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305/30R22 in inches

A 305/30R22 tire is 29.2″ tall and 12.0″ wide, and fits a 22″ wheel. In inches it is written 29.2×12.0R22.

Diameter29.20″
Width12.01″
Sidewall3.60″
305/30R22 drawn to scale: 29.20 inch diameter, 3.60 inch sidewall, 22 inch wheel, 12.01 inch tread width22″ wheel3.60″29.20″ overall12.01″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 305/30R22 tires really are

Heights published by Michelin for all 2 tires in this size. Their published revolutions per mile work out to 28.4″ under load (below).

Real 305/30R22 tires measure 29.30″, against 29.20″ from the size code. Every one runs taller than the size code.

Height under load28.4″

Published revs per mile (711) mean the tire rolls like a 28.4″ tire on the vehicle. Use this for speedometer calibration.

Weight spread33.4–36.8 lb

The lightest (Michelin Pilot Super Sport, XL) is 3.4 lb lighter per corner than the heaviest (Michelin Pilot Sport EV, XL).

2 tires in 305/30R22

Sort by the spec you care about.

LoadRevs/miSource
Michelin Pilot Super SportPerformanceXL · 105(Y)29.3033.410.02,039711Spec page
Michelin Pilot Sport EVPerformanceXL · 105W29.3036.88.52,039711Spec page

Is 305/30R22 a 29-inch tire?

≈29″

Yes. The size code works out to 29.20″, and the 2 tires here publish 29.30″, so people call it a 29.

All 29-inch tire sizes, on every wheel size.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 305/30R22Difference
335/25R2228.59-0.61″-2.1%
285/30R2228.73-0.47″-1.6%
295/30R2228.97-0.24″-0.8%
255/35R2229.03-0.18″-0.6%
295/35R2129.13-0.07″-0.3%
345/30R2129.15-0.06″-0.2%
265/35R2229.30+0.10″+0.3%
315/30R2229.44+0.24″+0.8%
275/35R2229.58+0.37″+1.3%
285/35R2229.85+0.65″+2.2%

How to read 305/30R22

How to read any tire size

305/30R22 105W as printed on the tire sidewall, with each part numbered305/30R22 105W123456
How 305/30R22 105W 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.
1305Section width

305 mm across the widest point, or 12.01 inches. Every 305 size

230Aspect ratio

A percentage, not a measurement: the sidewall is 30% as tall as the tire is wide, which is 91.5 mm or 3.60 inches.

3RConstruction

Radial construction.

422Wheel diameter

Mounts on a 22-inch wheel. Approved wheel widths run 10.5″ to 11.5″.

5105Load index

Each tire carries up to 2,039 lb (925 kg) at its maximum pressure.

6WSpeed rating

Rated for up to 168 mph sustained.

XLExtra load

Printed after the size.

SpecificationInchesMetric
Overall diameter29.20742 mm
Section width12.01305 mm
Sidewall height3.6091.5 mm
Circumference91.72,330 mm
Revolutions per mile (calculated, unloaded)690.6429 per km
Revolutions per mile (published by manufacturers)711442 per km
Approved wheel width10.5–11.5267–292 mm

Speedometer error after switching to 305/30R22

Your actual speed– mph

Questions about 305/30R22

What is 305/30R22 in inches?

29.20 inches tall, 12.01 inches wide, on a 22-inch wheel. Written in inches, that is roughly 29.2×12.0R22.

How much does a 305/30R22 tire weigh?

Between 33.4 lb and 36.8 lb for the 2 tires listed here. The lightest is the Michelin Pilot Super Sport (XL); the heaviest is the Michelin Pilot Sport EV (XL).

What wheel width do I need for 305/30R22?

Manufacturers approve 10.5–11.5″ wide wheels for this size.

How many revolutions per mile does a 305/30R22 make?

Published figures run 711 revolutions per mile. The calculated figure is 690.6, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 305/30R22 than 255/35R22?

0.18 inches taller on paper (29.20″ vs 29.03″), which raises the axle about 0.09″. Your speedometer will read about 0.6% slow.