265/65R18 Tire Size Specifications & Compatible Vehicles
Overall Diameter
801.7 mm
Section Width
265 mm
Sidewall Height
172.3 mm
Circumference
2518.6 mm
Revs/Mile
639
Rim Diameter
18"
Inch Equivalent
31.6x10.4R18
Rim Width (ETRTO)
7.5" – 10.0"
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 265/65R18 and may be used as replacements:
Understanding 265/65R18
The tire size 265/65R18 means the tire has a section width of 265mm, an aspect ratio of 65% (the sidewall height is 65% of the width), and fits a 18-inch rim.
Sidewall Height = 265 x 0.65 = 172.3 mm
Overall Diameter = (172.3 x 2) + (18 x 25.4) = 801.7 mm
Circumference = 801.7 x π = 2518.6 mm
Overall Diameter = (172.3 x 2) + (18 x 25.4) = 801.7 mm
Circumference = 801.7 x π = 2518.6 mm
Frequently Asked Questions
The 265/65R18 is a standard tire size. Check your vehicle door jamb sticker or owner manual to confirm compatibility.
A 265/65R18 tire has an overall diameter of 801.7mm (31.6 inches). The sidewall height is 172.3mm, and the total circumference is 2519mm.
For 265/65R18 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 265/65R18 801.7mm diameter. Compatible alternatives include 245/60R20, 215/80R18, 345/50R18. Use our Tire Size Calculator to compare any two sizes.