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245/55 R21 Tyres

Everything we know about the 245/55 R21 tyre size: 1 owner reviews covering 3,700 miles of driving, and EU label data for the tyres you can actually buy in it.

  • 1owner reviews
  • 3,700 milescovered on them
245/55 R21 To scale, mm
Ø 803 245 135 21" 135

What does 245/55 R21 mean?

A 245/55 R21 tyre is 245 mm wide, its sidewall is 55% of that width (135 mm) tall, and it fits a 21 inch wheel. That gives an overall diameter of roughly 803 mm.

245/55 R21 nominal dimensions
Section width245 mm
Sidewall height135 mm
Rim diameter21" (533 mm)
Overall diameter≈ 803 mm
Circumference≈ 2,522 mm
Revolutions per km≈ 396
Revolutions per mile≈ 638

Also written as

245/55R21 245/55 ZR21 245-55-21 245 55 21

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

Comparing two sizes? Use the tyre size calculator →

What cars use 245/55 R21 tyres?

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

What drivers say about their 245/55 R21 tyres

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

53%
Hankook Ventus V12 evo2 245/55 R21 BMW 740i 3,700 miles March 17, 2025
I purchased these tires in South Carolina in late October and after only driving 3700 miles the tires indicate a tread level of a 5 this is just horrible, I called Hankook and they explained to me that they are a summer tire with NO mileage warranty and they are a warm weather tire, I advised I am in Myrtle Beach, SC if this is not warm enough for the tires to last at least 35,000 to 40,000 miles then why do they allow shops to sell them in this area but to have over half the tread life gone in only 4 months and under 4,000 miles is just NOT acceptable and in case anyone is wondering what kind of a car they are on its a 2019 BMW 740i Individual that my wife drives so its treated like a baby. Would never buy a Hankook again.

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Where this data comes from

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

About the TR Score

The Tyre Reviews Score rates each tyre 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 Tyre Reviews test is run by Jonathan Benson, who has been testing tyres independently since 2007.

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