265/40R18 Tire Size Specifications & Compatible Vehicles
Overall Diameter
669.2 mm
Section Width
265 mm
Sidewall Height
106.0 mm
Circumference
2102.4 mm
Revs/Mile
765
Rim Diameter
18"
Inch Equivalent
26.3x10.4R18
Rim Width (ETRTO)
7.5" – 10.0"
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 265/40R18 and may be used as replacements:
Understanding 265/40R18
The tire size 265/40R18 means the tire has a section width of 265mm, an aspect ratio of 40% (the sidewall height is 40% of the width), and fits a 18-inch rim.
Sidewall Height = 265 x 0.4 = 106.0 mm
Overall Diameter = (106.0 x 2) + (18 x 25.4) = 669.2 mm
Circumference = 669.2 x π = 2102.4 mm
Overall Diameter = (106.0 x 2) + (18 x 25.4) = 669.2 mm
Circumference = 669.2 x π = 2102.4 mm
Frequently Asked Questions
The 265/40R18 is a standard tire size. Check your vehicle door jamb sticker or owner manual to confirm compatibility.
A 265/40R18 tire has an overall diameter of 669.2mm (26.3 inches). The sidewall height is 106.0mm, and the total circumference is 2102mm.
For 265/40R18 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 265/40R18 669.2mm diameter. Compatible alternatives include 175/75R16, 235/45R18, 155/60R19. Use our Tire Size Calculator to compare any two sizes.