255/45R19 in inches

A 255/45R19 tire is 28.0″ tall and 10.0″ wide, and fits a 19″ wheel. In inches it is written 28.0×10.0R19.

Diameter28.04″

Width10.04″

Sidewall4.52″

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

Manufacturer data

How tall 255/45R19 tires really are

Heights published by General, Michelin and Toyo for all 18 tires in this size. Their published revolutions per mile work out to 27.2–27.3″ under load (below).

Real 255/45R19 tires measure 28.00–28.10″, against 28.04″ from the size code. Most run taller than the size code (15 of 18).

Height under load27.2–27.3″

Published revs per mile (740–742) mean the tire rolls like a 27.2–27.3″ tire on the vehicle. Use this for speedometer calibration.

Weight spread25.5–31.5 lb

The lightest (General AltiMAX RT45, XL) is 6.0 lb lighter per corner than the heaviest (Toyo Proxes G-Tour, XL).

18 tires in 255/45R19

Sort by the spec you care about.

	Load					Revs/mi	Source
General AltiMAX RT45Touring	XL · 104V	28.00	25.5	11.0	1,984	741	Spec page
Michelin Pilot Alpin 5Winter	XL · 104H	28.07	26.0	9.5	1,984	741	Spec page
Michelin Pilot Sport 5Performance	XL · 104(Y)	28.10	26.3	9.0	1,984	741	Spec page
Michelin Pilot Sport All-Season 4Performance	XL · 104Y	28.00	27.4	10.0	1,984	742	Spec page
Michelin Pilot Super SportPerformance	SL · 100(Y)	28.10	27.6	9.0	1,764	741	Spec page
Michelin e.Primacy All SeasonTouring	XL · 104W	28.10	28.3	8.5	1,984	741	Spec page
Michelin Pilot Alpin PA4Winter	SL · 100V	28.07	28.9	10.5	1,764	741	Spec page
Michelin Pilot Alpin PA4Winter	XL · 104V	28.07	29.2	10.5	1,984	741	Spec page
Michelin Pilot Sport 4Performance	XL · 104(Y)	28.10	29.2	9.5	1,984	741	Spec page
Michelin CrossClimate2All-season	XL · 104V	28.10	29.3	10.0	1,984	741	Spec page
Michelin X-Ice SnowWinter	XL · 104H	28.07	29.3	10.5	1,984	741	Spec page
Michelin X-Ice Snow+Winter	XL · 104H	28.07	29.6	10.5	1,984	741	Spec page
Toyo Proxes Sport 2Performance	XL · 104Y	28.10	29.8	9.2	1,984	740	Spec page
Toyo Proxes Sport A/SPerformance	XL · 104Y	28.07	30.3	9.7	1,984	740	Spec page
Toyo Celsius IITouring	XL · 104V	28.07	30.8	11.5	1,984	740	Spec page
Toyo Observe G3-IceWinter	XL · 104T	28.07	31.5	11.3	1,984	740	Spec page
Toyo Proxes G-Tour	XL · 104V	28.07	31.5	11.8	1,984	740	Spec page
General AltiMAX Arctic XWinter	XL · 104T	28.00	–	12.0	1,984	741	Spec page

Is 255/45R19 a 28-inch tire?

≈28″

Yes. The size code works out to 28.04″, and the 18 tires here publish 28.00–28.10″, so people call it a 28.

All 28-inch tire sizes, on every wheel size.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

Size	Diameter ″	vs 255/45R19	Difference
265/40R19	27.35	-0.69″	-2.5%
355/30R19	27.39	-0.65″	-2.3%
305/35R19	27.41	-0.63″	-2.2%
275/40R19	27.66	-0.37″	-1.3%
245/45R19	27.68	-0.35″	-1.3%
285/40R19	27.98	-0.06″	-0.2%
235/50R19	28.25	+0.22″	+0.8%
295/40R19	28.29	+0.26″	+0.9%
265/45R19	28.39	+0.35″	+1.3%
245/50R19	28.65	+0.61″	+2.2%

How to read 255/45R19

How to read any tire size

How 255/45R19 104V is printed on the sidewall. It's the most common code among the 18 tires here (5 of them); tires in this size come in other load and speed ratings too.

1255Section width

255 mm across the widest point, or 10.04 inches. Every 255 size

245Aspect ratio

A percentage, not a measurement: the sidewall is 45% as tall as the tire is wide, which is 114.8 mm or 4.52 inches.

3RConstruction

Radial construction.

419Wheel diameter

Mounts on a 19-inch wheel. Approved wheel widths run 8.0″ to 9.5″.

5104Load index

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

6VSpeed rating

Rated for up to 149 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.

Specification	Inches	Metric
Overall diameter	28.04	712 mm
Section width	10.04	255 mm
Sidewall height	4.52	114.8 mm
Circumference	88.1	2,237 mm
Revolutions per mile (calculated, unloaded)	719.4	447 per km
Revolutions per mile (published by manufacturers)	740–742	460–461 per km
Approved wheel width	8.0–9.5	203–241 mm

Speedometer error after switching to 255/45R19

Your actual speed– mph

Questions about 255/45R19

What is 255/45R19 in inches?

28.04 inches tall, 10.04 inches wide, on a 19-inch wheel. Written in inches, that is roughly 28.0×10.0R19.

How much does a 255/45R19 tire weigh?

Between 25.5 lb and 31.5 lb for the 17 tires listed here. The lightest is the General AltiMAX RT45 (XL); the heaviest is the Toyo Proxes G-Tour (XL).

What wheel width do I need for 255/45R19?

Manufacturers approve 8.0–9.5″ wide wheels for this size.

How many revolutions per mile does a 255/45R19 make?

Published figures run 740–742 revolutions per mile. The calculated figure is 719.4, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 255/45R19 than 285/40R19?

0.06 inches taller on paper (28.04″ vs 27.98″), which raises the axle about 0.03″. Your speedometer will read about 0.2% slow.