265/45R18 Tire Size Specifications & Compatible Vehicles
Overall Diameter
695.7 mm
Section Width
265 mm
Sidewall Height
119.3 mm
Circumference
2185.6 mm
Revs/Mile
736
Rim Diameter
18"
Inch Equivalent
27.4x10.4R18
Rim Width (ETRTO)
7.5" – 10.0"
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 265/45R18 and may be used as replacements:
Understanding 265/45R18
The tire size 265/45R18 means the tire has a section width of 265mm, an aspect ratio of 45% (the sidewall height is 45% of the width), and fits a 18-inch rim.
Sidewall Height = 265 x 0.45 = 119.3 mm
Overall Diameter = (119.3 x 2) + (18 x 25.4) = 695.7 mm
Circumference = 695.7 x π = 2185.6 mm
Overall Diameter = (119.3 x 2) + (18 x 25.4) = 695.7 mm
Circumference = 695.7 x π = 2185.6 mm
Frequently Asked Questions
The 265/45R18 is a standard tire size. Check your vehicle door jamb sticker or owner manual to confirm compatibility.
A 265/45R18 tire has an overall diameter of 695.7mm (27.4 inches). The sidewall height is 119.3mm, and the total circumference is 2186mm.
For 265/45R18 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 265/45R18 695.7mm diameter. Compatible alternatives include 165/80R17, 235/40R20, 155/85R17. Use our Tire Size Calculator to compare any two sizes.