tireheight.com

235/45R18 in inches

A 235/45R18 tire is 26.3″ tall and 9.3″ wide, and fits a 18″ wheel. In inches it is written 26.3×9.3R18.

Diameter26.33″
Width9.25″
Sidewall4.16″
235/45R18 drawn to scale: 26.33 inch diameter, 4.16 inch sidewall, 18 inch wheel, 9.25 inch tread width18″ wheel4.16″26.33″ overall9.25″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 235/45R18 tires really are

Heights published by BFGoodrich, General, Michelin and Toyo for all 29 tires in this size. Their published revolutions per mile work out to 25.5–25.9″ under load (below).

Real 235/45R18 tires measure 26.30–26.70″, against 26.33″ from the size code. They run both taller and shorter than the size code.

  1. Michelin Pilot Sport All-Season 426.70″ +0.37″
  2. BFGoodrich Advantage Control26.34″ +0.01″
  3. BFGoodrich g-Force COMP-2 A/S PLUS26.34″ +0.01″
  4. BFGoodrich g-Force Phenom T/A26.34″ +0.01″
  5. Michelin Defender226.34″ +0.01″
  6. Michelin Pilot Alpin 526.34″ +0.01″
  7. Michelin X-Ice Snow26.34″ +0.01″
  8. Michelin X-Ice Snow+26.34″ +0.01″
  9. Toyo Celsius II26.34″ +0.01″
  10. Toyo Celsius Sport26.34″ +0.01″
  11. Toyo Extensa A/S II26.34″ +0.01″
  12. Toyo Extensa HP II26.34″ +0.01″
  13. Toyo Observe G3-Ice26.34″ +0.01″
  14. Toyo Proxes Sport A/S26.34″ +0.01″
  15. General AltiMAX Arctic X26.30″ −0.03″
  16. General AltiMAX RT4526.30″ −0.03″
  17. General AltiMAX365 AW26.30″ −0.03″
  18. General G-MAX AS0726.30″ −0.03″
  19. Michelin CrossClimate226.30″ −0.03″
  20. Michelin Energy Saver All-Season · 226.30″ −0.03″
  21. Michelin Pilot Sport 426.30″ −0.03″
  22. Michelin Pilot Sport 4 S26.30″ −0.03″
  23. Michelin Primacy All Season26.30″ −0.03″
  24. Michelin Primacy MXM426.30″ −0.03″
  25. Michelin Primacy Tour A/S · 226.30″ −0.03″
  26. Toyo Proxes G-Tour26.30″ −0.03″
  27. Toyo Proxes Sport 226.30″ −0.03″
Each bar runs from the size code's 26.33″ (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 load25.5–25.9″

Published revs per mile (780–790) mean the tire rolls like a 25.5–25.9″ tire on the vehicle. Use this for speedometer calibration.

Weight spread23.4–29.8 lb

The lightest (General AltiMAX RT45, XL) is 6.4 lb lighter per corner than the heaviest (Toyo Proxes Sport A/S, XL).

29 tires in 235/45R18

Sort by the spec you care about.

LoadRevs/miSource
General AltiMAX RT45TouringXL · 98V26.3023.411.01,653789Spec page
General AltiMAX365 AWTouringXL · 98V26.3023.411.01,653789Spec page
Michelin Pilot Sport 4 SPerformanceXL · 98(Y)26.3023.59.51,653790Spec page
Michelin Pilot Alpin 5WinterXL · 98V26.3423.69.51,653790Spec page
Toyo Proxes Sport 2PerformanceXL · 98(Y)26.3023.79.21,653789Spec page
Michelin Energy Saver All-SeasonAll-seasonSL · 94V26.3023.98.51,477790Spec page
Michelin X-Ice Snow+WinterXL · 98H26.3424.010.51,653790Spec page
Michelin Primacy Tour A/STouringSL · 94V26.3024.18.51,477790Spec page
Michelin X-Ice SnowWinterXL · 98H26.3424.210.51,653790Spec page
Michelin Pilot Sport 4PerformanceXL · 98Y26.3024.39.01,653790Spec page
Toyo Extensa A/S IIAll-seasonSL · 94V26.3424.410.71,477789Spec page
Michelin Primacy All SeasonTouringXL · 98W26.3024.48.01,653790Spec page
Michelin Primacy Tour A/STouringXL · 98V26.3024.48.01,653790Spec page
General G-MAX AS07PerformanceXL · 98W26.3024.510.01,653789Spec page
BFGoodrich Advantage ControlAll-seasonXL · 98V26.3424.610.51,653790Spec page
Toyo Extensa HP IIPerformanceSL · 94W26.3424.79.41,477789Spec page
Toyo Proxes G-TourXL · 98W26.3024.911.01,653789Spec page
Toyo Celsius IITouringXL · 98V26.3425.411.21,653789Spec page
Michelin Primacy MXM4TouringXL · 98W26.3025.48.01,653790Spec page
Toyo Celsius SportPerformanceXL · 98W26.3425.59.81,653789Spec page
Michelin Energy Saver All-SeasonAll-seasonSL · 94V26.3025.68.51,477790Spec page
General AltiMAX Arctic XWinterXL · 98T26.3025.812.01,653789Spec page
Michelin CrossClimate2All-seasonXL · 98V26.3025.810.01,653790Spec page
Michelin Pilot Sport All-Season 4PerformanceXL · 98Y26.7025.910.01,653780Spec page
Michelin Defender2All-seasonXL · 98V26.3426.210.51,653790Spec page
Toyo Observe G3-IceWinterXL · 98T26.3426.711.31,653789Spec page
BFGoodrich g-Force Phenom T/APerformanceXL · 98W26.3426.98.51,653790Spec page
BFGoodrich g-Force COMP-2 A/S PLUSPerformanceXL · 98W26.3427.19.01,653790Spec page
Toyo Proxes Sport A/SPerformanceXL · 98W26.3429.89.81,653789Spec page

Is 235/45R18 a 26-inch tire?

≈26″

Yes. The size code works out to 26.33″, and the 29 tires here publish 26.30–26.70″, so people call it a 26.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 235/45R18Difference
335/30R1825.91-0.41″-1.6%
225/45R1825.97-0.35″-1.3%
255/40R1826.03-0.30″-1.1%
295/35R1826.13-0.20″-0.7%
265/40R1826.35+0.02″+0.1%
305/35R1826.41+0.08″+0.3%
215/50R1826.46+0.14″+0.5%
275/40R1826.66+0.33″+1.3%
245/45R1826.68+0.35″+1.3%
315/35R1826.68+0.35″+1.3%

How to read 235/45R18

How to read any tire size

235/45R18 98V as printed on the tire sidewall, with each part numbered235/45R18 98V123456
How 235/45R18 98V is printed on the sidewall. It's the most common code among the 29 tires here (8 of them); tires in this size come in other load and speed ratings too.
1235Section width

235 mm across the widest point, or 9.25 inches. Every 235 size

245Aspect ratio

A percentage, not a measurement: the sidewall is 45% as tall as the tire is wide, which is 105.8 mm or 4.16 inches.

3RConstruction

Radial construction.

418Wheel diameter

Mounts on a 18-inch wheel. Approved wheel widths run 7.5″ to 9.0″.

598Load index

Each tire carries up to 1,653 lb (750 kg) at its maximum pressure.

6VSpeed rating

Rated for up to 149 mph sustained.

XLExtra load

Printed after the size. In this size the XL tires carry up to 1,653 lb each and the standard-load tires up to 1,477 lb, as published.

SpecificationInchesMetric
Overall diameter26.33669 mm
Section width9.25235 mm
Sidewall height4.16105.8 mm
Circumference82.72,101 mm
Revolutions per mile (calculated, unloaded)766.1476 per km
Revolutions per mile (published by manufacturers)780–790485–491 per km
Approved wheel width7.5–9.0191–229 mm

Speedometer error after switching to 235/45R18

Your actual speed– mph

Questions about 235/45R18

What is 235/45R18 in inches?

26.33 inches tall, 9.25 inches wide, on a 18-inch wheel. Written in inches, that is roughly 26.3×9.3R18.

How much does a 235/45R18 tire weigh?

Between 23.4 lb and 29.8 lb for the 29 tires listed here. The lightest is the General AltiMAX RT45 (XL); the heaviest is the Toyo Proxes Sport A/S (XL).

What wheel width do I need for 235/45R18?

Manufacturers approve 7.5–9.0″ wide wheels for this size.

How many revolutions per mile does a 235/45R18 make?

Published figures run 780–790 revolutions per mile. The calculated figure is 766.1, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 235/45R18 than 295/35R18?

0.20 inches taller on paper (26.33″ vs 26.13″), which raises the axle about 0.10″. Your speedometer will read about 0.8% slow.