305/35R19 in inches

A 305/35R19 tire is 27.4″ tall and 12.0″ wide, and fits a 19″ wheel. In inches it is written 27.4×12.0R19.

Diameter27.41″

Width12.01″

Sidewall4.20″

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

Manufacturer data

How tall 305/35R19 tires really are

Heights published by Michelin for all 2 tires in this size. Their published revolutions per mile work out to 26.6″ under load (below).

Real 305/35R19 tires measure 27.40″, against 27.41″ from the size code. They run both taller and shorter than the size code.

Height under load26.6″

Published revs per mile (758) mean the tire rolls like a 26.6″ tire on the vehicle. Use this for speedometer calibration.

Weight spread29.7–30.8 lb

The lightest (Michelin Pilot Sport Cup 2, XL) is 1.1 lb lighter per corner than the heaviest (Michelin Pilot Super Sport, SL).

2 tires in 305/35R19

Sort by the spec you care about.

	Load					Revs/mi	Source
Michelin Pilot Sport Cup 2Performance	XL · 106(Y)	27.40	29.7	6.0	2,094	758	Spec page
Michelin Pilot Super SportPerformance	SL · 102(Y)	27.40	30.8	8.0	1,874	758	Spec page

Is 305/35R19 a 27-inch tire?

≈27″

Close. The size code works out to 27.41″, and the 2 tires here publish 27.40″, 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 305/35R19	Difference
285/35R19	26.85	-0.55″	-2.0%
225/45R19	26.97	-0.43″	-1.6%
255/40R19	27.03	-0.37″	-1.4%
295/35R19	27.13	-0.28″	-1.0%
345/30R19	27.15	-0.26″	-0.9%
235/45R19	27.33	-0.08″	-0.3%
265/40R19	27.35	-0.06″	-0.2%
355/30R19	27.39	-0.02″	-0.1%
275/40R19	27.66	+0.26″	+0.9%
245/45R19	27.68	+0.28″	+1.0%

How to read 305/35R19

How to read any tire size

How 305/35R19 106Y 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

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.

419Wheel diameter

Mounts on a 19-inch wheel. Approved wheel widths run 10.0″ to 12.0″.

5106Load index

Each tire carries up to 2,094 lb (950 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 2,094 lb each and the standard-load tires up to 1,874 lb, as published.

Specification	Inches	Metric
Overall diameter	27.41	696 mm
Section width	12.01	305 mm
Sidewall height	4.20	106.8 mm
Circumference	86.1	2,187 mm
Revolutions per mile (calculated, unloaded)	735.9	457 per km
Revolutions per mile (published by manufacturers)	758	471 per km
Approved wheel width	10.0–12.0	254–305 mm

Speedometer error after switching to 305/35R19

Your actual speed– mph

Questions about 305/35R19

What is 305/35R19 in inches?

27.41 inches tall, 12.01 inches wide, on a 19-inch wheel. Written in inches, that is roughly 27.4×12.0R19.

How much does a 305/35R19 tire weigh?

Between 29.7 lb and 30.8 lb for the 2 tires listed here. The lightest is the Michelin Pilot Sport Cup 2 (XL); the heaviest is the Michelin Pilot Super Sport (SL).

What wheel width do I need for 305/35R19?

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

How many revolutions per mile does a 305/35R19 make?

Published figures run 758 revolutions per mile. The calculated figure is 735.9, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 305/35R19 than 355/30R19?

0.02 inches taller on paper (27.41″ vs 27.39″), which raises the axle about 0.01″. Your speedometer will read about 0.1% slow.