tireheight.com

235/60R20 in inches

A 235/60R20 tire is 31.1″ tall and 9.3″ wide, and fits a 20″ wheel. In inches it is written 31.1×9.3R20.

Diameter31.10″
Width9.25″
Sidewall5.55″
235/60R20 drawn to scale: 31.10 inch diameter, 5.55 inch sidewall, 20 inch wheel, 9.25 inch tread width20″ wheel5.55″31.10″ overall9.25″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 235/60R20 tires really are

Heights published by Michelin for the one tire in this size. Their published revolutions per mile work out to 30.1″ under load (below).

The one tire listed, the Michelin X-Ice Snow, measures 31.10″: 0.00″ shorter than the size code's 31.10″.

Height under load30.1″

Published revs per mile (669) mean the tire rolls like a 30.1″ tire on the vehicle. Use this for speedometer calibration.

1 tire in 235/60R20

Sort by the spec you care about.

LoadRevs/miSource
Michelin X-Ice SnowWinterXL · 108T31.1031.710.52,205669Spec page

Is 235/60R20 a 31-inch tire?

≈31″

Yes. The size code works out to 31.10″, and the 1 tire here publishes 31.10″, 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 235/60R20Difference
265/50R2030.43-0.67″-2.2%
295/45R2030.45-0.65″-2.1%
305/45R2030.81-0.30″-0.9%
275/50R2030.83-0.28″-0.9%
255/55R2031.04-0.06″-0.2%
255/60R1931.05-0.06″-0.2%
285/45R2131.10-0.00″-0.0%
285/50R2031.22+0.12″+0.4%
265/55R2031.48+0.37″+1.2%
245/60R2031.57+0.47″+1.5%

How to read 235/60R20

How to read any tire size

235/60R20 108T as printed on the tire sidewall, with each part numbered235/60R20 108T123456
How 235/60R20 108T 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.
1235Section width

235 mm across the widest point, or 9.25 inches. Every 235 size

260Aspect ratio

A percentage, not a measurement: the sidewall is 60% as tall as the tire is wide, which is 141.0 mm or 5.55 inches.

3RConstruction

Radial construction.

420Wheel diameter

Mounts on a 20-inch wheel. Approved wheel widths run 6.5″ to 8.5″.

5108Load index

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

6TSpeed rating

Rated for up to 118 mph sustained.

XLExtra load

Printed after the size.

SpecificationInchesMetric
Overall diameter31.10790 mm
Section width9.25235 mm
Sidewall height5.55141.0 mm
Circumference97.72,482 mm
Revolutions per mile (calculated, unloaded)648.4403 per km
Revolutions per mile (published by manufacturers)669416 per km
Approved wheel width6.5–8.5165–216 mm

Speedometer error after switching to 235/60R20

Your actual speed– mph

Questions about 235/60R20

What is 235/60R20 in inches?

31.10 inches tall, 9.25 inches wide, on a 20-inch wheel. Written in inches, that is roughly 31.1×9.3R20.

What wheel width do I need for 235/60R20?

Manufacturers approve 6.5–8.5″ wide wheels for this size.

How many revolutions per mile does a 235/60R20 make?

Published figures run 669 revolutions per mile. The calculated figure is 648.4, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 235/60R20 than 255/55R20?

0.06 inches taller on paper (31.10″ vs 31.04″), which raises the axle about 0.03″. Your speedometer will read about 0.2% slow.