265/55R18 Tire Size Specifications & Compatible Vehicles
Overall Diameter
748.7 mm
Section Width
265 mm
Sidewall Height
145.8 mm
Circumference
2352.1 mm
Revs/Mile
684
Rim Diameter
18"
Inch Equivalent
29.5x10.4R18
Rim Width (ETRTO)
7.5" – 10.0"
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 265/55R18 and may be used as replacements:
Understanding 265/55R18
The tire size 265/55R18 means the tire has a section width of 265mm, an aspect ratio of 55% (the sidewall height is 55% of the width), and fits a 18-inch rim.
Sidewall Height = 265 x 0.55 = 145.8 mm
Overall Diameter = (145.8 x 2) + (18 x 25.4) = 748.7 mm
Circumference = 748.7 x π = 2352.1 mm
Overall Diameter = (145.8 x 2) + (18 x 25.4) = 748.7 mm
Circumference = 748.7 x π = 2352.1 mm
Frequently Asked Questions
The 265/55R18 is a standard tire size. Check your vehicle door jamb sticker or owner manual to confirm compatibility.
A 265/55R18 tire has an overall diameter of 748.7mm (29.5 inches). The sidewall height is 145.8mm, and the total circumference is 2352mm.
For 265/55R18 tires, the ETRTO recommended rim width is 9.0". The acceptable range is 7.5" minimum to 10.0" 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 265/55R18 748.7mm diameter. Compatible alternatives include 185/65R20, 285/60R16, 205/65R19. Use our Tire Size Calculator to compare any two sizes.