I have these on my Taycan Turbo GT. 265/35 21 front 305/30 21 rear. This is the second heaviest performance car I own, behind a Panamera Turbo S E-hybrid. My biggest shock is how long they have lasted. I hammer them. The fronts are losing a little butt quicker than the rears (perhaps undersized to increase range) and they can slide about a bit when cold. These things look like they might go 12,000 miles! They need some heat for a proper launch but again with the amount of burnouts I've done on them I'm simply shocked at their longevity.
305/30 R21 Tyres
Everything we know about the 305/30 R21 tyre size: 7 owner reviews covering 31,800 miles of driving, and EU label data for the tyres you can actually buy in it.
- 7owner reviews
- 31,800 milescovered on them
- 50tyres made in this size
305/30 R21 EU tyre label data
EU label values are declared for each individual size, so the figures here are exact for 305/30 R21 rather than a range across a model. 40 tyres carry label data in this size. The most common load index is 104 (up to 900 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). 11 tyres in this size carry the 3PMSF severe snow marking.
A Best wet grip
23 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
- Continental SportContact 7 Summer 9.7
- Hankook Ventus Evo Summer 9.4
- Kumho Ecsta Sport S PS72 Summer 9.3
- Bridgestone Potenza Sport Summer 9.3
- Hankook iON Evo Summer 9.3
A Lowest rolling resistance
The most fuel efficient choice: 4 tyres in this size reach rolling resistance class A. The highest scoring on Tyre Reviews:
- Hankook iON Evo Summer 9.3
- Bridgestone Potenza Sport Summer 9.3
- Pirelli P Zero Summer 8.8
- Hankook Ventus iON S Summer
69dB Quietest tyres
The quietest 305/30 R21 tyres are labelled at 69 dB external noise:
- Hankook iON Evo Summer 9.3
- Pirelli P Zero Summer 8.8
- Hankook Ventus iON S Summer
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 305/30 R21 mean?
A 305/30 R21 tyre is 305 mm wide, its sidewall is 30% of that width (92 mm) tall, and it fits a 21 inch wheel. That gives an overall diameter of roughly 716 mm.
| Section width | 305 mm |
|---|---|
| Sidewall height | 92 mm |
| Rim diameter | 21" (533 mm) |
| Overall diameter | ≈ 716 mm |
| Circumference | ≈ 2,251 mm |
| Revolutions per km | ≈ 444 |
| Revolutions per mile | ≈ 715 |
Also written as
305/30R21 305/30 ZR21 305-30-21 305 30 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 305/30 R21 tyres?
The cars most often running this size in our owner reviews. Each links to the best rated tyres for that exact car.
Every tyre reviewed in 305/30 R21
The complete record, including discontinued tyres and tyres with too few reviews to rank, ordered by the amount of evidence. A further 5 tyres have a single review each; they count toward the totals but are not listed.
| Tyre | Season | Owner rating | Reviews | Distance reviewed |
|---|---|---|---|---|
| Continental SportContact 7 | Summer | 94% | 2 | 5,200 miles |
Reviews only cover part of the market: 50 tyres are made in 305/30 R21. Browse every 305/30 R21 tyre →
What drivers say about their 305/30 R21 tyres
The most recent owner reviews fitted in this size, in their own words.
Do not be fooled. This is the best UUHP tyre in the market at the moment. It is astonishing that a tyre can be so excellent in the dry and in the wet at the same time. Very high limits, very good braking, great balance, sporty and friendly at the same time. It really does not give away anything at all. Comfort level is very decent, noise is ok. But what has really blown me away is the wear. After obliterating a handful of Pirellis, my tyre abusing Taycan has finally met its match. In a sentence it is the best road tyre I have ever driven.
Fitted the Trofeo RS Elect on the Taycan GTS for a track day. Traction is IMMENSE. Braking is IMMENSE. Road feedback is absolutely fantastic. You immediately connect with the tyre and you can confidently push to the limit and beyond. All its performance characteristics in the dry are truly exceptional. Lap times did not seem to get affected much by heat, the car could consistently run consecutive laps of around the same time. Unfortunately though the Taycan is a tyre destroyer even when driven properly. The tyres gave up very quickly. Alignment was set at the very limit of the settings suggested by Porsche. A bit aggressive but within factory limits. Around 2,4 bar back & forth seems to be optimal for the Taycan even though I did not really have the time to figure out exactly what was right. Overall, a thrill ride but a very short one.
Replaced the OEM Pirelli PZ4 NF0. I had doubts for the longest of time, since the Taycan is really heavy and the OEM Pirelli is designed for this car with stiffer sidewall to handle this extra weight. Boy was I wrong. The SC7 is really spectacular with better steering feel, better braking, noticably better traction and a bit more progressive. It also understeers less than the Pirelli. The only thing I miss from the Pirelli is that super quick steering response, but the Continental is not that far off. Comfort is also better. Pretty much everything is better except for steering response. Impressive tyre.
OEM tyre for the Taycan GTS. Quite a ride I had with these tyres. The Taycan is nothing to play with. It is a 600hp, 2,3 tone, elecric beast with instant torque. This NF0 version of the PZ4 can really hold its own ground against this car. Dry performance is excellent, you can pretty much do whatever you want to do. Traction is great, balance is great, steering is delightful even when you push really hard. Really love it. My only complaint is that it is a bit clumsy when it begins to slide. You get used to it through, it is not something really scary. Wet perfomance is equally good. A click below dry performance but very good overall. Comfort is kind of average, same goes for noise, it is actually a bit noisy. I really liked this tyre, until...I decided to try dry drifting. The tyre was literally torn to pieces after 4-5 minutes (not consecutive). Half the tyre was gone after this very short session. It really cannot handle it and I am quite surprised that it is approved by Porsche for OEM. Did the same thing with different tyre setup and it was just fine (considering the weight of the car). I bought a second pair right after and tried wet drifting this time. Same thing! Much less this time, but a few tyre blocks were once again detached. I now have a weird love and hate relatiosnhip with this tyre. Will not buy them again, even though I admire what they can do.
Stock tyres on the Porsche 992 911. Incredible grip in dry and wet.
Drive on 305/30 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.