tireheight.com

235/50R18 in inches

A 235/50R18 tire is 27.3″ tall and 9.3″ wide, and fits a 18″ wheel. In inches it is written 27.3×9.3R18.

Diameter27.25″
Width9.25″
Sidewall4.63″
235/50R18 drawn to scale: 27.25 inch diameter, 4.63 inch sidewall, 18 inch wheel, 9.25 inch tread width18″ wheel4.63″27.25″ overall9.25″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 235/50R18 tires really are

Heights published by BFGoodrich, General, Michelin and Toyo for all 26 tires in this size. Their published revolutions per mile work out to 26.5–26.6″ under load (below).

Real 235/50R18 tires measure 27.28–27.40″, against 27.25″ from the size code. Every one runs taller than the size code.

  1. Michelin Pilot Sport All-Season 427.40″ +0.15″
  2. General AltiMAX Arctic X27.30″ +0.05″
  3. General AltiMAX RT45 · 227.30″ +0.05″
  4. General AltiMAX365 AW27.30″ +0.05″
  5. General G-MAX AS0727.30″ +0.05″
  6. General G-MAX Justice27.30″ +0.05″
  7. General G-MAX RS27.30″ +0.05″
  8. Michelin CrossClimate227.30″ +0.05″
  9. Michelin Pilot Sport 4 S27.30″ +0.05″
  10. Michelin Pilot Sport 4 SUV27.30″ +0.05″
  11. Michelin Pilot Sport 527.30″ +0.05″
  12. Michelin Primacy Tour A/S27.30″ +0.05″
  13. Toyo Proxes G-Tour27.30″ +0.05″
  14. Toyo Celsius II27.28″ +0.03″
  15. Toyo Celsius Sport27.28″ +0.03″
  16. Toyo Extensa A/S II27.28″ +0.03″
  17. Toyo Extensa HP II27.28″ +0.03″
  18. Toyo Observe G3-Ice27.28″ +0.03″
  19. BFGoodrich Advantage Control27.28″ +0.03″
  20. BFGoodrich Elite-Force T/A27.28″ +0.03″
  21. BFGoodrich g-Force COMP-2 A/S PLUS27.28″ +0.03″
  22. BFGoodrich g-Force Phenom T/A27.28″ +0.03″
  23. Michelin Defender227.28″ +0.03″
  24. Michelin X-Ice Snow27.28″ +0.03″
  25. Michelin X-Ice Snow+27.28″ +0.03″
Each bar runs from the size code's 27.25″ (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 load26.5–26.6″

Published revs per mile (758–762) mean the tire rolls like a 26.5–26.6″ tire on the vehicle. Use this for speedometer calibration.

Weight spread23.9–32.3 lb

The lightest (General AltiMAX RT45, SL) is 8.4 lb lighter per corner than the heaviest (Michelin Pilot Sport 4 SUV, SL).

26 tires in 235/50R18

Sort by the spec you care about.

LoadRevs/miSource
General AltiMAX RT45TouringSL · 97H27.3023.911.01,609762Spec page
General AltiMAX RT45TouringSL · 97V27.3023.911.01,609762Spec page
General AltiMAX365 AWTouringSL · 97V27.3023.911.01,609762Spec page
Toyo Extensa HP IIPerformanceXL · 101W27.2824.39.41,819761Spec page
General G-MAX RSPerformanceSL · 97Y27.3024.710.01,609762Spec page
Michelin Pilot Sport 4 SPerformanceXL · 101(Y)27.3024.99.51,819762Spec page
Michelin Pilot Sport 5PerformanceXL · 101(Y)27.3025.09.01,819762Spec page
General G-MAX JusticePerformanceXL · 101W27.3025.610.01,819762Spec page
General G-MAX AS07PerformanceSL · 97W27.3025.910.01,609762Spec page
Michelin Defender2All-seasonXL · 101V27.2826.610.51,819762Spec page
Michelin X-Ice SnowWinterXL · 101H27.2826.910.51,819762Spec page
Michelin CrossClimate2All-seasonSL · 97V27.3027.010.01,609762Spec page
Michelin X-Ice Snow+WinterXL · 101H27.2827.010.51,819762Spec page
Toyo Extensa A/S IIAll-seasonSL · 97V27.2827.010.71,609761Spec page
BFGoodrich Advantage ControlAll-seasonSL · 97V27.2827.310.51,609762Spec page
Michelin Primacy Tour A/STouringSL · 97V27.3027.49.01,609762Spec page
Michelin Pilot Sport All-Season 4PerformanceXL · 101Y27.4027.510.01,819758Spec page
Toyo Celsius SportPerformanceXL · 101W27.2828.29.91,819761Spec page
General AltiMAX Arctic XWinterXL · 101T27.3028.412.01,819762Spec page
BFGoodrich g-Force Phenom T/APerformanceXL · 101W27.2828.68.01,819762Spec page
Toyo Celsius IITouringXL · 101V27.2829.311.21,819761Spec page
Toyo Proxes G-TourSL · 97V27.3029.311.71,609761Spec page
Toyo Observe G3-IceWinterXL · 101T27.2829.812.01,819761Spec page
BFGoodrich g-Force COMP-2 A/S PLUSPerformanceXL · 101W27.2829.89.01,609762Spec page
BFGoodrich Elite-Force T/AAll-seasonXL · 101W27.2830.810.01,819762Spec page
Michelin Pilot Sport 4 SUVPerformanceSL · 97V27.3032.39.51,609762Spec page

Is 235/50R18 a 27-inch tire?

≈27″

Yes. The size code works out to 27.25″, and the 26 tires here publish 27.28–27.40″, so people call it a 27.

All 27-inch tire sizes, on every wheel size.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 235/50R18Difference
245/45R1826.68-0.57″-2.1%
315/35R1826.68-0.57″-2.1%
225/50R1826.86-0.39″-1.4%
285/40R1826.98-0.28″-1.0%
255/45R1827.04-0.22″-0.8%
215/55R1827.31+0.06″+0.2%
265/45R1827.39+0.14″+0.5%
345/35R1827.51+0.26″+0.9%
245/50R1827.65+0.39″+1.4%
225/55R1827.74+0.49″+1.8%

How to read 235/50R18

How to read any tire size

235/50R18 97V as printed on the tire sidewall, with each part numbered235/50R18 97V123456
How 235/50R18 97V is printed on the sidewall. It's the most common code among the 26 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

250Aspect ratio

A percentage, not a measurement: the sidewall is 50% as tall as the tire is wide, which is 117.5 mm or 4.63 inches.

3RConstruction

Radial construction.

418Wheel diameter

Mounts on a 18-inch wheel. Approved wheel widths run 6.5″ to 8.5″.

597Load index

Each tire carries up to 1,609 lb (730 kg) at its maximum pressure.

6VSpeed rating

Rated for up to 149 mph sustained.

SpecificationInchesMetric
Overall diameter27.25692 mm
Section width9.25235 mm
Sidewall height4.63117.5 mm
Circumference85.62,175 mm
Revolutions per mile (calculated, unloaded)740.1460 per km
Revolutions per mile (published by manufacturers)758–762471–473 per km
Approved wheel width6.5–8.5165–216 mm

Speedometer error after switching to 235/50R18

Your actual speed– mph

Questions about 235/50R18

What is 235/50R18 in inches?

27.25 inches tall, 9.25 inches wide, on a 18-inch wheel. Written in inches, that is roughly 27.3×9.3R18.

How much does a 235/50R18 tire weigh?

Between 23.9 lb and 32.3 lb for the 26 tires listed here. The lightest is the General AltiMAX RT45 (SL); the heaviest is the Michelin Pilot Sport 4 SUV (SL).

What wheel width do I need for 235/50R18?

Manufacturers approve 6.5–8.5″ wide wheels for this size.

How many revolutions per mile does a 235/50R18 make?

Published figures run 758–762 revolutions per mile. The calculated figure is 740.1, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 235/50R18 than 255/45R18?

0.22 inches taller on paper (27.25″ vs 27.04″), which raises the axle about 0.11″. Your speedometer will read about 0.8% slow.