265/30R21 Tire Size Specifications & Compatible Vehicles
Overall Diameter
692.4 mm
Section Width
265 mm
Sidewall Height
79.5 mm
Circumference
2175.2 mm
Revs/Mile
740
Rim Diameter
21"
Inch Equivalent
27.3x10.4R21
Rim Width (ETRTO)
7.5" – 10.0"
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 265/30R21 and may be used as replacements:
Understanding 265/30R21
The tire size 265/30R21 means the tire has a section width of 265mm, an aspect ratio of 30% (the sidewall height is 30% of the width), and fits a 21-inch rim.
Sidewall Height = 265 x 0.3 = 79.5 mm
Overall Diameter = (79.5 x 2) + (21 x 25.4) = 692.4 mm
Circumference = 692.4 x π = 2175.2 mm
Overall Diameter = (79.5 x 2) + (21 x 25.4) = 692.4 mm
Circumference = 692.4 x π = 2175.2 mm
Frequently Asked Questions
The 265/30R21 is a standard tire size. Check your vehicle door jamb sticker or owner manual to confirm compatibility.
A 265/30R21 tire has an overall diameter of 692.4mm (27.3 inches). The sidewall height is 79.5mm, and the total circumference is 2175mm.
For 265/30R21 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 265/30R21 692.4mm diameter. Compatible alternatives include 205/45R20, 175/60R19, 185/50R20. Use our Tire Size Calculator to compare any two sizes.