tireheight.com

245/40R15 in inches

A 245/40R15 tire is 22.7″ tall and 9.6″ wide, and fits a 15″ wheel. In inches it is written 22.7×9.6R15.

Diameter22.72″
Width9.65″
Sidewall3.86″
245/40R15 drawn to scale: 22.72 inch diameter, 3.86 inch sidewall, 15 inch wheel, 9.65 inch tread width15″ wheel3.86″22.72″ overall9.65″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 245/40R15 tires really are

Heights published by BFGoodrich and Toyo for all 5 tires in this size. Their published revolutions per mile work out to 22.0–22.1″ under load (below).

Real 245/40R15 tires measure 22.68–22.72″, against 22.72″ from the size code. They run both taller and shorter than the size code.

Height under load22.0–22.1″

Published revs per mile (914–915) mean the tire rolls like a 22.0–22.1″ tire on the vehicle. Use this for speedometer calibration.

Weight spread20.5–23.9 lb

The lightest (Toyo Proxes RR, SL) is 3.4 lb lighter per corner than the heaviest (BFGoodrich g-Force Rival S, SL).

5 tires in 245/40R15

Sort by the spec you care about.

LoadRevs/miSource
Toyo Proxes RRPerformanceSL22.7220.53.61,235914Spec page
Toyo Proxes RPerformanceSL · 88W22.7020.83.71,235914Spec page
Toyo Proxes Sport RPerformanceSL · 88W22.7022.87.21,235914Spec page
BFGoodrich g-Force Rival SPerformanceSL · 88V22.6823.97.21,235915Spec page
BFGoodrich g-Force Rival+PerformanceSL · 88V22.7223.97.21,235915Spec page

Is 245/40R15 a 23-inch tire?

≈23″

Yes. The size code works out to 22.72″, and the 5 tires here publish 22.68–22.72″, so people call it a 23.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 245/40R15Difference
195/45R1521.91-0.81″-3.6%
195/50R1522.68-0.04″-0.2%
185/60R1422.74+0.02″+0.1%
195/45R1622.91+0.19″+0.8%
175/65R1422.96+0.24″+1.1%
225/45R1522.97+0.26″+1.1%
185/55R1523.01+0.30″+1.3%
205/50R1523.07+0.35″+1.6%
195/55R1523.44+0.73″+3.2%
185/60R1523.74+1.02″+4.5%

How to read 245/40R15

How to read any tire size

245/40R15 88V as printed on the tire sidewall, with each part numbered245/40R15 88V123456
How 245/40R15 88V is printed on the sidewall. It's the most common code among the 5 tires here (2 of them); tires in this size come in other load and speed ratings too.
1245Section width

245 mm across the widest point, or 9.65 inches. Every 245 size

240Aspect ratio

A percentage, not a measurement: the sidewall is 40% as tall as the tire is wide, which is 98.0 mm or 3.86 inches.

3RConstruction

Radial construction.

415Wheel diameter

Mounts on a 15-inch wheel. Approved wheel widths run 8.0″ to 9.5″.

588Load index

Each tire carries up to 1,235 lb (560 kg) at its maximum pressure.

6VSpeed rating

Rated for up to 149 mph sustained.

SpecificationInchesMetric
Overall diameter22.72577 mm
Section width9.65245 mm
Sidewall height3.8698.0 mm
Circumference71.41,813 mm
Revolutions per mile (calculated, unloaded)887.8552 per km
Revolutions per mile (published by manufacturers)914–915568–569 per km
Approved wheel width8.0–9.5203–241 mm

Speedometer error after switching to 245/40R15

Your actual speed– mph

Questions about 245/40R15

What is 245/40R15 in inches?

22.72 inches tall, 9.65 inches wide, on a 15-inch wheel. Written in inches, that is roughly 22.7×9.6R15.

How much does a 245/40R15 tire weigh?

Between 20.5 lb and 23.9 lb for the 5 tires listed here. The lightest is the Toyo Proxes RR (SL); the heaviest is the BFGoodrich g-Force Rival S (SL).

What wheel width do I need for 245/40R15?

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

How many revolutions per mile does a 245/40R15 make?

Published figures run 914–915 revolutions per mile. The calculated figure is 887.8, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 245/40R15 than 195/50R15?

0.04 inches taller on paper (22.72″ vs 22.68″), which raises the axle about 0.02″. Your speedometer will read about 0.2% slow.