205/40R17 in inches

A 205/40R17 tire is 23.5″ tall and 8.1″ wide, and fits a 17″ wheel. In inches it is written 23.5×8.1R17.

Diameter23.46″

Width8.07″

Sidewall3.23″

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

Manufacturer data

How tall 205/40R17 tires really are

Heights published by BFGoodrich, General, Michelin and Toyo for all 5 tires in this size. Their published revolutions per mile work out to 22.7–22.8″ under load (below).

Real 205/40R17 tires measure 23.46–23.50″, against 23.46″ from the size code. They run both taller and shorter than the size code.

Height under load22.7–22.8″

Published revs per mile (885–887) mean the tire rolls like a 22.7–22.8″ tire on the vehicle. Use this for speedometer calibration.

Weight spread17.2–20.5 lb

The lightest (General G-MAX AS07, XL) is 3.3 lb lighter per corner than the heaviest (Toyo Proxes R888R, XL).

5 tires in 205/40R17

Sort by the spec you care about.

	Load					Revs/mi	Source
General G-MAX AS07Performance	XL · 84W	23.50	17.2	10.0	1,102	886	Spec page
Michelin Pilot Sport 5Performance	XL · 84(Y)	23.50	17.8	9.0	1,102	887	Spec page
Toyo Extensa HP IIPerformance	XL · 84W	23.46	19.0	9.1	1,102	885	Spec page
BFGoodrich g-Force Phenom T/APerformance	XL · 84Y	23.46	19.6	8.0	1,102	887	Spec page
Toyo Proxes R888RPerformance	XL · 84W	23.46	20.5	6.3	1,102	885	Spec page

Is 205/40R17 a 23-inch tire?

≈23″

Close. The size code works out to 23.46″, and the 5 tires here publish 23.46–23.50″, so people call it a 23.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

Size	Diameter ″	vs 205/40R17	Difference
205/45R16	23.26	-0.19″	-0.8%
215/45R16	23.62	+0.16″	+0.7%
195/50R16	23.68	+0.22″	+0.9%
245/35R17	23.75	+0.30″	+1.3%
215/40R17	23.77	+0.31″	+1.3%
195/45R17	23.91	+0.45″	+1.9%
215/35R18	23.93	+0.47″	+2.0%
205/45R17	24.26	+0.81″	+3.4%
235/40R17	24.40	+0.94″	+4.0%
215/45R17	24.62	+1.16″	+5.0%

How to read 205/40R17

How to read any tire size

How 205/40R17 84W is printed on the sidewall. It's the most common code among the 5 tires here (3 of them); tires in this size come in other load and speed ratings too.

1205Section width

205 mm across the widest point, or 8.07 inches. Every 205 size

240Aspect ratio

A percentage, not a measurement: the sidewall is 40% as tall as the tire is wide, which is 82.0 mm or 3.23 inches.

3RConstruction

Radial construction.

417Wheel diameter

Mounts on a 17-inch wheel. Approved wheel widths run 7.0″ to 8.0″.

584Load index

Each tire carries up to 1,102 lb (500 kg) at its maximum pressure.

6WSpeed rating

Rated for up to 168 mph sustained.

XLExtra load

Printed after the size.

Specification	Inches	Metric
Overall diameter	23.46	596 mm
Section width	8.07	205 mm
Sidewall height	3.23	82.0 mm
Circumference	73.7	1,872 mm
Revolutions per mile (calculated, unloaded)	859.8	534 per km
Revolutions per mile (published by manufacturers)	885–887	550–551 per km
Approved wheel width	7.0–8.0	178–203 mm

Speedometer error after switching to 205/40R17

Your actual speed– mph

Questions about 205/40R17

What is 205/40R17 in inches?

23.46 inches tall, 8.07 inches wide, on a 17-inch wheel. Written in inches, that is roughly 23.5×8.1R17.

How much does a 205/40R17 tire weigh?

Between 17.2 lb and 20.5 lb for the 5 tires listed here. The lightest is the General G-MAX AS07 (XL); the heaviest is the Toyo Proxes R888R (XL).

What wheel width do I need for 205/40R17?

Manufacturers approve 7.0–8.0″ wide wheels for this size.

How many revolutions per mile does a 205/40R17 make?

Published figures run 885–887 revolutions per mile. The calculated figure is 859.8, but manufacturers measure the tire under load, where it rolls on a smaller radius.