265/45R21 Tire Size Specifications & Compatible Vehicles
Overall Diameter
771.9 mm
Section Width
265 mm
Sidewall Height
119.3 mm
Circumference
2425.0 mm
Revs/Mile
664
Rim Diameter
21"
Inch Equivalent
30.4x10.4R21
Rim Width (ETRTO)
7.5" – 10.0"
Compatible Vehicles
The following vehicles use 265/45R21 tires from the factory:
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 265/45R21 and may be used as replacements:
Understanding 265/45R21
The tire size 265/45R21 means the tire has a section width of 265mm, an aspect ratio of 45% (the sidewall height is 45% of the width), and fits a 21-inch rim.
Sidewall Height = 265 x 0.45 = 119.3 mm
Overall Diameter = (119.3 x 2) + (21 x 25.4) = 771.9 mm
Circumference = 771.9 x π = 2425.0 mm
Overall Diameter = (119.3 x 2) + (21 x 25.4) = 771.9 mm
Circumference = 771.9 x π = 2425.0 mm
Frequently Asked Questions
The 265/45R21 tire size is used on 4 vehicle trims including the 2025 Jeep Grand Cherokee, 2024 Jeep Grand Cherokee, 2023 Jeep Grand Cherokee and 1 more.
A 265/45R21 tire has an overall diameter of 771.9mm (30.4 inches). The sidewall height is 119.3mm, and the total circumference is 2425mm.
For 265/45R21 tires, the ETRTO recommended rim width is 9.0". 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 265/45R21 771.9mm diameter. Compatible alternatives include 165/80R20, 155/85R20, 305/35R22. Use our Tire Size Calculator to compare any two sizes.