195/45R17 in inches

A 195/45R17 tire is 23.9″ tall and 7.7″ wide, and fits a 17″ wheel. In inches it is written 23.9×7.7R17.

Diameter23.91″

Width7.68″

Sidewall3.45″

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

Manufacturer data

How tall 195/45R17 tires really are

Heights published by Michelin for the one tire in this size. Their published revolutions per mile work out to 23.2″ under load (below).

The one tire listed, the Michelin Pilot Sport 4, measures 23.90″: 0.01″ shorter than the size code's 23.91″.

Height under load23.2″

Published revs per mile (869) mean the tire rolls like a 23.2″ tire on the vehicle. Use this for speedometer calibration.

1 tire in 195/45R17

Sort by the spec you care about.

	Load					Revs/mi	Source
Michelin Pilot Sport 4Performance	SL · 81W	23.90	17.6	9.5	1,019	869	Spec page

Is 195/45R17 a 24-inch tire?

≈24″

Yes. The size code works out to 23.91″, and the 1 tire here publishes 23.90″, so people call it a 24.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

Size	Diameter ″	vs 195/45R17	Difference
205/40R17	23.46	-0.45″	-1.9%
245/35R17	23.75	-0.16″	-0.7%
215/40R17	23.77	-0.14″	-0.6%
215/35R18	23.93	+0.02″	+0.1%
225/45R16	23.97	+0.06″	+0.3%
185/55R16	24.01	+0.10″	+0.4%
205/45R17	24.26	+0.35″	+1.5%
235/40R17	24.40	+0.49″	+2.1%
215/45R17	24.62	+0.71″	+3.0%
245/40R17	24.72	+0.81″	+3.4%

How to read 195/45R17

How to read any tire size

How 195/45R17 81W 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.

1195Section width

195 mm across the widest point, or 7.68 inches. Every 195 size

245Aspect ratio

A percentage, not a measurement: the sidewall is 45% as tall as the tire is wide, which is 87.8 mm or 3.45 inches.

3RConstruction

Radial construction.

417Wheel diameter

Mounts on a 17-inch wheel. Approved wheel widths run 6.0″ to 7.5″.

581Load index

Each tire carries up to 1,019 lb (462 kg) at its maximum pressure.

6WSpeed rating

Rated for up to 168 mph sustained.

Specification	Inches	Metric
Overall diameter	23.91	607 mm
Section width	7.68	195 mm
Sidewall height	3.45	87.8 mm
Circumference	75.1	1,908 mm
Revolutions per mile (calculated, unloaded)	843.5	524 per km
Revolutions per mile (published by manufacturers)	869	540 per km
Approved wheel width	6.0–7.5	152–191 mm

Speedometer error after switching to 195/45R17

Your actual speed– mph

Questions about 195/45R17

What is 195/45R17 in inches?

23.91 inches tall, 7.68 inches wide, on a 17-inch wheel. Written in inches, that is roughly 23.9×7.7R17.

What wheel width do I need for 195/45R17?

Manufacturers approve 6.0–7.5″ wide wheels for this size.

How many revolutions per mile does a 195/45R17 make?

Published figures run 869 revolutions per mile. The calculated figure is 843.5, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 195/45R17 than 215/40R17?

0.14 inches taller on paper (23.91″ vs 23.77″), which raises the axle about 0.07″. Your speedometer will read about 0.6% slow.