tireheight.com

235/70R15 in inches

A 235/70R15 tire is 28.0″ tall and 9.3″ wide, and fits a 15″ wheel. In inches it is written 28.0×9.3R15.

Diameter27.95″
Width9.25″
Sidewall6.48″
235/70R15 drawn to scale: 27.95 inch diameter, 6.48 inch sidewall, 15 inch wheel, 9.25 inch tread width15″ wheel6.48″27.95″ overall9.25″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 235/70R15 tires really are

Heights published by General for the one tire in this size. Their published revolutions per mile work out to 27.1″ under load (below).

The one tire listed, the General AltiMAX RT45, measures 28.00″: 0.05″ taller than the size code's 27.95″.

Height under load27.1″

Published revs per mile (743) mean the tire rolls like a 27.1″ tire on the vehicle. Use this for speedometer calibration.

1 tire in 235/70R15

Sort by the spec you care about.

LoadRevs/miSource
General AltiMAX RT45TouringSL · 103T28.0026.811.01,929743Spec page

Is 235/70R15 a 28-inch tire?

≈28″

Yes. The size code works out to 27.95″, and the 1 tire here publishes 28.00″, so people call it a 28.

All 28-inch tire sizes, on every wheel size.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 235/70R15Difference
255/60R1527.05-0.91″-3.2%
205/75R1527.11-0.85″-3.0%
225/70R1527.40-0.55″-2.0%
215/75R1527.70-0.26″-0.9%
215/70R1627.85-0.10″-0.4%
275/60R1527.99+0.04″+0.1%
28×10.00R1428.00+0.05″+0.2%
235/65R1628.03+0.07″+0.3%
205/75R1628.11+0.15″+0.5%
225/75R1528.29+0.33″+1.2%

How to read 235/70R15

How to read any tire size

235/70R15 103T as printed on the tire sidewall, with each part numbered235/70R15 103T123456
How 235/70R15 103T 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

270Aspect ratio

A percentage, not a measurement: the sidewall is 70% as tall as the tire is wide, which is 164.5 mm or 6.48 inches.

3RConstruction

Radial construction.

415Wheel diameter

Mounts on a 15-inch wheel. Approved wheel widths run 6.0″ to 8.0″.

5103Load index

Each tire carries up to 1,929 lb (875 kg) at its maximum pressure.

6TSpeed rating

Rated for up to 118 mph sustained.

SpecificationInchesMetric
Overall diameter27.95710 mm
Section width9.25235 mm
Sidewall height6.48164.5 mm
Circumference87.82,231 mm
Revolutions per mile (calculated, unloaded)721.5448 per km
Revolutions per mile (published by manufacturers)743462 per km
Approved wheel width6.0–8.0152–203 mm

Speedometer error after switching to 235/70R15

Your actual speed– mph

Questions about 235/70R15

What is 235/70R15 in inches?

27.95 inches tall, 9.25 inches wide, on a 15-inch wheel. Written in inches, that is roughly 28.0×9.3R15.

What wheel width do I need for 235/70R15?

Manufacturers approve 6.0–8.0″ wide wheels for this size.

How many revolutions per mile does a 235/70R15 make?

Published figures run 743 revolutions per mile. The calculated figure is 721.5, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 235/70R15 than 215/75R15?

0.26 inches taller on paper (27.95″ vs 27.70″), which raises the axle about 0.13″. Your speedometer will read about 0.9% slow.