Same person who reviewed the Trofeo RS on the Taycan. Even though I was not into buying this tire again after the disappointing experience I had with the Taycan (the most expensive 2-miles 25 laps I will ever have), due to availability reasons I had to buy this tire again this time on a 992.1 GT3. And now I am flabbergasted and came to accept that tires are voodoo magic stuff and beyond what I can comprehend. Both versions where car specific, Taycan specific and 992.1 GT3 specific. But on the Taycan the tires were worn like they were some eraser from a bookstore, whereas on the GT3 they were really good and lasted 3 full track days with fantastic and even wear. Yes, alignment settings where different, in favor of the GT3, but I was checking the tires all the time and even when taking that under account, the wear difference was very obvious. Yes, the weight difference of the 2 cars is 850 kgs. Yes, the temperature was better. Still though my overall experience is that the Trofeo RS on the GT3 absolutely rocks, whereas the Elect-Taycan version is not really a tire specifically designed for this car but more of a 'make this tire EV specific'. As said, voodoo magic, I don't really understand how the 'same' tire can have so much difference on different versions for different cars.
Performance wise, once again pure perfection. Like in the Taycan. Balance, braking, traction, steering, everything is as good as it can be. Even though it is most probably the fastest tire you can put on this car, it is decently progressive at the limit. Not much more to say really, the car and the tire were meant for each other. There is not a single thing you can ask to improve.
Alignment was set -3,4 front/-3,1 rear and this is more or less where you get even wear. Will it get even better with more aggressive alignment? Perhaps. I will try it soon.
The Pirellis went back to back with the Nankgang CRS on the same track. The wear of the Nankgangs was unbelievable and lasted 50% more than the Trofeo RS, but I was happy with both. But make no mistake, the Trofeo RS outperforms the Nangang on the 992.1 wing GT3. More stable on weight transfers, better braking, better steering, better traction at optimum temparatures. Heat management wise, they were quite close even though I believe the Trofeo was slightly better (but not too much). Is it worth the extra cost compared to the CRS? If you are in the mood for lap times, it absolutely does. But the Nakgang is cheaper, lasts more and even though it cannot much the Pirelli, it is still a fast tire.
315/30 R21 Tires
Everything we know about the 315/30 R21 tire size: 1 independent tire tests conducted in this exact size, 4 owner reviews covering 5,900 miles of driving, and EU label data for the tires you can actually buy in it.
- 4owner reviews
- 5,900 milescovered on them
- 1tests in this size
- 63tires made in this size
Independent tire tests in 315/30 R21
Tires behave differently as sizes change, so a test conducted in your exact size is the strongest evidence there is. Every test below was run in 315/30 R21 - 1 in total, newest first.
Summer tire tests
| Year | Test | Winner | Tires tested |
|---|---|---|---|
| 2020 | Michelin Pilot Sport Cup 2 VS Cup 2 R - Tested Tire Reviews test | - | 2 |
315/30 R21 EU tire label data
EU label values are declared for each individual size, so the figures here are exact for 315/30 R21 rather than a range across a model. 55 tires carry label data in this size. The most common load index is 105 (up to 925 kg per tire). Speed ratings on offer: (Y) (301 km/h), Y (300 km/h), W (270 km/h), V (240 km/h). 14 tires in this size carry the 3PMSF severe snow marking.
A Best wet grip
26 tires in this size hold the top EU wet grip rating, class A. The highest scoring on Tire Reviews:
- Continental SportContact 7 Summer 9.7
- Michelin CrossClimate 3 Sport All Season 9.6
- Bridgestone Potenza Sport Evo Summer 9.5
- Hankook Ventus Evo Summer 9.4
- Kumho Ecsta Sport S PS72 Summer 9.3
- Falken Azenis FK520 Summer 9.1
B Lowest rolling resistance
The most fuel efficient choice: 7 tires in this size reach rolling resistance class B. The highest scoring on Tire Reviews:
- Michelin CrossClimate 3 Sport All Season 9.6
- Continental WinterContact 8 S Winter 8.5
- Continental WinterContact TS 860 S Winter 8.5
- Vitour Tempesta P1 Summer 8.5
- Bridgestone Turanza 6 Summer 8.4
- Landsail LS588 UHP Summer 3.8
70dB Quietest tires
The quietest 315/30 R21 tires are labelled at 70 dB external noise:
- Michelin Pilot Alpin 5 Winter 9.5
- Hankook Ventus Evo Summer 9.4
- Falken Azenis FK520 Summer 9.1
- Pirelli P Zero Summer 8.8
- Bridgestone Turanza 6 Summer 8.4
- Pirelli P Zero Winter Winter 7.6
Label values come from the EU EPREL database and apply to the EU market versions of each tire. 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 315/30 R21 mean?
A 315/30 R21 tire is 315 mm wide, its sidewall is 30% of that width (95 mm) tall, and it fits a 21 inch wheel. That gives an overall diameter of roughly 722 mm.
| Section width | 315 mm |
|---|---|
| Sidewall height | 95 mm |
| Rim diameter | 21" (533 mm) |
| Overall diameter | ≈ 722 mm |
| Circumference | ≈ 2,269 mm |
| Revolutions per km | ≈ 441 |
| Revolutions per mile | ≈ 709 |
Also written as
315/30R21 315/30 ZR21 315-30-21 315 30 21
Figures are calculated from the nominal size. A loaded, rolling tire runs a few percent smaller, and true widths vary slightly between makes.
What cars use 315/30 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 315/30 R21 tires
The most recent owner reviews fitted in this size, in their own words.
- The first thing to notice is that this tire is incredibly consistent until it is absolutely dead. I believe though that scrubbing in is necessary. Throughout the first few laps traction was all over the place. I have tried 3 similar tires on the same car and the CRS was the one that really required the first heat cycle to start performing well. Obviously scrubbing in is a must for this kind of tires, but the other 2 tires would be good straight from the beginning. CRS was not. But after that initial heat cycle, they performed the same until the very end (the other tires did not). So this is probably the perfect tire to learn a new car. The CRS also did require significant time to warm up and while it is cold it underperforms compared to the other 2 tires I tested. But once it gets to temperature it can hold its performance for consecutive laps.
- Performance wise, it is a well balanced tire and works well with the GT3. Braking is good. Traction is relatively better. By all means it is a fast tire, but not a one lap hero. Steering is probably its only true weakness. You feel it rather heavy in weight transfers and you have to wait a bit until it settles. Trail braking is not too much of an a issue, but accelerating after a direction change is. If you request it to do one thing, it does it well and is very progressive, but when you are pushing hard and start braking & cornering or (even worse) accelerating and cornering after consecutive corners then snap oversteering is around the corner. Need to wait for it a bit... Steering is dead around the center, and there is a bit of a steering delay but once you are there, it provides great steering feedback and you can feel the grip building underneath. Once you are at the limit, you will know. All these probably have to do with the stiff sidewall. To sum it up, steering is very good but only when the tire is settled.
Considering its lower price point, its durability, its consistency and its performance, despite its weaknesses, this is so far the best track tire for someone who wants to enjoy track days with a very good tire and is not really interested in personal lap time records.
Drive on 315/30 R21 tires?
Review your tires 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 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.