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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 To scale, mm
Ø 691 305 92 20" 92

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:

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:

69dB Quietest tires

The quietest 305/30 R20 tires are labelled at 69 dB external noise:

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.

305/30 R20 nominal dimensions
Section width305 mm
Sidewall height92 mm
Rim diameter20" (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.

Comparing two sizes? Use the tire size calculator →

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.

All tires reviewed in 305/30 R20
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.

99%
Bridgestone Potenza Sport Evo 305/30 R20 Porsche 2,000 miles May 17, 2026
I replaced Potenza Sport with Potenza Sport Evo to my tuned 911 Turbo S. Bridgestone has improved almost all details as better handling in high speed, wet grip and control in extreme wet roads. For me this is the fastest tire in wet conditions. Compared to Michelin PS 4S, Sport Evo is much better tire.
89%
Dunlop Sport Maxx Race 2 305/30 R20 Porsche Porsche 991.2 911 GT3 6,000 miles March 25, 2026
My car came with these original fit in N rated Porsche spec. I've since had Michelin Cup 2 and PS4 on teh car, but keep trying to find the Race 2 as it is definitely as good as or better than teh Cup 2, but has better wear and high temperature stability. It would appear however that after 2018 Dunlop stopped making this tire in any comemrcial quantity making it pretty much impossible to find at least in Australia, or UK in Porsche sizes.
97%
Michelin Pilot Sport 4 S 305/30 R20 BMW M5 8,000 miles September 21, 2019
If you're thinking of buying some high performance summer tires just stop looking and buy these, iv had them on my last 3 cars (w204 c63, F80 M3 and now F10 M5) and wouldn't change them for anything. Been 190+ on the autobahn (no drama what so ever!) and even a few laps on the ring, nearly 8000 miles later and i still have 6mm tread, that's on a 700bhp M5!
I LOVE THEM!
89%
Michelin Pilot Sport 4 S 305/30 R20 Jaguar F Type coupe 4,000 miles November 6, 2017
Put these on the F-Type after removing the standard fit P-Zeros - the difference is night and day. Better grip in all conditions - trying to put the power down in a straight line in damp conditions was impossible with the Pirellis but these really dig in. It's a 550hp RWD car so of course you can light them up but it's genuinely impressive how the 4Ss handle the power. At the limit they are much more progressive than the Pirellis ever were - you feel them start to give way and can react - to have a scary moment in the wet with these tires requires massive commitment / stupidity. Again with the P-zeros it just required you to want to accelerate before the car was arrow straight. Honestly I've not got close to the limit in the dry, but the feel is more communicative and they are quieter and more comfortable than the P-zeros they replaced. Just a massive upgrade in every department. Not sure about wear yet but they are sold with a much better wear rating off the shelf.
86%
Pirelli P Zero 305/30 R20 Porsche BOXSTER 2.7 1,000 miles March 28, 2014
The P-zero does not get a lot of rave reviews, and many enthusiast drivers bang on about other brands from the "Premium" suppliers.

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.

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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.

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