285/65R18 Tire Size Specifications & Compatible Vehicles
Overall Diameter
827.7 mm
Section Width
285 mm
Sidewall Height
185.3 mm
Circumference
2600.3 mm
Revs/Mile
619
Rim Diameter
18"
Inch Equivalent
32.6x11.2R18
Rim Width (ETRTO)
8.5" – 11.0"
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 285/65R18 and may be used as replacements:
Popular Comparisons
See how 285/65R18 compares to other common tire sizes:
Understanding 285/65R18
The tire size 285/65R18 means the tire has a section width of 285mm, an aspect ratio of 65% (the sidewall height is 65% of the width), and fits a 18-inch rim.
Sidewall Height = 285 x 0.65 = 185.3 mm
Overall Diameter = (185.3 x 2) + (18 x 25.4) = 827.7 mm
Circumference = 827.7 x π = 2600.3 mm
Overall Diameter = (185.3 x 2) + (18 x 25.4) = 827.7 mm
Circumference = 827.7 x π = 2600.3 mm
Frequently Asked Questions
The 285/65R18 is a standard tire size. Check your vehicle door jamb sticker or owner manual to confirm compatibility.
A 285/65R18 tire has an overall diameter of 827.7mm (32.6 inches). The sidewall height is 185.3mm, and the total circumference is 2600mm.
For 285/65R18 tires, the ETRTO recommended rim width is 9.5". The acceptable range is 8.5" minimum to 11.0" 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 285/65R18 827.7mm diameter. Compatible alternatives include 345/50R19, 265/70R18, 305/65R17. Use our Tire Size Calculator to compare any two sizes.