tireheight.com

225/50R18 in inches

A 225/50R18 tire is 26.9″ tall and 8.9″ wide, and fits a 18″ wheel. In inches it is written 26.9×8.9R18.

Diameter26.86″
Width8.86″
Sidewall4.43″
225/50R18 drawn to scale: 26.86 inch diameter, 4.43 inch sidewall, 18 inch wheel, 8.86 inch tread width18″ wheel4.43″26.86″ overall8.86″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 225/50R18 tires really are

Heights published by BFGoodrich, General, Michelin and Toyo for all 22 tires in this size. Their published revolutions per mile work out to 26.1″ under load (below).

Real 225/50R18 tires measure 26.89–26.90″, against 26.86″ from the size code. Every one runs taller than the size code.

Height under load26.1″

Published revs per mile (773–774) mean the tire rolls like a 26.1″ tire on the vehicle. Use this for speedometer calibration.

Weight spread22.5–29.5 lb

The lightest (General AltiMAX RT45, SL) is 7.0 lb lighter per corner than the heaviest (Michelin Pilot Alpin PA4, SL).

22 tires in 225/50R18

Sort by the spec you care about.

LoadRevs/miSource
General AltiMAX RT45TouringSL · 95T26.9022.511.01,521773Spec page
General AltiMAX RT45TouringSL · 95H26.9022.511.01,521773Spec page
General AltiMAX365 AWTouringSL · 95H26.9022.511.01,521773Spec page
General AltiMAX RT45TouringXL · 99V26.9024.011.01,709773Spec page
General G-MAX AS07PerformanceSL · 95W26.9024.410.01,521773Spec page
Toyo Extensa A/S IIAll-seasonSL · 95H26.8924.710.81,521773Spec page
Toyo Proxes Sport A/SPerformanceSL · 95W26.8925.09.81,521773Spec page
Michelin CrossClimate2All-seasonSL · 95H26.9025.410.01,521774Spec page
Toyo Extensa HP IIPerformanceXL · 99W26.8925.79.31,709773Spec page
Michelin X-Ice Snow+WinterXL · 99H26.8925.810.51,709774Spec page
Michelin Defender2All-seasonXL · 99V26.8925.910.51,709774Spec page
Michelin X-Ice SnowWinterXL · 99H26.8926.110.51,709774Spec page
Michelin Pilot Sport All-Season 4PerformanceXL · 99Y26.9026.210.01,709774Spec page
General AltiMAX Arctic XWinterXL · 99T26.9026.512.01,709773Spec page
Toyo Proxes G-TourXL · 99V26.9026.79.21,709773Spec page
BFGoodrich Advantage ControlAll-seasonXL · 99W26.8926.910.51,709774Spec page
BFGoodrich Advantage ControlAll-seasonSL · 95H26.8927.111.51,521774Spec page
BFGoodrich g-Force Phenom T/APerformanceXL · 99W26.8927.29.01,709774Spec page
Toyo Celsius SportPerformanceSL · 95V26.8927.810.21,521773Spec page
BFGoodrich g-Force COMP-2 A/S PLUSPerformanceXL · 99W26.8928.29.01,521774Spec page
Toyo Celsius IITouringSL · 95V26.8928.311.11,521773Spec page
Michelin Pilot Alpin PA4WinterSL · 95H26.8929.510.51,521774Spec page

Is 225/50R18 a 27-inch tire?

≈27″

Yes. The size code works out to 26.86″, and the 22 tires here publish 26.89–26.90″, so people call it a 27.

All 27-inch tire sizes, on every wheel size.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 225/50R18Difference
265/40R1826.35-0.51″-1.9%
305/35R1826.41-0.45″-1.7%
215/50R1826.46-0.39″-1.5%
275/40R1826.66-0.20″-0.7%
245/45R1826.68-0.18″-0.7%
315/35R1826.68-0.18″-0.7%
285/40R1826.98+0.12″+0.4%
255/45R1827.04+0.18″+0.7%
235/50R1827.25+0.39″+1.5%
215/55R1827.31+0.45″+1.7%

How to read 225/50R18

How to read any tire size

225/50R18 95H as printed on the tire sidewall, with each part numbered225/50R18 95H123456
How 225/50R18 95H is printed on the sidewall. It's the most common code among the 22 tires here (6 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.

418Wheel diameter

Mounts on a 18-inch wheel. Approved wheel widths run 6.0″ to 8.0″.

595Load index

Each tire carries up to 1,521 lb (690 kg) at its maximum pressure.

6HSpeed rating

Rated for up to 130 mph sustained.

SpecificationInchesMetric
Overall diameter26.86682 mm
Section width8.86225 mm
Sidewall height4.43112.5 mm
Circumference84.42,143 mm
Revolutions per mile (calculated, unloaded)750.9467 per km
Revolutions per mile (published by manufacturers)773–774480–481 per km
Approved wheel width6.0–8.0152–203 mm

Speedometer error after switching to 225/50R18

Your actual speed– mph

Questions about 225/50R18

What is 225/50R18 in inches?

26.86 inches tall, 8.86 inches wide, on a 18-inch wheel. Written in inches, that is roughly 26.9×8.9R18.

How much does a 225/50R18 tire weigh?

Between 22.5 lb and 29.5 lb for the 22 tires listed here. The lightest is the General AltiMAX RT45 (SL); the heaviest is the Michelin Pilot Alpin PA4 (SL).

What wheel width do I need for 225/50R18?

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

How many revolutions per mile does a 225/50R18 make?

Published figures run 773–774 revolutions per mile. The calculated figure is 750.9, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 225/50R18 than 315/35R18?

0.18 inches taller on paper (26.86″ vs 26.68″), which raises the axle about 0.09″. Your speedometer will read about 0.7% slow.