255/70R18 Tire Size Specifications & Compatible Vehicles
Overall Diameter
814.2 mm
Section Width
255 mm
Sidewall Height
178.5 mm
Circumference
2557.9 mm
Revs/Mile
629
Rim Diameter
18"
Inch Equivalent
32.1x10R18
Rim Width (ETRTO)
7.5" – 10.0"
Compatible Vehicles
The following vehicles use 255/70R18 tires from the factory:
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 255/70R18 and may be used as replacements:
Popular Comparisons
See how 255/70R18 compares to other common tire sizes:
Understanding 255/70R18
The tire size 255/70R18 means the tire has a section width of 255mm, an aspect ratio of 70% (the sidewall height is 70% of the width), and fits a 18-inch rim.
Sidewall Height = 255 x 0.7 = 178.5 mm
Overall Diameter = (178.5 x 2) + (18 x 25.4) = 814.2 mm
Circumference = 814.2 x π = 2557.9 mm
Overall Diameter = (178.5 x 2) + (18 x 25.4) = 814.2 mm
Circumference = 814.2 x π = 2557.9 mm
Frequently Asked Questions
The 255/70R18 tire size is used on 6 vehicle trims including the 2025 Jeep Wrangler, 2024 Jeep Wrangler, 2023 Jeep Wrangler and 3 more.
A 255/70R18 tire has an overall diameter of 814.2mm (32.1 inches). The sidewall height is 178.5mm, and the total circumference is 2558mm.
For 255/70R18 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 255/70R18 814.2mm diameter. Compatible alternatives include 225/85R17, 255/75R17, 195/85R19. Use our Tire Size Calculator to compare any two sizes.