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280/40 R21 Tires

Everything we know about the 280/40 R21 tire size: 1 owner reviews covering 7,500 miles of driving, and EU label data for the tires you can actually buy in it.

  • 1owner reviews
  • 7,500 milescovered on them
280/40 R21 To scale, mm
Ø 757 280 112 21" 112

What does 280/40 R21 mean?

A 280/40 R21 tire is 280 mm wide, its sidewall is 40% of that width (112 mm) tall, and it fits a 21 inch wheel. That gives an overall diameter of roughly 757 mm.

280/40 R21 nominal dimensions
Section width280 mm
Sidewall height112 mm
Rim diameter21" (533 mm)
Overall diameter≈ 757 mm
Circumference≈ 2,379 mm
Revolutions per km≈ 420
Revolutions per mile≈ 676

Also written as

280/40R21 280/40 ZR21 280-40-21 280 40 21

Figures are calculated from the nominal size. A loaded, rolling tire runs a few percent smaller, and true widths vary slightly between makes.

Comparing two sizes? Use the tire size calculator →

What cars use 280/40 R21 tires?

The cars most often running this size in our owner reviews. Each links to the best rated tires for that exact car.

What drivers say about their 280/40 R21 tires

The most recent owner reviews fitted in this size, in their own words.

61%
Yokohama iceGUARD G075 280/40 R21 Audi Q7 7,500 miles November 2, 2026

There is quite low normal tire hissing but it has as well extra humming noise on speed 45-60km/h You need to count with. Maybe because of the extra deep pattern for winter tire.

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Where this data comes from

Owner ratings are submitted through the review form on this site, naming the tire, the size and the distance covered, and are checked by hand before publication. Test results come from independent published tire tests indexed by size, and label values from the EU EPREL database.

About the TR Score

The Tire Reviews Score rates each tire out of 10 using independent test results and the full body of owner reviews, so you can check a car-specific ranking against the wider evidence.

Who does the testing

Every test published as a Tire Reviews test is run by Jonathan Benson, who has been testing tires independently since 2007.

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