tiresizeinches.com

Metric tire size · 18 in wheel

325/65R18 tire size in inches and millimeters

mm, 115–395
% of width
inches

Reading 325/65R18. Change any field and the gauge follows.

Overall diameter

34.63in

A 325/65R18 tire stands 34.63 in (879.7 mm) tall, which makes it a 35-inch tire by diameter, 0.37 in under.

Section width
12.80 in325 mm
Sidewall
8.32 in211.2 mm
Wheel
18 in457.2 mm
325/65R18 drawn to scaleA 325/65R18 tire drawn to scale, seen from the side and head-on at one scale. Four dimension lines label the overall diameter 34.63 in, the wheel diameter 18 in, the sidewall height 8.32 in and the section width 12.80 in. Every one of those values is stated in text on this page.34.63 in18 in wheel8.32 in12.80 in
Drawn to scale. Hover or focus a row in the equivalents table to lay that size over this one.

Full specification

325/65R18 — one measurement per row, in both unit systems
Dimension Inchesin Millimetersmm
Overall diameter34.63879.7
Section width12.80325.0
Sidewall height8.32211.2
Wheel diameter18.00457.2
Circumference108.812,763.7
325/65R18 — the quantities that are not one measurement in two units
QuantityValueUnit
Revolutions582.3per mile
Revolutions361.8per kilometer
Aspect ratio65% of section width
ConstructionRradial

Sizes that will do the same job

Where every equivalent size falls inside the tolerance bandA horizontal scale running from three percent under to three percent over the 325/65R18 overall diameter of 34.63 in. Each of the 10 sizes in the table is drawn as a tick at its own difference; the pointer marks 305/70R18 at +0.51%. Every plotted value is a row of the table below.−3−2−10123SHORTERTALLER305/70R18 · +0.51%
The scale is percent difference in overall diameter against 34.63 in. Every mark is a row of the table below, at its own distance from it.

10 sizes in this table are within ±3% of 34.63 in. A positive difference is taller than 325/65R18; every sign is printed as well as colored.

The most searched equivalents of 325/65R18, 10 listed, sorted by how far each is from 34.63 in. Open a row for its section width and speed.
Size Overall diameterin Difference vs 325/65R18% of diameter, then inches Actual speedmph at an indicated 60
34.81 +0.51% +0.18 in 60.3
34.83 +0.57% +0.20 in 60.3
34.26 −1.08% −0.37 in 59.4
34.24 −1.14% −0.39 in 59.3
35.32 +1.99% +0.69 in 61.2
35.36 +2.10% +0.73 in 61.3
35.42 +2.27% +0.79 in 61.4
33.71 −2.67% −0.93 in 58.4
33.65 −2.84% −0.98 in 58.3
33.61 −2.96% −1.02 in 58.2

The next sizes up and down

One width step and one profile step either side of 325/65R18, on the same wheel.
Size Overall diameterdifference % and inches Section widthvs 325/65R18, then mph at an indicated 60
narrower315/65R18 34.12−1.48% −0.51 in −0.39 in59.1 mph actual
wider335/65R18 35.15+1.48% +0.51 in +0.39 in60.9 mph actual
lower profile325/60R18 33.35−3.69% −1.28 in 0.00 in57.8 mph actual
taller profile325/70R18 35.91+3.69% +1.28 in 0.00 in62.2 mph actual