305/30 R20 Tires
Everything we know about the 305/30 R20 tire size: 7 owner reviews covering 34,500 miles of driving, and EU label data for the tires you can actually buy in it.
- 7owner reviews
- 34,500 milescovered on them
- 90tires made in this size
305/30 R20 EU tire label data
EU label values are declared for each individual size, so the figures here are exact for 305/30 R20 rather than a range across a model. 53 tires carry label data in this size. The most common load index is 103 (up to 875 kg per tire). Speed ratings on offer: (Y) (301 km/h), Y (300 km/h), W (270 km/h), V (240 km/h), Q (160 km/h). 10 tires in this size carry the 3PMSF severe snow marking.
A Best wet grip
27 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
- Bridgestone Potenza Sport Evo Summer 9.5
- Hankook Ventus Evo Summer 9.4
- Michelin Pilot Sport 4 S Summer 9.4
- Kumho Ecsta Sport S PS72 Summer 9.3
- Bridgestone Potenza Sport Summer 9.3
B Lowest rolling resistance
The most fuel efficient choice: 2 tires in this size reach rolling resistance class B. The highest scoring on Tire Reviews:
- Continental WinterContact TS 860 S Winter 8.5
- Vitour Tempesta P1+ Summer 4.8
69dB Quietest tires
The quietest 305/30 R20 tires are labelled at 69 dB external noise:
- Pirelli P Zero Summer 8.8
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 305/30 R20 mean?
A 305/30 R20 tire is 305 mm wide, its sidewall is 30% of that width (92 mm) tall, and it fits a 20 inch wheel. That gives an overall diameter of roughly 691 mm.
| Section width | 305 mm |
|---|---|
| Sidewall height | 92 mm |
| Rim diameter | 20" (508 mm) |
| Overall diameter | ≈ 691 mm |
| Circumference | ≈ 2,171 mm |
| Revolutions per km | ≈ 461 |
| Revolutions per mile | ≈ 741 |
Also written as
305/30R20 305/30 ZR20 305-30-20 305 30 20
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 305/30 R20 tires?
The cars most often running this size in our owner reviews. Each links to the best rated tires for that exact car.
Every tire reviewed in 305/30 R20
The complete record, including discontinued tires and tires with too few reviews to rank, ordered by the amount of evidence. A further 5 tires have a single review each; they count toward the totals but are not listed.
| Tire | Season | Owner rating | Reviews | Distance reviewed |
|---|---|---|---|---|
| Michelin Pilot Sport 4 S Replaced by Michelin Pilot Sport S 5 | Summer | 93% | 2 | 12,000 miles |
Reviews only cover part of the market: 90 tires are made in 305/30 R20. Browse every 305/30 R20 tire →
What drivers say about their 305/30 R20 tires
The most recent owner reviews fitted in this size, in their own words.
I LOVE THEM!
However I really like Pirelli P-Zero. They are superbly made, of the nicest construction quality, and really good all round.
They look very nice, with an attractive modern asymmetric pattern. Their roadholding is very good, and the comfort levels in terms of noise and harshness are also great. I've not had them long enough to establish longevity and wear rates however. They do have a nice sidewall design with an integral yet unobtrusive kerb-protector. Not all high-performance tires even have this, and it's a very useful feature for any road car.
All in all, in the "ultra-high performance" segment the P-zero is kind of ignored against the Michelin and Goodyear brands, who all have a very vocal fan-base.
But it's worth remembering that the P-Zero is OEM fitment on Porsche, Ferrari, Jaguuar, McLaren, Audi to name but a few.
The only problem with P-Zeros is the confusing nature of the range. Each OEM fitment mentioned above has a specific tire in each size, so you need a tire marked N0 for Porsche, MC1 for McLaren etc. This can get confusing when changing them, and often great cost differences exist even with the same tire sizes.
Another thing is the P-Zero is a particular tire in the P-zero range. There are also P-zero Rosso (comfortable and quiet with soft tread), Nero (ultra-low profile for aftermarket fitments), Silver (hard tread for high mileage users), and System (different tread types front and rear), and corsa (road/race fitment)
This review is for the basic P-Zero, which as mentioned is an all rounder for any high-performance car that comes in a large variety of sizes.
It's a great all round tire that should please everybody. I have them on the back of my Porsche Boxster now, and have just bought two more for the front.
Drive on 305/30 R20 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.

