tireheight.com

245/35R18 in inches

A 245/35R18 tire is 24.8″ tall and 9.6″ wide, and fits a 18″ wheel. In inches it is written 24.8×9.6R18.

Diameter24.75″
Width9.65″
Sidewall3.38″
245/35R18 drawn to scale: 24.75 inch diameter, 3.38 inch sidewall, 18 inch wheel, 9.65 inch tread width18″ wheel3.38″24.75″ overall9.65″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 245/35R18 tires really are

Heights published by BFGoodrich, General, Michelin and Toyo for all 9 tires in this size. Their published revolutions per mile work out to 24.0–24.2″ under load (below).

Real 245/35R18 tires measure 24.50–25.00″, against 24.75″ from the size code. They run both taller and shorter than the size code.

  1. Michelin Pilot Sport All-Season 425.00″ +0.25″
  2. General G-MAX RS24.80″ +0.05″
  3. Michelin Pilot Sport 4 S24.80″ +0.05″
  4. Michelin Pilot Sport Cup 2 Connect24.80″ +0.05″
  5. Toyo Proxes Sport 224.80″ +0.05″
  6. Toyo Proxes Sport A/S24.76″ +0.01″
  7. Toyo Proxes Sport24.76″ +0.01″
  8. BFGoodrich g-Force Phenom T/A24.76″ +0.01″
  9. Michelin Pilot Super Sport24.50″ −0.25″
Each bar runs from the size code's 24.75″ (the orange line) to the model's published height. The track spans 1.0″. Where a model comes in several load ranges, the darker part shows its range of heights; the number after the name is how many versions it comes in.
Height under load24.0–24.2″

Published revs per mile (832–840) mean the tire rolls like a 24.0–24.2″ tire on the vehicle. Use this for speedometer calibration.

Weight spread20.7–25.3 lb

The lightest (General G-MAX RS, XL) is 4.6 lb lighter per corner than the heaviest (BFGoodrich g-Force Phenom T/A, XL).

9 tires in 245/35R18

Sort by the spec you care about.

LoadRevs/miSource
General G-MAX RSPerformanceXL · 92Y24.8020.710.01,389839Spec page
Michelin Pilot Sport Cup 2 ConnectPerformanceXL · 92(Y)24.8020.87.21,389840Spec page
Toyo Proxes Sport 2PerformanceXL · 92Y24.8022.09.11,389839Spec page
Michelin Pilot Super SportPerformanceXL · 92Y24.5022.39.01,389840Spec page
Michelin Pilot Sport 4 SPerformanceXL · 92(Y)24.8022.49.51,389840Spec page
Toyo Proxes SportPerformanceXL · 92Y24.7623.19.41,389839Spec page
Toyo Proxes Sport A/SPerformanceXL · 92Y24.7623.59.31,389839Spec page
Michelin Pilot Sport All-Season 4PerformanceXL · 92Y25.0025.010.01,389832Spec page
BFGoodrich g-Force Phenom T/APerformanceXL · 92W24.7625.39.01,389840Spec page

Is 245/35R18 a 25-inch tire?

≈25″

Yes. The size code works out to 24.75″, and the 9 tires here publish 24.50–25.00″, so people call it a 25.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 245/35R18Difference
205/40R1824.46-0.30″-1.2%
245/40R1724.72-0.04″-0.1%
285/30R1824.73-0.02″-0.1%
215/40R1824.77+0.02″+0.1%
295/30R1824.97+0.22″+0.9%
255/35R1825.03+0.28″+1.1%
225/40R1825.09+0.33″+1.4%
265/35R1825.30+0.55″+2.2%
235/40R1825.40+0.65″+2.6%
315/30R1825.44+0.69″+2.8%

How to read 245/35R18

How to read any tire size

245/35R18 92Y as printed on the tire sidewall, with each part numbered245/35R18 92Y123456
How 245/35R18 92Y is printed on the sidewall. It's the most common code among the 9 tires here (6 of them); tires in this size come in other load and speed ratings too.
1245Section width

245 mm across the widest point, or 9.65 inches. Every 245 size

235Aspect ratio

A percentage, not a measurement: the sidewall is 35% as tall as the tire is wide, which is 85.8 mm or 3.38 inches.

3RConstruction

Radial construction.

418Wheel diameter

Mounts on a 18-inch wheel. Approved wheel widths run 8.0″ to 9.5″.

592Load index

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

6YSpeed rating

Rated for up to 186 mph sustained.

XLExtra load

Printed after the size.

SpecificationInchesMetric
Overall diameter24.75629 mm
Section width9.65245 mm
Sidewall height3.3885.8 mm
Circumference77.81,975 mm
Revolutions per mile (calculated, unloaded)814.8506 per km
Revolutions per mile (published by manufacturers)832–840517–522 per km
Approved wheel width8.0–9.5203–241 mm

Speedometer error after switching to 245/35R18

Your actual speed– mph

Questions about 245/35R18

What is 245/35R18 in inches?

24.75 inches tall, 9.65 inches wide, on a 18-inch wheel. Written in inches, that is roughly 24.8×9.6R18.

How much does a 245/35R18 tire weigh?

Between 20.7 lb and 25.3 lb for the 9 tires listed here. The lightest is the General G-MAX RS (XL); the heaviest is the BFGoodrich g-Force Phenom T/A (XL).

What wheel width do I need for 245/35R18?

Manufacturers approve 8.0–9.5″ wide wheels for this size.

How many revolutions per mile does a 245/35R18 make?

Published figures run 832–840 revolutions per mile. The calculated figure is 814.8, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 245/35R18 than 285/30R18?

0.02 inches taller on paper (24.75″ vs 24.73″), which raises the axle about 0.01″. Your speedometer will read about 0.1% slow.