tireheight.com

285/30R22 in inches

A 285/30R22 tire is 28.7″ tall and 11.2″ wide, and fits a 22″ wheel. In inches it is written 28.7×11.2R22.

Diameter28.73″
Width11.22″
Sidewall3.37″
285/30R22 drawn to scale: 28.73 inch diameter, 3.37 inch sidewall, 22 inch wheel, 11.22 inch tread width22″ wheel3.37″28.73″ overall11.22″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 285/30R22 tires really are

Heights published by Michelin for the one tire in this size. Their published revolutions per mile work out to 27.9″ under load (below).

The one tire listed, the Michelin Pilot Sport 4 S, measures 28.80″: 0.07″ taller than the size code's 28.73″.

Height under load27.9″

Published revs per mile (723) mean the tire rolls like a 27.9″ tire on the vehicle. Use this for speedometer calibration.

1 tire in 285/30R22

Sort by the spec you care about.

LoadRevs/miSource
Michelin Pilot Sport 4 SPerformanceXL · 101(Y)28.8028.99.51,819723Spec page

Is 285/30R22 a 29-inch tire?

≈29″

Yes. The size code works out to 28.73″, and the 1 tire here publishes 28.80″, 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 285/30R22Difference
255/30R2228.02-0.71″-2.5%
265/30R2228.26-0.47″-1.6%
335/25R2228.59-0.14″-0.5%
325/30R2128.68-0.06″-0.2%
245/40R2128.72-0.02″-0.1%
295/30R2228.97+0.24″+0.8%
255/35R2229.03+0.30″+1.0%
305/30R2229.20+0.47″+1.6%
265/35R2229.30+0.57″+2.0%
315/30R2229.44+0.71″+2.5%

How to read 285/30R22

How to read any tire size

285/30R22 101Y as printed on the tire sidewall, with each part numbered285/30R22 101Y123456
How 285/30R22 101Y 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

230Aspect ratio

A percentage, not a measurement: the sidewall is 30% as tall as the tire is wide, which is 85.5 mm or 3.37 inches.

3RConstruction

Radial construction.

422Wheel diameter

Mounts on a 22-inch wheel. Approved wheel widths run 9.5″ to 10.5″.

5101Load index

Each tire carries up to 1,819 lb (825 kg) at its maximum pressure.

6YSpeed rating

Rated for up to 186 mph sustained.

XLExtra load

Printed after the size.

SpecificationInchesMetric
Overall diameter28.73730 mm
Section width11.22285 mm
Sidewall height3.3785.5 mm
Circumference90.32,293 mm
Revolutions per mile (calculated, unloaded)701.9436 per km
Revolutions per mile (published by manufacturers)723449 per km
Approved wheel width9.5–10.5241–267 mm

Speedometer error after switching to 285/30R22

Your actual speed– mph

Questions about 285/30R22

What is 285/30R22 in inches?

28.73 inches tall, 11.22 inches wide, on a 22-inch wheel. Written in inches, that is roughly 28.7×11.2R22.

What wheel width do I need for 285/30R22?

Manufacturers approve 9.5–10.5″ wide wheels for this size.

How many revolutions per mile does a 285/30R22 make?

Published figures run 723 revolutions per mile. The calculated figure is 701.9, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 285/30R22 than 335/25R22?

0.14 inches taller on paper (28.73″ vs 28.59″), which raises the axle about 0.07″. Your speedometer will read about 0.5% slow.