I've been using these tyres in the UK for a month now on my BMW X5 40D xDrive (with 315/35 R21 rears) and they are truly excellent. Have no experience on snow/ice yet, but on my cold, wet rural roads they are superlative - sure-footed, very economical and quiet. Highly recommended
285/40 R21 Tyres
Everything we know about the 285/40 R21 tyre size: 5 owner reviews covering 53,200 miles of driving, and EU label data for the tyres you can actually buy in it.
- 5owner reviews
- 53,200 milescovered on them
- 126tyres made in this size
285/40 R21 EU tyre label data
EU label values are declared for each individual size, so the figures here are exact for 285/40 R21 rather than a range across a model. 102 tyres carry label data in this size. The most common load index is 109 (up to 1,030 kg per tyre). Speed ratings on offer: (Y) (301 km/h), Y (300 km/h), W (270 km/h), V (240 km/h), H (210 km/h), T (190 km/h), Q (160 km/h). 40 tyres in this size carry the 3PMSF severe snow marking.
A Best wet grip
46 tyres in this size hold the top EU wet grip rating, class A. The highest scoring on Tyre Reviews:
- Pirelli P Zero Winter 2 Winter 9.8
- Goodyear Eagle F1 Asymmetric 6 Summer 9.7
- Goodyear Vector All Season 4 All Season 9.7
- Michelin CrossClimate 3 Sport All Season 9.6
- Bridgestone Potenza Sport Evo Summer 9.5
- Continental PremiumContact 7 Summer 9.5
A Lowest rolling resistance
The most fuel efficient choice: 3 tyres in this size reach rolling resistance class A. The highest scoring on Tyre Reviews:
- Pirelli P Zero Summer 8.8
- Hankook iON evo SUV Summer 8.5
- Bridgestone Turanza 6 Summer 8.4
68dB Quietest tyres
The quietest 285/40 R21 tyres are labelled at 68 dB external noise:
- Pirelli P Zero Summer 8.8
- Hankook iON evo SUV Summer 8.5
- Accelera Iota ST68 Summer 6.6
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.
What does 285/40 R21 mean?
A 285/40 R21 tyre is 285 mm wide, its sidewall is 40% of that width (114 mm) tall, and it fits a 21 inch wheel. That gives an overall diameter of roughly 761 mm.
| Section width | 285 mm |
|---|---|
| Sidewall height | 114 mm |
| Rim diameter | 21" (533 mm) |
| Overall diameter | ≈ 761 mm |
| Circumference | ≈ 2,392 mm |
| Revolutions per km | ≈ 418 |
| Revolutions per mile | ≈ 673 |
Also written as
285/40R21 285/40 ZR21 285-40-21 285 40 21
Figures are calculated from the nominal size. A loaded, rolling tyre runs a few percent smaller, and true widths vary slightly between makes.
What cars use 285/40 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 285/40 R21 tyres
The most recent owner reviews fitted in this size, in their own words.
As I've only had these Potenza Sports fitted for about 4 weeks, I think it's way too soon to provide any kind of feedback as to their performance. I drive a 3 year old VW Touareg 3.0 TDi Black Edition that I've had from new. It came with Bridgestone Alenzas all round. After over 3 years and 31000 miles, the back tyres still have 4mm of tread depth left on them - to say I am pleased is an understatement. I've had to obviously replace the front tyres, and just recently, due to a slight mix up with my tyre supplier, I've ended up with Potenza Sports on the front. My car was due into my local VW retailer last week, and as part of the service, they carried out a vehicle health check. To my horror, their report stated that the front tyres only had 6mm tread depth!! Having done some research into this, I have been informed by Bridgestone that new Potenza Sports are supplied as new with only 6mm tread depth. They say that these tyres are made using new 'Enlighten Technology' and that they should provide the same wear as my Alenzas. Time will tell, but I just wondered whether the drivers who have already provided reviews know that their new Potenza Sports are supplied with only 6mm tread depth when new. It may be that I am behind the times - if so, I apologise to all who read this for wasting your time.
I was looking for a good brand tyre without a major cash outlay. After asking my mechanic and searching reviews I agreed to go with Dynamo. As I drive a big and powerful car I was looking for something high performance and grippy. To be fair Dynamo ticks all the boxes. They look great, perform great and stop when you want them to stop! Big thumbs up from me! Will buy again 100%
Drive on 285/40 R21 tyres?
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.
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.