255/65R18 Tire Size Specifications & Compatible Vehicles
Overall Diameter
788.7 mm
Section Width
255 mm
Sidewall Height
165.8 mm
Circumference
2477.8 mm
Revs/Mile
650
Rim Diameter
18"
Inch Equivalent
31.1x10R18
Rim Width (ETRTO)
7.5" – 10.0"
Compatible Vehicles
The following vehicles use 255/65R18 tires from the factory:
2025 Buick Enclave Preferred 2024 Buick Enclave Preferred 2023 Buick Enclave Preferred 2022 Buick Enclave Preferred 2021 Buick Enclave Preferred 2020 Buick Enclave Preferred 2025 Ford Explorer Base 2024 Ford Explorer Base/XLT 2023 Ford Explorer Base/XLT 2022 Ford Explorer Base/XLT 2021 Ford Explorer Base/XLT 2020 Ford Explorer Base/XLT
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 255/65R18 and may be used as replacements:
Popular Comparisons
See how 255/65R18 compares to other common tire sizes:
Understanding 255/65R18
The tire size 255/65R18 means the tire has a section width of 255mm, an aspect ratio of 65% (the sidewall height is 65% of the width), and fits a 18-inch rim.
Sidewall Height = 255 x 0.65 = 165.8 mm
Overall Diameter = (165.8 x 2) + (18 x 25.4) = 788.7 mm
Circumference = 788.7 x π = 2477.8 mm
Overall Diameter = (165.8 x 2) + (18 x 25.4) = 788.7 mm
Circumference = 788.7 x π = 2477.8 mm
Frequently Asked Questions
The 255/65R18 tire size is used on 12 vehicle trims including the 2025 Buick Enclave, 2024 Buick Enclave, 2023 Buick Enclave and 9 more.
A 255/65R18 tire has an overall diameter of 788.7mm (31.1 inches). The sidewall height is 165.8mm, and the total circumference is 2478mm.
For 255/65R18 tires, the ETRTO recommended rim width is 8.5". 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 255/65R18 788.7mm diameter. Compatible alternatives include 195/85R18, 255/70R17, 255/60R19. Use our Tire Size Calculator to compare any two sizes.