tireheight.com

285/35R24 in inches

A 285/35R24 tire is 31.9″ tall and 11.2″ wide, and fits a 24″ wheel. In inches it is written 31.9×11.2R24.

Diameter31.85″
Width11.22″
Sidewall3.93″
285/35R24 drawn to scale: 31.85 inch diameter, 3.93 inch sidewall, 24 inch wheel, 11.22 inch tread width24″ wheel3.93″31.85″ overall11.22″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 285/35R24 tires really are

Heights published by Toyo for the one tire in this size. Their published revolutions per mile work out to 31.0″ under load (below).

The one tire listed, the Toyo Proxes ST III, measures 31.89″: 0.03″ taller than the size code's 31.85″.

Height under load31.0″

Published revs per mile (651) mean the tire rolls like a 31.0″ tire on the vehicle. Use this for speedometer calibration.

1 tire in 285/35R24

Sort by the spec you care about.

LoadRevs/miSource
Toyo Proxes ST IIIPerformanceXL · 108W31.8940.810.12,205651Spec page

Is 285/35R24 a 32-inch tire?

≈32″

Yes. The size code works out to 31.85″, and the 1 tire here publishes 31.89″, so people call it a 32.

All 32-inch tire sizes, on every wheel size.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 285/35R24Difference
285/35R2330.85-1.00″-3.1%
335/30R2330.91-0.94″-3.0%
295/30R2430.97-0.89″-2.8%
295/35R2331.13-0.72″-2.3%
325/35R2331.96+0.10″+0.3%
285/40R2331.98+0.12″+0.4%
295/35R2432.13+0.28″+0.9%
305/35R2432.41+0.55″+1.7%
305/40R2332.61+0.75″+2.4%
285/40R2432.98+1.12″+3.5%

How to read 285/35R24

How to read any tire size

285/35R24 108W as printed on the tire sidewall, with each part numbered285/35R24 108W123456
How 285/35R24 108W 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

235Aspect ratio

A percentage, not a measurement: the sidewall is 35% as tall as the tire is wide, which is 99.8 mm or 3.93 inches.

3RConstruction

Radial construction.

424Wheel diameter

Mounts on a 24-inch wheel. Approved wheel widths run 9.5″ to 11.0″.

5108Load index

Each tire carries up to 2,205 lb (1,000 kg) at its maximum pressure.

6WSpeed rating

Rated for up to 168 mph sustained.

XLExtra load

Printed after the size.

SpecificationInchesMetric
Overall diameter31.85809 mm
Section width11.22285 mm
Sidewall height3.9399.8 mm
Circumference100.12,542 mm
Revolutions per mile (calculated, unloaded)633.1393 per km
Revolutions per mile (published by manufacturers)651405 per km
Approved wheel width9.5–11.0241–279 mm

Speedometer error after switching to 285/35R24

Your actual speed– mph

Questions about 285/35R24

What is 285/35R24 in inches?

31.85 inches tall, 11.22 inches wide, on a 24-inch wheel. Written in inches, that is roughly 31.9×11.2R24.

What wheel width do I need for 285/35R24?

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

How many revolutions per mile does a 285/35R24 make?

Published figures run 651 revolutions per mile. The calculated figure is 633.1, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 285/35R24 than 295/30R24?

0.89 inches taller on paper (31.85″ vs 30.97″), which raises the axle about 0.44″. Your speedometer will read about 2.9% slow.