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315/35R22 in inches

A 315/35R22 tire is 30.7″ tall and 12.4″ wide, and fits a 22″ wheel. In inches it is written 30.7×12.4R22.

Diameter30.68″
Width12.40″
Sidewall4.34″
315/35R22 drawn to scale: 30.68 inch diameter, 4.34 inch sidewall, 22 inch wheel, 12.40 inch tread width22″ wheel4.34″30.68″ overall12.40″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 315/35R22 tires really are

Heights published by Michelin for all 4 tires in this size. Their published revolutions per mile work out to 29.7″ under load (below).

Real 315/35R22 tires measure 30.70″, against 30.68″ from the size code. They run both taller and shorter than the size code.

Height under load29.7″

Published revs per mile (678) mean the tire rolls like a 29.7″ tire on the vehicle. Use this for speedometer calibration.

Weight spread34.7–43.4 lb

The lightest (Michelin Pilot Sport EV, XL) is 8.7 lb lighter per corner than the heaviest (Michelin Pilot Sport 4 SUV, XL).

4 tires in 315/35R22

Sort by the spec you care about.

LoadRevs/miSource
Michelin Pilot Sport EVPerformanceXL · 111Y30.7034.78.52,403678Spec page
Michelin Pilot Sport 4 SUVPerformanceXL · 111(Y)30.7035.29.02,403678Spec page
Michelin Pilot Sport All-Season 4PerformanceXL · 111Y30.7035.610.02,403678Spec page
Michelin Pilot Sport 4 SUVPerformanceXL · 111Y30.7043.49.52,403678Spec page

Is 315/35R22 a 31-inch tire?

≈31″

Yes. The size code works out to 30.68″, and the 4 tires here publish 30.70″, 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 315/35R22Difference
255/40R2230.03-0.65″-2.1%
295/35R2230.13-0.55″-1.8%
265/40R2230.35-0.33″-1.1%
305/35R2230.41-0.28″-0.9%
275/40R2230.66-0.02″-0.1%
275/45R2130.74+0.06″+0.2%
325/35R2230.96+0.28″+0.9%
285/40R2230.98+0.30″+1.0%
255/45R2231.04+0.35″+1.2%
295/40R2231.29+0.61″+2.0%

How to read 315/35R22

How to read any tire size

315/35R22 111Y as printed on the tire sidewall, with each part numbered315/35R22 111Y123456
How 315/35R22 111Y is printed on the sidewall. It's the most common code among the 4 tires here (3 of them); tires in this size come in other load and speed ratings too.
1315Section width

315 mm across the widest point, or 12.40 inches. Every 315 size

235Aspect ratio

A percentage, not a measurement: the sidewall is 35% as tall as the tire is wide, which is 110.2 mm or 4.34 inches.

3RConstruction

Radial construction.

422Wheel diameter

Mounts on a 22-inch wheel. Approved wheel widths run 10.5″ to 12.5″.

5111Load index

Each tire carries up to 2,403 lb (1,090 kg) at its maximum pressure.

6YSpeed rating

Rated for up to 186 mph sustained.

XLExtra load

Printed after the size.

SpecificationInchesMetric
Overall diameter30.68779 mm
Section width12.40315 mm
Sidewall height4.34110.2 mm
Circumference96.42,448 mm
Revolutions per mile (calculated, unloaded)657.3408 per km
Revolutions per mile (published by manufacturers)678421 per km
Approved wheel width10.5–12.5267–318 mm

Speedometer error after switching to 315/35R22

Your actual speed– mph

Questions about 315/35R22

What is 315/35R22 in inches?

30.68 inches tall, 12.40 inches wide, on a 22-inch wheel. Written in inches, that is roughly 30.7×12.4R22.

How much does a 315/35R22 tire weigh?

Between 34.7 lb and 43.4 lb for the 4 tires listed here. The lightest is the Michelin Pilot Sport EV (XL); the heaviest is the Michelin Pilot Sport 4 SUV (XL).

What wheel width do I need for 315/35R22?

Manufacturers approve 10.5–12.5″ wide wheels for this size.

How many revolutions per mile does a 315/35R22 make?

Published figures run 678 revolutions per mile. The calculated figure is 657.3, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 315/35R22 than 275/40R22?

0.02 inches taller on paper (30.68″ vs 30.66″), which raises the axle about 0.01″. Your speedometer will read about 0.1% slow.