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255/45R22 in inches

A 255/45R22 tire is 31.0″ tall and 10.0″ wide, and fits a 22″ wheel. In inches it is written 31.0×10.0R22.

Diameter31.04″
Width10.04″
Sidewall4.52″
255/45R22 drawn to scale: 31.04 inch diameter, 4.52 inch sidewall, 22 inch wheel, 10.04 inch tread width22″ wheel4.52″31.04″ overall10.04″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 255/45R22 tires really are

Heights published by Michelin for all 2 tires in this size. Their published revolutions per mile work out to 30.1″ under load (below).

Real 255/45R22 tires measure 31.06″, against 31.04″ from the size code. Every one runs taller than the size code.

Height under load30.1″

Published revs per mile (670) mean the tire rolls like a 30.1″ tire on the vehicle. Use this for speedometer calibration.

Weight spread32.3–34.7 lb

The lightest (Michelin CrossClimate2, XL) is 2.4 lb lighter per corner than the heaviest (Michelin X-Ice Snow, XL).

2 tires in 255/45R22

Sort by the spec you care about.

LoadRevs/miSource
Michelin CrossClimate2All-seasonXL · 107V31.0632.310.02,149670Spec page
Michelin X-Ice SnowWinterXL · 107H31.0634.710.52,149670Spec page

Is 255/45R22 a 31-inch tire?

≈31″

Yes. The size code works out to 31.04″, and the 2 tires here publish 31.06″, 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 255/45R22Difference
265/40R2230.35-0.69″-2.2%
305/35R2230.41-0.63″-2.0%
275/40R2230.66-0.37″-1.2%
315/35R2230.68-0.35″-1.1%
325/35R2230.96-0.08″-0.3%
285/40R2230.98-0.06″-0.2%
255/50R2131.04+0.00″+0.0%
295/40R2231.29+0.26″+0.8%
305/40R2231.61+0.57″+1.8%
275/45R2231.74+0.71″+2.3%

How to read 255/45R22

How to read any tire size

255/45R22 107V as printed on the tire sidewall, with each part numbered255/45R22 107V123456
How 255/45R22 107V is printed on the sidewall. It's the most common code among the 2 tires here (1 of them); tires in this size come in other load and speed ratings too.
1255Section width

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

245Aspect ratio

A percentage, not a measurement: the sidewall is 45% as tall as the tire is wide, which is 114.8 mm or 4.52 inches.

3RConstruction

Radial construction.

422Wheel diameter

Mounts on a 22-inch wheel. Approved wheel widths run 8.0″ to 9.5″.

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 diameter31.04788 mm
Section width10.04255 mm
Sidewall height4.52114.8 mm
Circumference97.52,477 mm
Revolutions per mile (calculated, unloaded)649.8404 per km
Revolutions per mile (published by manufacturers)670416 per km
Approved wheel width8.0–9.5203–241 mm

Speedometer error after switching to 255/45R22

Your actual speed– mph

Questions about 255/45R22

What is 255/45R22 in inches?

31.04 inches tall, 10.04 inches wide, on a 22-inch wheel. Written in inches, that is roughly 31.0×10.0R22.

How much does a 255/45R22 tire weigh?

Between 32.3 lb and 34.7 lb for the 2 tires listed here. The lightest is the Michelin CrossClimate2 (XL); the heaviest is the Michelin X-Ice Snow (XL).

What wheel width do I need for 255/45R22?

Manufacturers approve 8.0–9.5″ wide wheels for this size.

How many revolutions per mile does a 255/45R22 make?

Published figures run 670 revolutions per mile. The calculated figure is 649.8, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 255/45R22 than 285/40R22?

0.06 inches taller on paper (31.04″ vs 30.98″), which raises the axle about 0.03″. Your speedometer will read about 0.2% slow.