265/40R21 Tire Size Specifications
This tire size 265/40R21 fits 10 vehicles in our database.
Everything to know about the 265/40R21 tire size
Size geometry
A 265/40R21 tire has a 265mm section width and a 40% aspect ratio, mounted on a 21-inch rim. Sidewall height works out to 106.0mm (4.17") and overall outside diameter is 745.4mm (29.35"). At highway speed the tire completes about 427 revolutions per kilometre â your speedometer and odometer were calibrated against this number.
Direct substitute sizes
If 265/40R21 is unavailable, the closest same-diameter substitutes on the same rim are 255/42R21 and 275/39R21. Both keep your speedometer reading within 1% â safe for daily use, ABS, and stability control. Always verify load and speed ratings before swapping.
Plus / minus sizing options
For a 265/40R21 you can upsize to 275/34R22 (plus-one) to fit a larger wheel without changing the speedometer reading, or downsize to 255/47R20 (minus-one) for a softer ride or winter setup. Both stay inside the Âą3% diameter tolerance that ABS and TPMS systems expect.
Vehicle compatibility
10 vehicles in our database run the 265/40R21 tire size from the factory. Aftermarket fitment depends on rim width, offset, and clearance â match these specs to your wheel before purchasing tires.
Vehicles Using 265/40R21
Avatr Avatr 11
Years: 2022 - 2026
Avatr Avatr 12
Years: 2023 - 2026
Bentley Continental GT
Years: 2018 - 2026
Bentley Flying Spur
Years: 2019 - 2026
Ford Edge
Years: 2015 - 2023
Karma Automotive GS-6
Years: 2021 - 2026
Lincoln Nautilus
Years: 2019 - 2026
Mercedes-Benz EQE
Years: 2023 - 2026
Mercedes-Benz GLC
Years: 2023 - 2026
Porsche Macan
Years: 2015 - 2023