tireheight.com

315/30R19 in inches

A 315/30R19 tire is 26.4″ tall and 12.4″ wide, and fits a 19″ wheel. In inches it is written 26.4×12.4R19.

Diameter26.44″
Width12.40″
Sidewall3.72″
315/30R19 drawn to scale: 26.44 inch diameter, 3.72 inch sidewall, 19 inch wheel, 12.40 inch tread width19″ wheel3.72″26.44″ overall12.40″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 315/30R19 tires really are

Heights published by Michelin for all 2 tires in this size. Their published revolutions per mile work out to 25.7″ under load (below).

Real 315/30R19 tires measure 26.50″, against 26.44″ from the size code. Every one runs taller than the size code.

Height under load25.7″

Published revs per mile (785) mean the tire rolls like a 25.7″ tire on the vehicle. Use this for speedometer calibration.

Weight spread26.5–29.8 lb

The lightest (Michelin Pilot Sport Cup 2, SL) is 3.3 lb lighter per corner than the heaviest (Michelin Pilot Sport 4 S, XL).

2 tires in 315/30R19

Sort by the spec you care about.

LoadRevs/miSource
Michelin Pilot Sport Cup 2PerformanceSL · 100(Y)26.5026.56.01,764785Spec page
Michelin Pilot Sport 4 SPerformanceXL · 104(Y)26.5029.89.51,984785Spec page

Is 315/30R19 a 27-inch tire?

≈27″

Close. The size code works out to 26.44″, and the 2 tires here publish 26.50″, 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 315/30R19Difference
255/35R1926.03-0.41″-1.6%
225/40R1926.09-0.35″-1.3%
305/30R1926.20-0.24″-0.9%
265/35R1926.30-0.14″-0.5%
235/40R1926.40-0.04″-0.1%
275/35R1926.58+0.14″+0.5%
195/50R1926.68+0.24″+0.9%
325/30R1926.68+0.24″+0.9%
245/40R1926.72+0.28″+1.0%
285/35R1926.85+0.41″+1.6%

How to read 315/30R19

How to read any tire size

315/30R19 104Y as printed on the tire sidewall, with each part numbered315/30R19 104Y123456
How 315/30R19 104Y 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.
1315Section width

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

230Aspect ratio

A percentage, not a measurement: the sidewall is 30% as tall as the tire is wide, which is 94.5 mm or 3.72 inches.

3RConstruction

Radial construction.

419Wheel diameter

Mounts on a 19-inch wheel. Approved wheel widths run 10.5″ to 11.5″.

5104Load index

Each tire carries up to 1,984 lb (900 kg) at its maximum pressure.

6YSpeed rating

Rated for up to 186 mph sustained.

XLExtra load

Printed after the size. In this size the XL tires carry up to 1,984 lb each and the standard-load tires up to 1,764 lb, as published.

SpecificationInchesMetric
Overall diameter26.44672 mm
Section width12.40315 mm
Sidewall height3.7294.5 mm
Circumference83.12,110 mm
Revolutions per mile (calculated, unloaded)762.8474 per km
Revolutions per mile (published by manufacturers)785488 per km
Approved wheel width10.5–11.5267–292 mm

Speedometer error after switching to 315/30R19

Your actual speed– mph

Questions about 315/30R19

What is 315/30R19 in inches?

26.44 inches tall, 12.40 inches wide, on a 19-inch wheel. Written in inches, that is roughly 26.4×12.4R19.

How much does a 315/30R19 tire weigh?

Between 26.5 lb and 29.8 lb for the 2 tires listed here. The lightest is the Michelin Pilot Sport Cup 2 (SL); the heaviest is the Michelin Pilot Sport 4 S (XL).

What wheel width do I need for 315/30R19?

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

How many revolutions per mile does a 315/30R19 make?

Published figures run 785 revolutions per mile. The calculated figure is 762.8, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 315/30R19 than 235/40R19?

0.04 inches taller on paper (26.44″ vs 26.40″), which raises the axle about 0.02″. Your speedometer will read about 0.1% slow.