Sebastian Vettel Not Alone in Calling Pirelli's F1 Wet Tires 'Junk'

• The recent F1 Japanese Grand Prix was the latest Formula 1 race to be red-flagged of have its start delayed because of rain.

• Fans, and even some drivers, are wondering why the series seems to be more averse to racing in rain than at almost any time in F1 history.

• Tire manufacturer Pirelli says teams not making the best use of practice time in wet conditions is at least partially to blame.

Tire supplier Pirelli is deflecting driver complaints about the quality of Formula 1's rain tires back onto the teams.

After the F1 Japanese Grand Prix at Suzuka, fans were once again wondering why the sport seems so adverse in the modern era to racing in very wet conditions. The finger of the drivers was pointed straight at Pirelli, with Sebastian Vettel insisting that the red flag was waved at Suzuka because drivers struggled to cope with the Intermediate tires.

"We are forced to go on the intermediates because the rain tires are junk—sorry, not so good. So we push ourselves from one emergency to another. The whole field was driving on the wrong tires," the four-time world champion added.

"We are all responsible for that, but we have an intermediate that is so much faster than the wet tire. The wet is better for the conditions but so slow that you're forced to be on the next tire. That needs to be improved."

Current back-to-back world champion Max Verstappen agreed.

"I didn't want to take a dig, but I think we need better rain tires," said the Red Bull driver. "You saw what we could do in the 90s or the early 2000s with the amount of water on the track.

"I'm very happy to do a few test days to try all different kinds of tires because we need better rain tires. The extremes are just slow and they don't really carry a lot of water away. If you compare to 20 years ago, it was perfectly fine in the wet. So there must be a solution. But like I said, this is not criticism because I'm very happy to help out."

Pirelli's F1 director Mario Isola, however, says the main problem is that wet-weather testing is now so rare in Formula 1.

"We only have one compound for the rain tires and one for the intermediates," he said. "And they have to work everywhere—on 22 different tracks. So we have to find the best compromise.

"Honestly we don't have many opportunities to test the rain and intermediate tires. We work with the FIA and the teams, but if we don't have the opportunity to test the tires then we don't have the opportunity to develop them either."

And even when there is wet-weather testing, Isola says the teams remain more focused on performance.

"If you remember the preseason tests in Barcelona, we wet the track for half a day but the extreme wet was used very little," Isola said.