35×15.50R2435.00+2.02″+6.1%

How to read 285/40R24

How to read any tire size

285/40R24 112H as printed on the tire sidewall, with each part numbered285/40R24 112H123456
How 285/40R24 112H is printed on the sidewall. It's the most common code among the 2 tires here (1 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.

424Wheel diameter

Mounts on a 24-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.

6HSpeed rating

Rated for up to 130 mph sustained.

XLExtra load

Printed after the size.

SpecificationInchesMetric
Overall diameter32.98838 mm
Section width11.22285 mm
Sidewall height4.49114.0 mm
Circumference103.62,631 mm
Revolutions per mile (calculated, unloaded)611.6380 per km
Revolutions per mile (published by manufacturers)630391 per km
Approved wheel width9.5–11.0241–279 mm

Speedometer error after switching to 285/40R24

Your actual speed– mph

Questions about 285/40R24

What is 285/40R24 in inches?

32.98 inches tall, 11.22 inches wide, on a 24-inch wheel. Written in inches, that is roughly 33.0×11.2R24.

How much does a 285/40R24 tire weigh?

Between 40.7 lb and 43.9 lb for the 2 tires listed here. The lightest is the Michelin Defender LTX M/S 2 (XL); the heaviest is the Toyo Proxes ST III (XL).

What wheel width do I need for 285/40R24?

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

How many revolutions per mile does a 285/40R24 make?

Published figures run 630 revolutions per mile. The calculated figure is 611.6, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 285/40R24 than 305/35R24?

0.57 inches taller on paper (32.98″ vs 32.41″), which raises the axle about 0.29″. Your speedometer will read about 1.8% slow.