tireheight.com

255/35R18 in inches

A 255/35R18 tire is 25.0″ tall and 10.0″ wide, and fits a 18″ wheel. In inches it is written 25.0×10.0R18.

Diameter25.03″
Width10.04″
Sidewall3.51″
255/35R18 drawn to scale: 25.03 inch diameter, 3.51 inch sidewall, 18 inch wheel, 10.04 inch tread width18″ wheel3.51″25.03″ overall10.04″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 255/35R18 tires really are

Heights published by BFGoodrich, General, Michelin and Toyo for all 18 tires in this size. Their published revolutions per mile work out to 24.2–24.4″ under load (below).

Real 255/35R18 tires measure 25.00–25.10″, against 25.03″ from the size code. Most run shorter than the size code (16 of 18).

Height under load24.2–24.4″

Published revs per mile (828–832) mean the tire rolls like a 24.2–24.4″ tire on the vehicle. Use this for speedometer calibration.

Weight spread22.0–27.9 lb

The lightest (General G-MAX RS, XL) is 5.9 lb lighter per corner than the heaviest (BFGoodrich g-Force COMP-2 A/S PLUS, XL).

18 tires in 255/35R18

Sort by the spec you care about.

LoadRevs/miSource
General G-MAX RSPerformanceXL · 94Y25.0022.010.01,477830Spec page
Toyo Proxes RPerformanceSL · 90W25.0023.03.61,323831Spec page
Toyo Proxes Sport 2PerformanceXL · 94Y25.0023.19.21,477831Spec page
General G-MAX AS07PerformanceXL · 94W25.0023.410.01,477830Spec page
Toyo Proxes R1RPerformanceSL · 90W25.0823.68.21,323828Spec page
Michelin Pilot Sport 4 SPerformanceXL · 94(Y)25.0023.78.51,477832Spec page
Michelin Pilot Sport 4 SPerformanceXL · 94(Y)25.0024.09.51,477832Spec page
Michelin X-Ice SnowWinterXL · 94H25.0024.010.51,477832Spec page
Toyo Extensa HP IIPerformanceXL · 94W25.0024.59.71,477831Spec page
Michelin Pilot Sport All-Season 4PerformanceXL · 94Y25.1025.010.01,477830Spec page
Toyo Proxes R888RPerformanceXL · 94Y25.0025.26.31,477831Spec page
Toyo Proxes Sport A/SPerformanceXL · 94Y25.0025.39.41,477831Spec page
Michelin CrossClimate2All-seasonXL · 94V25.0025.610.01,477832Spec page
Toyo Celsius SportPerformanceSL · 94Y25.0025.69.01,477831Spec page
Toyo Proxes Sport RPerformanceXL · 94W25.0025.67.21,477831Spec page
BFGoodrich g-Force Phenom T/APerformanceXL · 94W25.0025.79.01,477832Spec page
Michelin Pilot Alpin PA4WinterXL · 94V25.0025.810.51,477832Spec page
BFGoodrich g-Force COMP-2 A/S PLUSPerformanceXL · 94W25.0027.99.01,477832Spec page

Is 255/35R18 a 25-inch tire?

≈25″

Yes. The size code works out to 25.03″, and the 18 tires here publish 25.00–25.10″, so people call it a 25.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 255/35R18Difference
205/40R1824.46-0.57″-2.3%
285/30R1824.73-0.30″-1.2%
245/35R1824.75-0.28″-1.1%
215/40R1824.77-0.26″-1.0%
295/30R1824.97-0.06″-0.2%
225/40R1825.09+0.06″+0.2%
265/35R1825.30+0.28″+1.1%
235/40R1825.40+0.37″+1.5%
315/30R1825.44+0.41″+1.7%
275/35R1825.58+0.55″+2.2%

How to read 255/35R18

How to read any tire size

255/35R18 94W as printed on the tire sidewall, with each part numbered255/35R18 94W123456
How 255/35R18 94W is printed on the sidewall. It's the most common code among the 18 tires here (5 of them); tires in this size come in other load and speed ratings too.
1255Section width

255 mm across the widest point, or 10.04 inches. Every 255 size

235Aspect ratio

A percentage, not a measurement: the sidewall is 35% as tall as the tire is wide, which is 89.3 mm or 3.51 inches.

3RConstruction

Radial construction.

418Wheel diameter

Mounts on a 18-inch wheel. Approved wheel widths run 8.5″ to 10.0″.

594Load index

Each tire carries up to 1,477 lb (670 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 1,477 lb each and the standard-load tires up to 1,477 lb, as published.

SpecificationInchesMetric
Overall diameter25.03636 mm
Section width10.04255 mm
Sidewall height3.5189.3 mm
Circumference78.61,997 mm
Revolutions per mile (calculated, unloaded)805.8501 per km
Revolutions per mile (published by manufacturers)828–832514–517 per km
Approved wheel width8.5–10.0216–254 mm

Speedometer error after switching to 255/35R18

Your actual speed– mph

Questions about 255/35R18

What is 255/35R18 in inches?

25.03 inches tall, 10.04 inches wide, on a 18-inch wheel. Written in inches, that is roughly 25.0×10.0R18.

How much does a 255/35R18 tire weigh?

Between 22.0 lb and 27.9 lb for the 18 tires listed here. The lightest is the General G-MAX RS (XL); the heaviest is the BFGoodrich g-Force COMP-2 A/S PLUS (XL).

What wheel width do I need for 255/35R18?

Manufacturers approve 8.5–10.0″ wide wheels for this size.

How many revolutions per mile does a 255/35R18 make?

Published figures run 828–832 revolutions per mile. The calculated figure is 805.8, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 255/35R18 than 295/30R18?

0.06 inches taller on paper (25.03″ vs 24.97″), which raises the axle about 0.03″. Your speedometer will read about 0.2% slow.