345/30R19 in inches

A 345/30R19 tire is 27.1″ tall and 13.6″ wide, and fits a 19″ wheel. In inches it is written 27.1×13.6R19.

Diameter27.15″

Width13.58″

Sidewall4.07″

Drawn to scale. Nominal dimensions calculated from the size code.

Manufacturer data

How tall 345/30R19 tires really are

Heights published by Michelin and Toyo for all 5 tires in this size. Their published revolutions per mile work out to 26.4″ under load (below).

Real 345/30R19 tires measure 27.20–27.20″, against 27.15″ from the size code. Every one runs taller than the size code.

Height under load26.4″

Published revs per mile (764–765) mean the tire rolls like a 26.4″ tire on the vehicle. Use this for speedometer calibration.

Weight spread32.5–36.2 lb

The lightest (Toyo Proxes R, SL) is 3.7 lb lighter per corner than the heaviest (Toyo Proxes R888R, SL).

5 tires in 345/30R19

Sort by the spec you care about.

	Load					Revs/mi	Source
Toyo Proxes RPerformance	SL · 105W	27.20	32.5	3.7	2,039	764	Spec page
Toyo Proxes RRPerformance	SL	27.20	33.1	3.6	2,039	764	Spec page
Michelin Pilot Sport Cup 2 ConnectPerformance	XL · 109(Y)	27.20	33.2	7.2	2,271	765	Spec page
Michelin Pilot Super SportPerformance	XL · 109(Y)	27.20	34.9	9.0	2,271	765	Spec page
Toyo Proxes R888RPerformance	SL · 105(Y)	27.20	36.2	6.3	2,039	764	Spec page

Is 345/30R19 a 27-inch tire?

≈27″

Yes. The size code works out to 27.15″, and the 5 tires here publish 27.20″, 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.

Size	Diameter ″	vs 345/30R19	Difference
195/50R19	26.68	-0.47″	-1.7%
245/40R19	26.72	-0.43″	-1.6%
285/35R19	26.85	-0.30″	-1.1%
225/45R19	26.97	-0.18″	-0.7%
255/40R19	27.03	-0.12″	-0.4%
295/35R19	27.13	-0.02″	-0.1%
235/45R19	27.33	+0.18″	+0.7%
265/40R19	27.35	+0.20″	+0.7%
355/30R19	27.39	+0.24″	+0.9%
305/35R19	27.41	+0.26″	+0.9%

How to read 345/30R19

How to read any tire size

How 345/30R19 109Y is printed on the sidewall. It's the most common code among the 5 tires here (2 of them); tires in this size come in other load and speed ratings too.

1345Section width

345 mm across the widest point, or 13.58 inches. Every 345 size

230Aspect ratio

A percentage, not a measurement: the sidewall is 30% as tall as the tire is wide, which is 103.5 mm or 4.07 inches.

3RConstruction

Radial construction.

419Wheel diameter

Mounts on a 19-inch wheel. Approved wheel widths run 11.5″ to 12.5″.

5109Load index

Each tire carries up to 2,271 lb (1,030 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 2,271 lb each and the standard-load tires up to 2,039 lb, as published.

Specification	Inches	Metric
Overall diameter	27.15	690 mm
Section width	13.58	345 mm
Sidewall height	4.07	103.5 mm
Circumference	85.3	2,166 mm
Revolutions per mile (calculated, unloaded)	742.9	462 per km
Revolutions per mile (published by manufacturers)	764–765	475 per km
Approved wheel width	11.5–12.5	292–318 mm

Speedometer error after switching to 345/30R19

Your actual speed– mph

Questions about 345/30R19

What is 345/30R19 in inches?

27.15 inches tall, 13.58 inches wide, on a 19-inch wheel. Written in inches, that is roughly 27.1×13.6R19.

How much does a 345/30R19 tire weigh?

Between 32.5 lb and 36.2 lb for the 5 tires listed here. The lightest is the Toyo Proxes R (SL); the heaviest is the Toyo Proxes R888R (SL).

What wheel width do I need for 345/30R19?

Manufacturers approve 11.5–12.5″ wide wheels for this size.

How many revolutions per mile does a 345/30R19 make?

Published figures run 764–765 revolutions per mile. The calculated figure is 742.9, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 345/30R19 than 295/35R19?

0.02 inches taller on paper (27.15″ vs 27.13″), which raises the axle about 0.01″. Your speedometer will read about 0.1% slow.