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255/60R15 in inches

A 255/60R15 tire is 27.0″ tall and 10.0″ wide, and fits a 15″ wheel. In inches it is written 27.0×10.0R15.

Diameter27.05″
Width10.04″
Sidewall6.02″
255/60R15 drawn to scale: 27.05 inch diameter, 6.02 inch sidewall, 15 inch wheel, 10.04 inch tread width15″ wheel6.02″27.05″ overall10.04″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 255/60R15 tires really are

Heights published by BFGoodrich for the one tire in this size. Their published revolutions per mile work out to 26.2″ under load (below).

The one tire listed, the BFGoodrich Radial T/A, measures 27.10″: 0.05″ taller than the size code's 27.05″.

Height under load26.2″

Published revs per mile (769) mean the tire rolls like a 26.2″ tire on the vehicle. Use this for speedometer calibration.

1 tire in 255/60R15

Sort by the spec you care about.

LoadRevs/miSource
BFGoodrich Radial T/APerformanceSL · 102S27.1032.711.01,885769Spec page

Is 255/60R15 a 27-inch tire?

≈27″

Yes. The size code works out to 27.05″, and the 1 tire here publishes 27.10″, 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.

SizeDiameter ″vs 255/60R15Difference
205/70R1526.30-0.75″-2.8%
245/60R1526.57-0.47″-1.7%
295/50R1526.61-0.43″-1.6%
215/70R1526.85-0.20″-0.7%
27×11.00R1427.00-0.05″-0.2%
27×8.50R1427.00-0.05″-0.2%
215/65R1627.00-0.04″-0.2%
205/75R1527.11+0.06″+0.2%
225/70R1527.40+0.35″+1.3%
215/75R1527.70+0.65″+2.4%

How to read 255/60R15

How to read any tire size

P255/60R15 102S as printed on the tire sidewall, with each part numberedP255/60R15 102S1234567
How P255/60R15 102S 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.
1PP-metric

Marks a P-metric (passenger) tire. Sizes with no letter are Euro-metric.

2255Section width

255 mm across the widest point, or 10.04 inches. Every 255 size

360Aspect ratio

A percentage, not a measurement: the sidewall is 60% as tall as the tire is wide, which is 153.0 mm or 6.02 inches.

4RConstruction

Radial construction.

515Wheel diameter

Mounts on a 15-inch wheel. Approved wheel widths run 7.0″ to 9.0″.

6102Load index

Each tire carries up to 1,874 lb (850 kg) at its maximum pressure.

7SSpeed rating

Rated for up to 112 mph sustained.

SpecificationInchesMetric
Overall diameter27.05687 mm
Section width10.04255 mm
Sidewall height6.02153.0 mm
Circumference85.02,158 mm
Revolutions per mile (calculated, unloaded)745.7463 per km
Revolutions per mile (published by manufacturers)769478 per km
Approved wheel width7.0–9.0178–229 mm

Speedometer error after switching to 255/60R15

Your actual speed– mph

Questions about 255/60R15

What is 255/60R15 in inches?

27.05 inches tall, 10.04 inches wide, on a 15-inch wheel. Written in inches, that is roughly 27.0×10.0R15.

What wheel width do I need for 255/60R15?

Manufacturers approve 7.0–9.0″ wide wheels for this size.

How many revolutions per mile does a 255/60R15 make?

Published figures run 769 revolutions per mile. The calculated figure is 745.7, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 255/60R15 than 215/70R15?

0.20 inches taller on paper (27.05″ vs 26.85″), which raises the axle about 0.10″. Your speedometer will read about 0.7% slow.