325/40R22 Tire Size Specifications & Compatible Vehicles
Overall Diameter
818.8 mm
Section Width
325 mm
Sidewall Height
130.0 mm
Circumference
2572.3 mm
Revs/Mile
626
Rim Diameter
22"
Inch Equivalent
32.2x12.8R22
Rim Width (ETRTO)
10.5" – 13.0"
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 325/40R22 and may be used as replacements:
Understanding 325/40R22
The tire size 325/40R22 means the tire has a section width of 325mm, an aspect ratio of 40% (the sidewall height is 40% of the width), and fits a 22-inch rim.
Sidewall Height = 325 x 0.4 = 130.0 mm
Overall Diameter = (130.0 x 2) + (22 x 25.4) = 818.8 mm
Circumference = 818.8 x π = 2572.3 mm
Overall Diameter = (130.0 x 2) + (22 x 25.4) = 818.8 mm
Circumference = 818.8 x π = 2572.3 mm
Frequently Asked Questions
The 325/40R22 is a standard tire size. Check your vehicle door jamb sticker or owner manual to confirm compatibility.
A 325/40R22 tire has an overall diameter of 818.8mm (32.2 inches). The sidewall height is 130.0mm, and the total circumference is 2572mm.
For 325/40R22 tires, the ETRTO recommended rim width is 11.5". The acceptable range is 10.5" minimum to 13.0" 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 325/40R22 818.8mm diameter. Compatible alternatives include 345/45R20, 285/50R21, 185/70R22. Use our Tire Size Calculator to compare any two sizes.