tireheight.com

335/30R18 in inches

A 335/30R18 tire is 25.9″ tall and 13.2″ wide, and fits a 18″ wheel. In inches it is written 25.9×13.2R18.

Diameter25.91″
Width13.19″
Sidewall3.96″
335/30R18 drawn to scale: 25.91 inch diameter, 3.96 inch sidewall, 18 inch wheel, 13.19 inch tread width18″ wheel3.96″25.91″ overall13.19″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 335/30R18 tires really are

Heights published by BFGoodrich and Toyo for all 4 tires in this size. Their published revolutions per mile work out to 25.1–25.2″ under load (below).

Real 335/30R18 tires measure 25.90–25.94″, against 25.91″ from the size code. Most run taller than the size code (3 of 4).

Height under load25.1–25.2″

Published revs per mile (801–802) mean the tire rolls like a 25.1–25.2″ tire on the vehicle. Use this for speedometer calibration.

Weight spread32.6–33.5 lb

The lightest (Toyo Proxes R888R, SL) is 0.9 lb lighter per corner than the heaviest (BFGoodrich g-Force Rival S, SL).

4 tires in 335/30R18

Sort by the spec you care about.

LoadRevs/miSource
Toyo Proxes R888RPerformanceSL · 102Y25.9432.66.31,874801Spec page
Toyo Proxes Sport RPerformanceSL · 102W25.9033.37.21,874801Spec page
BFGoodrich g-Force Rival SPerformanceSL · 95W25.9433.57.21,521802Spec page
BFGoodrich g-Force Rival+PerformanceSL · 95W25.9433.57.21,356802Spec page

Is 335/30R18 a 26-inch tire?

≈26″

Yes. The size code works out to 25.91″, and the 4 tires here publish 25.90–25.94″, so people call it a 26.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 335/30R18Difference
315/30R1825.44-0.47″-1.8%
275/35R1825.58-0.33″-1.3%
215/45R1825.62-0.30″-1.1%
245/40R1825.72-0.20″-0.8%
285/35R1825.85-0.06″-0.2%
225/45R1825.97+0.06″+0.2%
255/40R1826.03+0.12″+0.5%
295/35R1826.13+0.22″+0.8%
235/45R1826.33+0.41″+1.6%
265/40R1826.35+0.43″+1.7%

How to read 335/30R18

How to read any tire size

P335/30R18 95W as printed on the tire sidewall, with each part numberedP335/30R18 95W1234567
How P335/30R18 95W 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.
1PP-metric

Marks a P-metric (passenger) tire. Sizes with no letter are Euro-metric.

2335Section width

335 mm across the widest point, or 13.19 inches. Every 335 size

330Aspect ratio

A percentage, not a measurement: the sidewall is 30% as tall as the tire is wide, which is 100.5 mm or 3.96 inches.

4RConstruction

Radial construction.

518Wheel diameter

Mounts on a 18-inch wheel. Approved wheel widths run 11.5″ to 12.5″.

695Load index

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

7WSpeed rating

Rated for up to 168 mph sustained.

SpecificationInchesMetric
Overall diameter25.91658 mm
Section width13.19335 mm
Sidewall height3.96100.5 mm
Circumference81.42,068 mm
Revolutions per mile (calculated, unloaded)778.3484 per km
Revolutions per mile (published by manufacturers)801–802498 per km
Approved wheel width11.5–12.5292–318 mm

Speedometer error after switching to 335/30R18

Your actual speed– mph

Questions about 335/30R18

What is 335/30R18 in inches?

25.91 inches tall, 13.19 inches wide, on a 18-inch wheel. Written in inches, that is roughly 25.9×13.2R18.

How much does a 335/30R18 tire weigh?

Between 32.6 lb and 33.5 lb for the 4 tires listed here. The lightest is the Toyo Proxes R888R (SL); the heaviest is the BFGoodrich g-Force Rival S (SL).

What wheel width do I need for 335/30R18?

Manufacturers approve 11.5–12.5″ wide wheels for this size.

How many revolutions per mile does a 335/30R18 make?

Published figures run 801–802 revolutions per mile. The calculated figure is 778.3, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 335/30R18 than 285/35R18?

0.06 inches taller on paper (25.91″ vs 25.85″), which raises the axle about 0.03″. Your speedometer will read about 0.2% slow.