Everything we know about the 355/25 R21 tyre size: 1 owner reviews covering 1,000 miles of driving, and EU label data for the tyres you can actually buy in it.
EU label values are declared for each individual size, so the figures here are exact for 355/25 R21 rather than a range across a model. 7 tyres carry label data in this size. The most common load index is 107 (up to 975 kg per tyre). Speed ratings on offer: (Y) (301 km/h), Y (300 km/h), W (270 km/h). 1 tyres in this size carry the 3PMSF severe snow marking.
4 tyres in this size hold the top EU wet grip rating, class A. The highest scoring on Tyre Reviews:
The quietest 355/25 R21 tyres are labelled at 71 dB external noise:
Label values come from the EU EPREL database and apply to the EU market versions of each tyre. Wet grip and rolling resistance run from class A (best) to E; noise is the measured drive-by figure. A good label is a floor, not a verdict - the tests and owner ratings above tell you far more.
A 355/25 R21 tyre is 355 mm wide, its sidewall is 25% of that width (89 mm) tall, and it fits a 21 inch wheel. That gives an overall diameter of roughly 711 mm.
| Section width | 355 mm |
|---|---|
| Sidewall height | 89 mm |
| Rim diameter | 21" (533 mm) |
| Overall diameter | ≈ 711 mm |
| Circumference | ≈ 2,233 mm |
| Revolutions per km | ≈ 448 |
| Revolutions per mile | ≈ 721 |
355/25R21 355/25 ZR21 355-25-21 355 25 21
Figures are calculated from the nominal size. A loaded, rolling tyre runs a few percent smaller, and true widths vary slightly between makes.
The cars most often running this size in our owner reviews. Each links to the best rated tyres for that exact car.
The most recent owner reviews fitted in this size, in their own words.
Review your tyres and help the next driver choose. It takes about five minutes, and every review on this page came from a driver who took them.
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.
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.
Every test published as a Tyre Reviews test is run by Jonathan Benson, who has been testing tyres independently since 2007.