305/40R22 Tire Size Specifications & Compatible Vehicles
Overall Diameter
802.8 mm
Section Width
305 mm
Sidewall Height
122.0 mm
Circumference
2522.1 mm
Revs/Mile
638
Rim Diameter
22"
Inch Equivalent
31.6x12R22
Rim Width (ETRTO)
9.5" – 12.0"
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 305/40R22 and may be used as replacements:
Popular Comparisons
See how 305/40R22 compares to other common tire sizes:
Understanding 305/40R22
The tire size 305/40R22 means the tire has a section width of 305mm, an aspect ratio of 40% (the sidewall height is 40% of the width), and fits a 22-inch rim.
Sidewall Height = 305 x 0.4 = 122.0 mm
Overall Diameter = (122.0 x 2) + (22 x 25.4) = 802.8 mm
Circumference = 802.8 x π = 2522.1 mm
Overall Diameter = (122.0 x 2) + (22 x 25.4) = 802.8 mm
Circumference = 802.8 x π = 2522.1 mm
Frequently Asked Questions
The 305/40R22 is a standard tire size. Check your vehicle door jamb sticker or owner manual to confirm compatibility.
A 305/40R22 tire has an overall diameter of 802.8mm (31.6 inches). The sidewall height is 122.0mm, and the total circumference is 2522mm.
For 305/40R22 tires, the ETRTO recommended rim width is 10.5". The acceptable range is 9.5" minimum to 12.0" 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 305/40R22 802.8mm diameter. Compatible alternatives include 245/55R21, 295/50R20, 225/60R21. Use our Tire Size Calculator to compare any two sizes.