tireheight.com

215/50R18 in inches

A 215/50R18 tire is 26.5″ tall and 8.5″ wide, and fits a 18″ wheel. In inches it is written 26.5×8.5R18.

Diameter26.46″
Width8.46″
Sidewall4.23″
215/50R18 drawn to scale: 26.46 inch diameter, 4.23 inch sidewall, 18 inch wheel, 8.46 inch tread width18″ wheel4.23″26.46″ overall8.46″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 215/50R18 tires really are

Heights published by Michelin for all 2 tires in this size. Their published revolutions per mile work out to 25.7″ under load (below).

Real 215/50R18 tires measure 26.50″, against 26.46″ from the size code. Every one runs taller than the size code.

Height under load25.7″

Published revs per mile (785) mean the tire rolls like a 25.7″ tire on the vehicle. Use this for speedometer calibration.

2 tires in 215/50R18

Sort by the spec you care about.

LoadRevs/miSource
Michelin CrossClimate2All-seasonSL · 92V26.5024.510.01,389785Spec page
Michelin X-Ice SnowWinterSL · 92H26.5024.510.51,389785Spec page

Is 215/50R18 a 27-inch tire?

≈27″

Close. The size code works out to 26.46″, and the 2 tires here publish 26.50″, 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 215/50R18Difference
225/45R1825.97-0.49″-1.9%
255/40R1826.03-0.43″-1.6%
295/35R1826.13-0.33″-1.3%
235/45R1826.33-0.14″-0.5%
265/40R1826.35-0.12″-0.4%
305/35R1826.41-0.06″-0.2%
275/40R1826.66+0.20″+0.7%
245/45R1826.68+0.22″+0.8%
315/35R1826.68+0.22″+0.8%
225/50R1826.86+0.39″+1.5%

How to read 215/50R18

How to read any tire size

215/50R18 92V as printed on the tire sidewall, with each part numbered215/50R18 92V123456
How 215/50R18 92V is printed on the sidewall. It's the most common code among the 2 tires here (1 of them); tires in this size come in other load and speed ratings too.
1215Section width

215 mm across the widest point, or 8.46 inches. Every 215 size

250Aspect ratio

A percentage, not a measurement: the sidewall is 50% as tall as the tire is wide, which is 107.5 mm or 4.23 inches.

3RConstruction

Radial construction.

418Wheel diameter

Mounts on a 18-inch wheel. Approved wheel widths run 6.0″ to 7.5″.

592Load index

Each tire carries up to 1,389 lb (630 kg) at its maximum pressure.

6VSpeed rating

Rated for up to 149 mph sustained.

SpecificationInchesMetric
Overall diameter26.46672 mm
Section width8.46215 mm
Sidewall height4.23107.5 mm
Circumference83.12,112 mm
Revolutions per mile (calculated, unloaded)762.1474 per km
Revolutions per mile (published by manufacturers)785488 per km
Approved wheel width6.0–7.5152–191 mm

Speedometer error after switching to 215/50R18

Your actual speed– mph

Questions about 215/50R18

What is 215/50R18 in inches?

26.46 inches tall, 8.46 inches wide, on a 18-inch wheel. Written in inches, that is roughly 26.5×8.5R18.

How much does a 215/50R18 tire weigh?

Between 24.5 lb and 24.5 lb for the 2 tires listed here. The lightest is the Michelin CrossClimate2 (SL); the heaviest is the Michelin CrossClimate2 (SL).

What wheel width do I need for 215/50R18?

Manufacturers approve 6.0–7.5″ wide wheels for this size.

How many revolutions per mile does a 215/50R18 make?

Published figures run 785 revolutions per mile. The calculated figure is 762.1, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 215/50R18 than 305/35R18?

0.06 inches taller on paper (26.46″ vs 26.41″), which raises the axle about 0.03″. Your speedometer will read about 0.2% slow.