275/40R21 Tire Size Specifications & Compatible Vehicles
Overall Diameter
753.4 mm
Section Width
275 mm
Sidewall Height
110.0 mm
Circumference
2366.9 mm
Revs/Mile
680
Rim Diameter
21"
Inch Equivalent
29.7x10.8R21
Rim Width (ETRTO)
8.5" – 11.0"
Compatible Vehicles
The following vehicles use 275/40R21 tires from the factory:
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 275/40R21 and may be used as replacements:
Popular Comparisons
See how 275/40R21 compares to other common tire sizes:
Understanding 275/40R21
The tire size 275/40R21 means the tire has a section width of 275mm, an aspect ratio of 40% (the sidewall height is 40% of the width), and fits a 21-inch rim.
Sidewall Height = 275 x 0.4 = 110.0 mm
Overall Diameter = (110.0 x 2) + (21 x 25.4) = 753.4 mm
Circumference = 753.4 x π = 2366.9 mm
Overall Diameter = (110.0 x 2) + (21 x 25.4) = 753.4 mm
Circumference = 753.4 x π = 2366.9 mm
Frequently Asked Questions
The 275/40R21 tire size is used on 2 vehicle trims including the 2025 Volvo XC90, 2024 Volvo XC90.
A 275/40R21 tire has an overall diameter of 753.4mm (29.7 inches). The sidewall height is 110.0mm, and the total circumference is 2367mm.
For 275/40R21 tires, the ETRTO recommended rim width is 9.5". The acceptable range is 8.5" minimum to 11.0" 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 275/40R21 753.4mm diameter. Compatible alternatives include 175/70R20, 245/50R20, 195/50R22. Use our Tire Size Calculator to compare any two sizes.