255/40R17 Tire Size Specifications & Compatible Vehicles
Overall Diameter
635.8 mm
Section Width
255 mm
Sidewall Height
102.0 mm
Circumference
1997.4 mm
Revs/Mile
806
Rim Diameter
17"
Inch Equivalent
25x10R17
Rim Width (ETRTO)
7.5" – 10.0"
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 255/40R17 and may be used as replacements:
Understanding 255/40R17
The tire size 255/40R17 means the tire has a section width of 255mm, an aspect ratio of 40% (the sidewall height is 40% of the width), and fits a 17-inch rim.
Sidewall Height = 255 x 0.4 = 102.0 mm
Overall Diameter = (102.0 x 2) + (17 x 25.4) = 635.8 mm
Circumference = 635.8 x π = 1997.4 mm
Overall Diameter = (102.0 x 2) + (17 x 25.4) = 635.8 mm
Circumference = 635.8 x π = 1997.4 mm
Frequently Asked Questions
The 255/40R17 is a standard tire size. Check your vehicle door jamb sticker or owner manual to confirm compatibility.
A 255/40R17 tire has an overall diameter of 635.8mm (25.0 inches). The sidewall height is 102.0mm, and the total circumference is 1997mm.
For 255/40R17 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 255/40R17 635.8mm diameter. Compatible alternatives include 255/45R16, 255/35R18, 255/50R15. Use our Tire Size Calculator to compare any two sizes.