tireheight.com

305/35R22 in inches

A 305/35R22 tire is 30.4″ tall and 12.0″ wide, and fits a 22″ wheel. In inches it is written 30.4×12.0R22.

Diameter30.41″
Width12.01″
Sidewall4.20″
305/35R22 drawn to scale: 30.41 inch diameter, 4.20 inch sidewall, 22 inch wheel, 12.01 inch tread width22″ wheel4.20″30.41″ overall12.01″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 305/35R22 tires really are

Heights published by Michelin for the one tire in this size. Their published revolutions per mile work out to 29.5″ under load (below).

The one tire listed, the Michelin Pilot Super Sport, measures 30.40″: 0.01″ shorter than the size code's 30.41″.

Height under load29.5″

Published revs per mile (684) mean the tire rolls like a 29.5″ tire on the vehicle. Use this for speedometer calibration.

1 tire in 305/35R22

Sort by the spec you care about.

LoadRevs/miSource
Michelin Pilot Super SportPerformanceXL · 110(Y)30.4035.610.02,337684Spec page

Is 305/35R22 a 30-inch tire?

≈30″

Close. The size code works out to 30.41″, and the 1 tire here publishes 30.40″, so people call it a 30.

All 30-inch tire sizes, on every wheel size.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 305/35R22Difference
285/35R2229.85-0.55″-1.8%
255/40R2230.03-0.37″-1.2%
295/35R2230.13-0.28″-0.9%
265/40R2230.35-0.06″-0.2%
265/45R2130.39-0.02″-0.1%
275/40R2230.66+0.26″+0.8%
315/35R2230.68+0.28″+0.9%
325/35R2230.96+0.55″+1.8%
285/40R2230.98+0.57″+1.9%
255/45R2231.04+0.63″+2.1%

How to read 305/35R22

How to read any tire size

305/35R22 110Y as printed on the tire sidewall, with each part numbered305/35R22 110Y123456
How 305/35R22 110Y 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.
1305Section width

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

235Aspect ratio

A percentage, not a measurement: the sidewall is 35% as tall as the tire is wide, which is 106.8 mm or 4.20 inches.

3RConstruction

Radial construction.

422Wheel diameter

Mounts on a 22-inch wheel. Approved wheel widths run 10.0″ to 12.0″.

5110Load index

Each tire carries up to 2,337 lb (1,060 kg) at its maximum pressure.

6YSpeed rating

Rated for up to 186 mph sustained.

XLExtra load

Printed after the size.

SpecificationInchesMetric
Overall diameter30.41772 mm
Section width12.01305 mm
Sidewall height4.20106.8 mm
Circumference95.52,426 mm
Revolutions per mile (calculated, unloaded)663.3412 per km
Revolutions per mile (published by manufacturers)684425 per km
Approved wheel width10.0–12.0254–305 mm

Speedometer error after switching to 305/35R22

Your actual speed– mph

Questions about 305/35R22

What is 305/35R22 in inches?

30.41 inches tall, 12.01 inches wide, on a 22-inch wheel. Written in inches, that is roughly 30.4×12.0R22.

What wheel width do I need for 305/35R22?

Manufacturers approve 10.0–12.0″ wide wheels for this size.

How many revolutions per mile does a 305/35R22 make?

Published figures run 684 revolutions per mile. The calculated figure is 663.3, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 305/35R22 than 265/40R22?

0.06 inches taller on paper (30.41″ vs 30.35″), which raises the axle about 0.03″. Your speedometer will read about 0.2% slow.