255/70R17 Tire Size Specifications & Compatible Vehicles
Overall Diameter
788.8 mm
Section Width
255 mm
Sidewall Height
178.5 mm
Circumference
2478.1 mm
Revs/Mile
649
Rim Diameter
17"
Inch Equivalent
31.1x10R17
Rim Width (ETRTO)
7.5" – 10.0"
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 255/70R17 and may be used as replacements:
Understanding 255/70R17
The tire size 255/70R17 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 17-inch rim.
Sidewall Height = 255 x 0.7 = 178.5 mm
Overall Diameter = (178.5 x 2) + (17 x 25.4) = 788.8 mm
Circumference = 788.8 x π = 2478.1 mm
Overall Diameter = (178.5 x 2) + (17 x 25.4) = 788.8 mm
Circumference = 788.8 x π = 2478.1 mm
Frequently Asked Questions
The 255/70R17 is a standard tire size. Check your vehicle door jamb sticker or owner manual to confirm compatibility.
A 255/70R17 tire has an overall diameter of 788.8mm (31.1 inches). The sidewall height is 178.5mm, and the total circumference is 2478mm.
For 255/70R17 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 255/70R17 788.8mm diameter. Compatible alternatives include 225/85R16, 255/75R16, 195/85R18. Use our Tire Size Calculator to compare any two sizes.