255/35R18 Tire Size Specifications & Compatible Vehicles
Overall Diameter
635.7 mm
Section Width
255 mm
Sidewall Height
89.3 mm
Circumference
1997.1 mm
Revs/Mile
806
Rim Diameter
18"
Inch Equivalent
25x10R18
Rim Width (ETRTO)
7.5" – 10.0"
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 255/35R18 and may be used as replacements:
Popular Comparisons
See how 255/35R18 compares to other common tire sizes:
Understanding 255/35R18
The tire size 255/35R18 means the tire has a section width of 255mm, an aspect ratio of 35% (the sidewall height is 35% of the width), and fits a 18-inch rim.
Sidewall Height = 255 x 0.35 = 89.3 mm
Overall Diameter = (89.3 x 2) + (18 x 25.4) = 635.7 mm
Circumference = 635.7 x π = 1997.1 mm
Overall Diameter = (89.3 x 2) + (18 x 25.4) = 635.7 mm
Circumference = 635.7 x π = 1997.1 mm
Frequently Asked Questions
The 255/35R18 is a standard tire size. Check your vehicle door jamb sticker or owner manual to confirm compatibility.
A 255/35R18 tire has an overall diameter of 635.7mm (25.0 inches). The sidewall height is 89.3mm, and the total circumference is 1997mm.
For 255/35R18 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 255/35R18 635.7mm diameter. Compatible alternatives include 255/40R17, 255/30R19, 255/45R16. Use our Tire Size Calculator to compare any two sizes.