tireheight.com

225/45R16 in inches

A 225/45R16 tire is 24.0″ tall and 8.9″ wide, and fits a 16″ wheel. In inches it is written 24.0×8.9R16.

Diameter23.97″
Width8.86″
Sidewall3.99″
225/45R16 drawn to scale: 23.97 inch diameter, 3.99 inch sidewall, 16 inch wheel, 8.86 inch tread width16″ wheel3.99″23.97″ overall8.86″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 225/45R16 tires really are

Heights published by Toyo for all 3 tires in this size. Their published revolutions per mile work out to 23.2″ under load (below).

Real 225/45R16 tires measure 23.86–23.94″, against 23.97″ from the size code. Every one runs shorter than the size code.

  1. Toyo Proxes R888R23.94″ −0.04″
  2. Toyo Proxes Sport R23.90″ −0.07″
  3. Toyo Proxes R1R23.86″ −0.11″
Each bar runs from the size code's 23.97″ (the orange line) to the model's published height. The track spans 1.0″. Where a model comes in several load ranges, the darker part shows its range of heights; the number after the name is how many versions it comes in.
Height under load23.2″

Published revs per mile (868–871) mean the tire rolls like a 23.2″ tire on the vehicle. Use this for speedometer calibration.

Weight spread21.6–22.5 lb

The lightest (Toyo Proxes Sport R, XL) is 0.9 lb lighter per corner than the heaviest (Toyo Proxes R1R, SL).

3 tires in 225/45R16

Sort by the spec you care about.

LoadRevs/miSource
Toyo Proxes Sport RPerformanceXL · 93W23.9021.67.21,433868Spec page
Toyo Proxes R888RPerformanceXL · 93W23.9422.56.31,433868Spec page
Toyo Proxes R1RPerformanceSL · 89W23.8622.58.11,279871Spec page

Is 225/45R16 a 24-inch tire?

≈24″

Yes. The size code works out to 23.97″, and the 3 tires here publish 23.86–23.94″, so people call it a 24.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 225/45R16Difference
205/45R1623.26-0.71″-3.0%
215/45R1623.62-0.35″-1.5%
195/50R1623.68-0.30″-1.2%
195/45R1723.91-0.06″-0.3%
175/65R1523.96-0.02″-0.1%
185/55R1624.01+0.04″+0.2%
205/50R1624.07+0.10″+0.4%
195/55R1624.44+0.47″+2.0%
245/45R1624.68+0.71″+3.0%
185/60R1624.74+0.77″+3.2%

How to read 225/45R16

How to read any tire size

225/45R16 93W as printed on the tire sidewall, with each part numbered225/45R16 93W123456
How 225/45R16 93W is printed on the sidewall. It's the most common code among the 3 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

245Aspect ratio

A percentage, not a measurement: the sidewall is 45% as tall as the tire is wide, which is 101.3 mm or 3.99 inches.

3RConstruction

Radial construction.

416Wheel diameter

Mounts on a 16-inch wheel. Approved wheel widths run 7.0″ to 8.5″.

593Load index

Each tire carries up to 1,433 lb (650 kg) at its maximum pressure.

6WSpeed rating

Rated for up to 168 mph sustained.

XLExtra load

Printed after the size. In this size the XL tires carry up to 1,433 lb each and the standard-load tires up to 1,279 lb, as published.

SpecificationInchesMetric
Overall diameter23.97609 mm
Section width8.86225 mm
Sidewall height3.99101.3 mm
Circumference75.31,913 mm
Revolutions per mile (calculated, unloaded)841.3523 per km
Revolutions per mile (published by manufacturers)868–871539–541 per km
Approved wheel width7.0–8.5178–216 mm

Speedometer error after switching to 225/45R16

Your actual speed– mph

Questions about 225/45R16

What is 225/45R16 in inches?

23.97 inches tall, 8.86 inches wide, on a 16-inch wheel. Written in inches, that is roughly 24.0×8.9R16.

How much does a 225/45R16 tire weigh?

Between 21.6 lb and 22.5 lb for the 3 tires listed here. The lightest is the Toyo Proxes Sport R (XL); the heaviest is the Toyo Proxes R1R (SL).

What wheel width do I need for 225/45R16?

Manufacturers approve 7.0–8.5″ wide wheels for this size.

How many revolutions per mile does a 225/45R16 make?

Published figures run 868–871 revolutions per mile. The calculated figure is 841.3, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 225/45R16 than 195/50R16?

0.30 inches taller on paper (23.97″ vs 23.68″), which raises the axle about 0.15″. Your speedometer will read about 1.2% slow.