tireheight.com

235/40R17 in inches

A 235/40R17 tire is 24.4″ tall and 9.3″ wide, and fits a 17″ wheel. In inches it is written 24.4×9.3R17.

Diameter24.40″
Width9.25″
Sidewall3.70″
235/40R17 drawn to scale: 24.40 inch diameter, 3.70 inch sidewall, 17 inch wheel, 9.25 inch tread width17″ wheel3.70″24.40″ overall9.25″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 235/40R17 tires really are

Heights published by Toyo for all 7 tires in this size. Their published revolutions per mile work out to 23.7″ under load (below).

Real 235/40R17 tires measure 24.40–24.45″, against 24.40″ from the size code. They run both taller and shorter than the size code.

Height under load23.7″

Published revs per mile (850–852) mean the tire rolls like a 23.7″ tire on the vehicle. Use this for speedometer calibration.

Weight spread21.5–24.0 lb

The lightest (Toyo Proxes R, SL) is 2.5 lb lighter per corner than the heaviest (Toyo Proxes RA1, SL).

7 tires in 235/40R17

Sort by the spec you care about.

LoadRevs/miSource
Toyo Proxes RPerformanceSL · 90W24.4121.53.61,323851Spec page
Toyo Proxes RRPerformanceSL24.4122.13.61,323851Spec page
Toyo Proxes Sport A/SPerformanceXL · 94Y24.4122.89.31,477851Spec page
Toyo Proxes R888RPerformanceSL · 94W24.4123.16.31,477851Spec page
Toyo Proxes Sport RPerformanceSL · 90W24.4023.67.21,323851Spec page
Toyo Proxes R1RPerformanceSL · 90W24.4523.88.21,323850Spec page
Toyo Proxes RA1PerformanceSL24.4024.08.01,323852Spec page

Is 235/40R17 a 24-inch tire?

≈24″

Close. The size code works out to 24.40″, and the 7 tires here publish 24.40–24.45″, so people call it a 24.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 235/40R17Difference
245/35R1723.75-0.65″-2.7%
215/40R1723.77-0.63″-2.6%
195/45R1723.91-0.49″-2.0%
205/45R1724.26-0.14″-0.6%
195/55R1624.44+0.04″+0.2%
215/45R1724.62+0.22″+0.9%
245/40R1724.72+0.31″+1.3%
225/45R1724.97+0.57″+2.3%
255/40R1725.03+0.63″+2.6%
205/50R1725.07+0.67″+2.7%

How to read 235/40R17

How to read any tire size

235/40R17 90W as printed on the tire sidewall, with each part numbered235/40R17 90W123456
How 235/40R17 90W is printed on the sidewall. It's the most common code among the 7 tires here (3 of them); tires in this size come in other load and speed ratings too.
1235Section width

235 mm across the widest point, or 9.25 inches. Every 235 size

240Aspect ratio

A percentage, not a measurement: the sidewall is 40% as tall as the tire is wide, which is 94.0 mm or 3.70 inches.

3RConstruction

Radial construction.

417Wheel diameter

Mounts on a 17-inch wheel. Approved wheel widths run 8.0″ to 9.5″.

590Load index

Each tire carries up to 1,323 lb (600 kg) at its maximum pressure.

6WSpeed rating

Rated for up to 168 mph sustained.

SpecificationInchesMetric
Overall diameter24.40620 mm
Section width9.25235 mm
Sidewall height3.7094.0 mm
Circumference76.71,947 mm
Revolutions per mile (calculated, unloaded)826.5514 per km
Revolutions per mile (published by manufacturers)850–852528–529 per km
Approved wheel width8.0–9.5203–241 mm

Speedometer error after switching to 235/40R17

Your actual speed– mph

Questions about 235/40R17

What is 235/40R17 in inches?

24.40 inches tall, 9.25 inches wide, on a 17-inch wheel. Written in inches, that is roughly 24.4×9.3R17.

How much does a 235/40R17 tire weigh?

Between 21.5 lb and 24.0 lb for the 7 tires listed here. The lightest is the Toyo Proxes R (SL); the heaviest is the Toyo Proxes RA1 (SL).

What wheel width do I need for 235/40R17?

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

How many revolutions per mile does a 235/40R17 make?

Published figures run 850–852 revolutions per mile. The calculated figure is 826.5, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 235/40R17 than 205/45R17?

0.14 inches taller on paper (24.40″ vs 24.26″), which raises the axle about 0.07″. Your speedometer will read about 0.6% slow.