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285/35R23 in inches

A 285/35R23 tire is 30.9″ tall and 11.2″ wide, and fits a 23″ wheel. In inches it is written 30.9×11.2R23.

Diameter30.85″
Width11.22″
Sidewall3.93″
285/35R23 drawn to scale: 30.85 inch diameter, 3.93 inch sidewall, 23 inch wheel, 11.22 inch tread width23″ wheel3.93″30.85″ overall11.22″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 285/35R23 tires really are

Heights published by Michelin for the one tire in this size. Their published revolutions per mile work out to 29.9″ under load (below).

The one tire listed, the Michelin Pilot Sport EV, measures 30.90″: 0.05″ taller than the size code's 30.85″.

Height under load29.9″

Published revs per mile (674) mean the tire rolls like a 29.9″ tire on the vehicle. Use this for speedometer calibration.

1 tire in 285/35R23

Sort by the spec you care about.

LoadRevs/miSource
Michelin Pilot Sport EVPerformanceXL · 107V30.9038.68.52,149674Spec page

Is 285/35R23 a 31-inch tire?

≈31″

Yes. The size code works out to 30.85″, and the 1 tire here publishes 30.90″, so people call it a 31.

All 31-inch tire sizes, on every wheel size.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 285/35R23Difference
315/30R2330.44-0.41″-1.3%
275/40R2230.66-0.19″-0.6%
315/35R2230.68-0.17″-0.6%
335/30R2330.91+0.06″+0.2%
325/35R2230.96+0.10″+0.3%
295/30R2430.97+0.11″+0.4%
285/40R2230.98+0.12″+0.4%
255/45R2231.04+0.18″+0.6%
295/35R2331.13+0.28″+0.9%
325/35R2331.96+1.10″+3.6%

How to read 285/35R23

How to read any tire size

285/35R23 107V as printed on the tire sidewall, with each part numbered285/35R23 107V123456
How 285/35R23 107V 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.

423Wheel diameter

Mounts on a 23-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.

6VSpeed rating

Rated for up to 149 mph sustained.

XLExtra load

Printed after the size.

SpecificationInchesMetric
Overall diameter30.85784 mm
Section width11.22285 mm
Sidewall height3.9399.8 mm
Circumference96.92,462 mm
Revolutions per mile (calculated, unloaded)653.7406 per km
Revolutions per mile (published by manufacturers)674419 per km
Approved wheel width9.5–11.0241–279 mm

Speedometer error after switching to 285/35R23

Your actual speed– mph

Questions about 285/35R23

What is 285/35R23 in inches?

30.85 inches tall, 11.22 inches wide, on a 23-inch wheel. Written in inches, that is roughly 30.9×11.2R23.

What wheel width do I need for 285/35R23?

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

How many revolutions per mile does a 285/35R23 make?

Published figures run 674 revolutions per mile. The calculated figure is 653.7, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 285/35R23 than 315/30R23?

0.41 inches taller on paper (30.85″ vs 30.44″), which raises the axle about 0.21″. Your speedometer will read about 1.4% slow.