225/70R15 in inches

A 225/70R15 tire is 27.4″ tall and 8.9″ wide, and fits a 15″ wheel. In inches it is written 27.4×8.9R15.

Diameter27.40″

Width8.86″

Sidewall6.20″

Drawn to scale. Nominal dimensions calculated from the size code.

Manufacturer data

How tall 225/70R15 tires really are

Heights published by BFGoodrich, General and Toyo for all 5 tires in this size. Their published revolutions per mile work out to 26.6″ under load (below).

Real 225/70R15 tires measure 27.40–27.44″, against 27.40″ from the size code. They run both taller and shorter than the size code.

Height under load26.6″

Published revs per mile (757–758) mean the tire rolls like a 26.6″ tire on the vehicle. Use this for speedometer calibration.

Weight spread25.7–30.3 lb

The lightest (General AltiMAX RT45, SL) is 4.6 lb lighter per corner than the heaviest (General Grabber A/TX, SL).

5 tires in 225/70R15

Sort by the spec you care about.

	Load					Revs/mi	Source
General AltiMAX RT45Touring	SL · 100T	27.40	25.7	11.0	1,764	758	Spec page
Toyo Celsius IITouring	SL · 100T	27.44	27.3	11.5	1,764	757	Spec page
Toyo Extensa A/S IIAll-season	SL · 100T	27.44	28.5	11.5	1,753	757	Spec page
BFGoodrich Radial T/APerformance	SL · 100S	27.44	30.1	12.0	1,753	758	Spec page
General Grabber A/TXAll-terrain	SL · 100T	27.40	30.3	14.0	1,764	758	Spec page

Is 225/70R15 a 27-inch tire?

≈27″

Close. The size code works out to 27.40″, and the 5 tires here publish 27.40–27.44″, so people call it a 27.

All 27-inch tire sizes, on every wheel size.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

Size	Diameter ″	vs 225/70R15	Difference
245/60R15	26.57	-0.83″	-3.0%
295/50R15	26.61	-0.79″	-2.9%
215/70R15	26.85	-0.55″	-2.0%
255/60R15	27.05	-0.35″	-1.3%
205/75R15	27.11	-0.30″	-1.1%
205/70R16	27.30	-0.10″	-0.4%
195/75R16	27.52	+0.11″	+0.4%
215/75R15	27.70	+0.30″	+1.1%
235/70R15	27.95	+0.55″	+2.0%
275/60R15	27.99	+0.59″	+2.2%

How to read 225/70R15

How to read any tire size

How 225/70R15 100T is printed on the sidewall. It's the most common code among the 5 tires here (3 of them); tires in this size come in other load and speed ratings too.

1225Section width

225 mm across the widest point, or 8.86 inches. Every 225 size

270Aspect ratio

A percentage, not a measurement: the sidewall is 70% as tall as the tire is wide, which is 157.5 mm or 6.20 inches.

3RConstruction

Radial construction.

415Wheel diameter

Mounts on a 15-inch wheel. Approved wheel widths run 6.0″ to 7.5″.

5100Load index

Each tire carries up to 1,764 lb (800 kg) at its maximum pressure.

6TSpeed rating

Rated for up to 118 mph sustained.

Specification	Inches	Metric
Overall diameter	27.40	696 mm
Section width	8.86	225 mm
Sidewall height	6.20	157.5 mm
Circumference	86.1	2,187 mm
Revolutions per mile (calculated, unloaded)	736.0	457 per km
Revolutions per mile (published by manufacturers)	757–758	470–471 per km
Approved wheel width	6.0–7.5	152–191 mm

Speedometer error after switching to 225/70R15

Your actual speed– mph

Questions about 225/70R15

What is 225/70R15 in inches?

27.40 inches tall, 8.86 inches wide, on a 15-inch wheel. Written in inches, that is roughly 27.4×8.9R15.

How much does a 225/70R15 tire weigh?

Between 25.7 lb and 30.3 lb for the 5 tires listed here. The lightest is the General AltiMAX RT45 (SL); the heaviest is the General Grabber A/TX (SL).

What wheel width do I need for 225/70R15?

Manufacturers approve 6.0–7.5″ wide wheels for this size.

How many revolutions per mile does a 225/70R15 make?

Published figures run 757–758 revolutions per mile. The calculated figure is 736.0, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 225/70R15 than 205/75R15?

0.30 inches taller on paper (27.40″ vs 27.11″), which raises the axle about 0.15″. Your speedometer will read about 1.1% slow.