tireheight.com

225/50R15 in inches

A 225/50R15 tire is 23.9″ tall and 8.9″ wide, and fits a 15″ wheel. In inches it is written 23.9×8.9R15.

Diameter23.86″
Width8.86″
Sidewall4.43″
225/50R15 drawn to scale: 23.86 inch diameter, 4.43 inch sidewall, 15 inch wheel, 8.86 inch tread width15″ wheel4.43″23.86″ overall8.86″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 225/50R15 tires really are

Heights published by Toyo for all 4 tires in this size. Their published revolutions per mile work out to 23.2″ under load (below).

Real 225/50R15 tires measure 23.90–23.90″, against 23.86″ from the size code. Every one runs taller than the size code.

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.

Weight spread20.8–23.0 lb

The lightest (Toyo Proxes R, SL) is 2.2 lb lighter per corner than the heaviest (Toyo Proxes RA1, SL).

4 tires in 225/50R15

Sort by the spec you care about.

LoadRevs/miSource
Toyo Proxes RPerformanceSL · 91W23.9020.83.61,356869Spec page
Toyo Proxes RRPerformanceSL23.9021.63.61,356869Spec page
Toyo Proxes R888RPerformanceSL · 91W23.9022.96.31,356869Spec page
Toyo Proxes RA1PerformanceSL23.9023.08.01,323869Spec page

Is 225/50R15 a 24-inch tire?

≈24″

Yes. The size code works out to 23.86″, and the 4 tires here publish 23.90″, so people call it a 24.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 225/50R15Difference
185/55R1523.01-0.85″-3.5%
205/50R1523.07-0.79″-3.3%
195/55R1523.44-0.41″-1.7%
185/60R1523.74-0.12″-0.5%
175/65R1523.96+0.10″+0.4%
225/45R1623.97+0.11″+0.5%
195/60R1524.21+0.35″+1.5%
235/50R1524.25+0.39″+1.7%
185/65R1524.47+0.61″+2.6%
205/60R1524.69+0.83″+3.5%

How to read 225/50R15

How to read any tire size

225/50R15 91W as printed on the tire sidewall, with each part numbered225/50R15 91W123456
How 225/50R15 91W is printed on the sidewall. It's the most common code among the 4 tires here (2 of them); tires in this size come in other load and speed ratings too.
1225Section width

225 mm across the widest point, or 8.86 inches. Every 225 size

250Aspect ratio

A percentage, not a measurement: the sidewall is 50% as tall as the tire is wide, which is 112.5 mm or 4.43 inches.

3RConstruction

Radial construction.

415Wheel diameter

Mounts on a 15-inch wheel. Approved wheel widths run 6.0″ to 8.0″.

591Load index

Each tire carries up to 1,356 lb (615 kg) at its maximum pressure.

6WSpeed rating

Rated for up to 168 mph sustained.

SpecificationInchesMetric
Overall diameter23.86606 mm
Section width8.86225 mm
Sidewall height4.43112.5 mm
Circumference75.01,904 mm
Revolutions per mile (calculated, unloaded)845.3525 per km
Revolutions per mile (published by manufacturers)869540 per km
Approved wheel width6.0–8.0152–203 mm

Speedometer error after switching to 225/50R15

Your actual speed– mph

Questions about 225/50R15

What is 225/50R15 in inches?

23.86 inches tall, 8.86 inches wide, on a 15-inch wheel. Written in inches, that is roughly 23.9×8.9R15.

How much does a 225/50R15 tire weigh?

Between 20.8 lb and 23.0 lb for the 4 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 225/50R15?

Manufacturers approve 6.0–8.0″ wide wheels for this size.

How many revolutions per mile does a 225/50R15 make?

Published figures run 869 revolutions per mile. The calculated figure is 845.3, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 225/50R15 than 185/60R15?

0.12 inches taller on paper (23.86″ vs 23.74″), which raises the axle about 0.06″. Your speedometer will read about 0.5% slow.