Bought into the hype and picked up a set of P1s for my C7 Z06 before the 2025 Autocross and Track season, 315/30/18 front and 345/30/18 rear. Coming from a set of Conti ECFs, I was amazed at the sheer mechanical grip these tires could provide when conditions were right. They needed a lot of heat and really didnt work well at colder events, but at a big track HPDE, they were excellent. They lasted me a full season of autocross and one HPDE weekend with a smattering of street driving but were pretty well cooked by the end of the year.
345/30 R18 Tires
Everything we know about the 345/30 R18 tire size: 1 owner reviews covering 5,000 miles of driving, and EU label data for the tires you can actually buy in it.
- 1owner reviews
- 5,000 milescovered on them
- 1tires made in this size
345/30 R18 EU tire label data
EU label values are declared for each individual size, so the figures here are exact for 345/30 R18 rather than a range across a model. 1 tires carry label data in this size. The most common load index is 107 (up to 975 kg per tire). Speed ratings on offer: Y (300 km/h), W (270 km/h).
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
74dB Quietest tires
The quietest 345/30 R18 tires are labelled at 74 dB external noise:
- Vitour Tempesta P1 Summer 8.5
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 345/30 R18 mean?
A 345/30 R18 tire is 345 mm wide, its sidewall is 30% of that width (104 mm) tall, and it fits a 18 inch wheel. That gives an overall diameter of roughly 664 mm.
| Section width | 345 mm |
|---|---|
| Sidewall height | 104 mm |
| Rim diameter | 18" (457 mm) |
| Overall diameter | ≈ 664 mm |
| Circumference | ≈ 2,087 mm |
| Revolutions per km | ≈ 479 |
| Revolutions per mile | ≈ 771 |
Also written as
345/30R18 345/30 ZR18 345-30-18 345 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 drivers say about their 345/30 R18 tires
The most recent owner reviews fitted in this size, in their own words.
Drive on 345/30 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.