Given this is one of extremly few tires in the size i needed its a great tire. pushing 420 hp to the rear wheels of my porsche 911 it never let go until it was worn down, and then just in wet conditions. its a safe well handling tire with great even wear, the 911 is know for wearing down the insides.
315/30 R18 Tires
Everything we know about the 315/30 R18 tire size: 1 independent tire tests conducted in this exact size, 4 owner reviews covering 38,600 miles of driving, and EU label data for the tires you can actually buy in it.
- 4owner reviews
- 38,600 milescovered on them
- 1tests in this size
- 17tires made in this size
Independent tire tests in 315/30 R18
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 R18 - 1 in total, newest first.
Summer tire tests
| Year | Test | Winner | Tires tested |
|---|---|---|---|
| 2024 | Hoosier TrackAttack Pro vs R7 vs Slick Tire Reviews test | - | 3 |
315/30 R18 EU tire label data
EU label values are declared for each individual size, so the figures here are exact for 315/30 R18 rather than a range across a model. 4 tires carry label data in this size. The most common load index is 98 (up to 750 kg per tire). Speed ratings on offer: (Y) (301 km/h), Y (300 km/h), W (270 km/h).
A Best wet grip
3 tires in this size hold the top EU wet grip rating, class A. The highest scoring on Tire Reviews:
- Hankook Ventus S1 evo 3 Summer 8.9
- Yokohama Advan A052 Summer 8.1
- Pirelli PZero Rosso Summer 6.6
B Lowest rolling resistance
The most fuel efficient choice: 1 tires in this size reach rolling resistance class B. The highest scoring on Tire Reviews:
- Vitour Tempesta P1 Summer 8.5
73dB Quietest tires
The quietest 315/30 R18 tires are labelled at 73 dB external noise:
- Hankook Ventus S1 evo 3 Summer 8.9
- Vitour Tempesta P1 Summer 8.5
- Yokohama Advan A052 Summer 8.1
- Pirelli PZero Rosso Summer 6.6
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 R18 mean?
A 315/30 R18 tire is 315 mm wide, its sidewall is 30% of that width (95 mm) tall, and it fits a 18 inch wheel. That gives an overall diameter of roughly 646 mm.
| Section width | 315 mm |
|---|---|
| Sidewall height | 95 mm |
| Rim diameter | 18" (457 mm) |
| Overall diameter | ≈ 646 mm |
| Circumference | ≈ 2,030 mm |
| Revolutions per km | ≈ 493 |
| Revolutions per mile | ≈ 793 |
Also written as
315/30R18 315/30 ZR18 315-30-18 315 30 18
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 R18 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 R18 tires
The most recent owner reviews fitted in this size, in their own words.
315/30R18 (200tw) on the rear and 265/35R18 (180tw) on the front. 600 WHP Toyota Supra. I was pleasantly surprised with these tires. I wasn't expecting much given the price tag but they have performed better than expected. Started them at 40psi all around but have since dropped to 35psi on the front and 32 psi on the rear, this seems to be their happy spot for my car (1550kg) on good roads. I initially just got them to make sure I could fit a 315 on the rear (rims are 18x11) but I did also want to see if they were going to be a viable tire that I could thrash on. They take abuse very well and are lasting way better than expected. Downsides are the road noise and comfort which is to be expected. The straight line grip is NOT as good as I hoped for given the massive 315 in the rear, but lateral grip is good. When they do lose traction I found it to be quite predictable and very user friendly. These would suit an endurance event, drifting or even daily driving as long as you don't mind the high noise levels at highway speeds. I have not used them in the cold as I live in a very warm climate in Australia. The guys from Apex use them a lot on the Nürburgring for their cars, if it's good enough for them then I would say they are decent tires.
I purchased the Conti Forces in 295/30/18 and 315/30/18 for autocross and track use on my 2017 Z06. This summer I ran eight autocross events and about 1500 road miles on the tires and I've been pleasantly surprised by the life they're providing. Should easily be able to get through next year's track season on the same set. As a 200TW track focused tires, the dry grip is tremendous as expected. Wet grip... exists, but they definitely don't inspire much confidence in the rain at any speed. They are rather loud on anything other than a pristine surface, but that's to be expected. I'll probably try another set when these are worn out, hopefully someone has the 345s in stock at that point.
This tire is amazing for an every day road tire and the occasional track day. It warms up almost instantly and puts the power down well. When it rains I have very little worry as I can still put down all 600whp, stop extremely well and be very confident in the corners, weather its sliding or gripping. Most other semi slicks I have used recently are just down right scary when it comes to wet weather.
I can't think of a better semi slick road tire for the price.
I can't think of a better semi slick road tire for the price.
Drive on 315/30 R18 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.