Inside the technical challenge of 18-inch F1 tires

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Lotus technical director Nick Chester has shed some light on the challenge that the engineers and designers in Formula 1 could face if Pirelli’s prototype 18-inch rimmed tires are adopted in the years to come.

Pirelli piloted the concept tires at Silverstone earlier this week, with Lotus test driver Charles Pic completing 14 laps using them. The Frenchman said that it would be a big challenge for the sport if they were used, and Chester echoed his words.

“The 18-inch Pirelli tires are obviously very different to the tires used in F1 now, so we viewed it as a shakedown run – simply a case of ‘let’s see’ for Pirelli, rather than a performance run,” he explained.

“The bigger size meant we had to trim the floor and change the ride height to adapt to the different loaded radius of the tires. Some of the suspension set up also had to be modified, such as the cambers. These were very basic revisions to enable Pirelli to evaluate the concept for the future and see what the bigger wheels look like on the car.”

If the tires are to be adopted in F1, all eleven of the teams would have to be in favor, and they would not be introduced until 2016 at the absolute earliest. Chester inferred that such a big lead-up would be required thanks to the challenge posed by the tires.

“Having 18-inch tires would have a big impact on design,” he said. “We would want to be testing in the wind tunnel for at least a year ahead of their introduction.

“The ride height and suspension packages would have to be changed and the tire profile itself would be very different. It would be an interesting challenge.”

Bourdais hopes last year’s crash turns into Indy 500 Cinderella story on Sunday

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Sebastien Bourdais has relived his May 20, 2017 crash during Indianapolis 500 qualifying over and over in his mind, day after day, week after week and month after month.

He would think of the worst crash of his open-wheel racing career at least once — if not several times — a day, particularly when he’d experience a slight twinge of pain.

“I think about it every day,” Bourdais told MotorSportsTalk. “Even though I’m functionally 100 percent now, it’s still very rare that during the day that there’s not a little pinch or something that reminds me of what happened.”

But this past weekend while qualifying for this year’s 500, one year later, the French driver said he was finally able to work past the mental roadblock that just would not leave his mind.

The solution was simple: complete the task he wasn’t able to do so last year, namely, qualifying for the race – and qualifying well.

Bourdais will start fifth in Sunday’s 102nd Running of the Greatest Spectacle In Racing, in the middle of Row 2.

“(Last year’s crash is) still in my mind,” Bourdais said. “But I think the biggest hurdle, at least mentally, was qualifying last weekend, putting yourself back in the same set of circumstances, going back on the line there.

“It felt a little bit the same, chances of rain, some rain, delays, you get back in line, conditions change, everything gets harder because it gets hotter, but that’s the biggest hurdle to overcome. After that, it’s back to business.”

Bourdais has already won once in 2018 – the season-opening race in his adopted hometown of St. Petersburg, Florida.

It helped jump start him to a strong overall run in the first five races of the season, including a fourth-place showing two weeks ago at the INDYCAR Grand Prix of Indianapolis, coupled with entering the 500 third in the Verizon IndyCar Series standings.

Now, he wants to win the biggest race of his career. If he does so, he’ll feel as if he finally and completely has come full circle from last year’s devastating wreck that shattered his pelvis, going head-on into the Turn 2 wall at a reported 228 mph.

“Well, it’s the Holy Grail of IndyCar, it doesn’t really get any bigger than that,” Bourdais said of the 500. “It’s the biggest achievement that you can accomplish in IndyCar.

“I don’t think I’m any different than anybody else: we all want to win it pretty bad, but I’m sure after what happened after last year, it’d be a Cinderella story.”

But there’s a caveat to Bourdais writing that story: “There’s 32 other drivers that want to accomplish the same thing, and it’s a one day event. We’ll give it our best shot … you can only give your very best and see what happens on that given day.”

Bourdais has a lot going for him heading into Sunday. First off, he’ll start from the highest qualifying position he’s ever had in what will be the seventh Indy 500 of the 39-year-old’s racing career.

Second, his confidence and comfort level are higher than they’ve ever been coming into the annual classic at the 2.5-mile Brickyard oval.

Third, he’s forgiven himself – not IMS – for what happened last year. He has no ill feeling towards the racetrack, nor does he seek revenge. If he were to start thinking that way, it would serve no positive purpose.

“No. I’m not really that way,” he said when asked if he wants revenge over the racetrack. “The track didn’t beat me up, I beat myself.

“The bottom line is there were a couple of reasons why it happened, but I got more comfortable and more confident and confidence and comfort at some point just bite you at Indy.

“You just do your laps, you get into such a rhythm and the week had gone perfectly with an awesome car and there was not a doubt in my mind it was going to stick (going into Turn 2), and that’s when it happened – and I paid the price.”

So, Bourdais is simply going to go out and race, again, hoping to complete what he started last year before being so painfully derailed.

His best finish to date in the 500 has been seventh (2014). He just needs for his Dale Coyne Racing with Vasser – Sullivan Honda to finish six places higher on Sunday.

And if he does, his move to Dale Coyne Racing last year – he’s competed in 13 of 23 races with two wins, 3 podiums and one pole – would only serve to make what already has proven to be a great move into a potentially brilliant move.

Because, yes, Bourdais isn’t just thinking Indy 500 win, he’s also thinking of a potential championship this season.

“I sure hope so,” Bourdais said when asked if his team’s success will continue. “I like to say it’s (the success that the Coyne camp has had since he came there) a little bit of my baby, bringing in Craig (engineer Craig Hampson) and Olivier (race engineer Olivier Boisson) and reinforcing the existing crew.”

Bourdais is no stranger to winning championships. He won four straight combined titles in CART and the Champ Car World Series from 2004 through 2007 (he also won 28 races in that four-year span).

“Obviously, it’s one thing to get into a winning team and basically meet expectations,” Bourdais said. “It’s another thing to try and build something and change the status of the underdog and turn him into a contender week in and week out.

“We got a glimpse of that last year, and this year, we’ve been competitive every weekend so far, and that’s a great feeling. Once you’re able to be competitive on street course, road courses, short ovals and superspeedways, then you can start saying and thinking championship.”

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