235/55R18 Tire Size Specifications & Compatible Vehicles
Overall Diameter
715.7 mm
Section Width
235 mm
Sidewall Height
129.3 mm
Circumference
2248.4 mm
Revs/Mile
716
Rim Diameter
18"
Inch Equivalent
28.2x9.3R18
Rim Width (ETRTO)
7.0" – 9.0"
Compatible Vehicles
The following vehicles use 235/55R18 tires from the factory:
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 235/55R18 and may be used as replacements:
Popular Comparisons
See how 235/55R18 compares to other common tire sizes:
Understanding 235/55R18
The tire size 235/55R18 means the tire has a section width of 235mm, an aspect ratio of 55% (the sidewall height is 55% of the width), and fits a 18-inch rim.
Sidewall Height = 235 x 0.55 = 129.3 mm
Overall Diameter = (129.3 x 2) + (18 x 25.4) = 715.7 mm
Circumference = 715.7 x π = 2248.4 mm
Overall Diameter = (129.3 x 2) + (18 x 25.4) = 715.7 mm
Circumference = 715.7 x π = 2248.4 mm
Frequently Asked Questions
The 235/55R18 tire size is used on 10 vehicle trims including the 2025 Buick Envision, 2023 Chrysler 300, 2023 Chrysler 300 and 7 more.
A 235/55R18 tire has an overall diameter of 715.7mm (28.2 inches). The sidewall height is 129.3mm, and the total circumference is 2248mm.
For 235/55R18 tires, the ETRTO recommended rim width is 8.0". The acceptable range is 7.0" minimum to 9.0" maximum. Using a rim outside this range can cause improper bead seating and unsafe handling.
Yes, as long as the replacement tire overall diameter is within 3% of the 235/55R18 715.7mm diameter. Compatible alternatives include 315/45R17, 185/70R18, 215/60R18. Use our Tire Size Calculator to compare any two sizes.