Pirelli admit they “underestimated” effect of tire swapping

2 Comments

Pirelli’s motorsport director Paul Hembery has admitted that the Italian tire supplier underestimated the effect of allowing teams to undertake ‘tire swapping’ at the last race, believing that this was the biggest factor in causing the multiple failures at the British Grand Prix.

Lewis Hamilton, Felipe Massa, Jean-Eric Vergne, Sergio Perez and Esteban Gutierrez all suffered from blowouts during the race at Silverstone, triggering Pirelli to make changes for this weekend’s race. Hembery has admitted that it was a mistake by Pirelli which caused the madness to ensue.

“Just to recap, at Silverstone we’d underestimated the impact of swapping the tires,” Hembery said in the Friday press conference. “The cars were two, maybe three seconds quicker this year. Whilst we’d allowed the teams to do that, we’d underestimated the impact on the tire.”

Teams have been permitted to switch which side of the car they run the Pirelli tires on – i.e. using the front-left tire on the front-right of the car – and it has aided tire management, reducing wear in places. However, Hembery explained how this has caused a weakness in the tire which was evident at Silverstone.

“When you swap them around that creates a point with the metallic belt that we have on it, on the left hand side, the camber side, and that created the weakness.We got that wrong and we needed to get it right going forward.”

As a result, Pirelli have changed the structure of the tire, using a kevlar belt in the tire before reverting to the 2012 constructions for the Hungarian Grand Prix at the end of this month. The process of tire swapping has been banned for this weekend by the FIA following guidance from Pirelli.

IndyCar 2017 driver review: Ed Carpenter

Getty Images
Leave a comment

MotorSportsTalk continues its annual review of the Verizon IndyCar Series drivers that raced in 2017. The 2017 season behind the wheel was better for Ed Carpenter than either of the last two years, but still wasn’t ideal results-wise in his six oval starts.

Ed Carpenter, No. 20 Ed Carpenter Racing Chevrolet

  • 2016: 25th Place (5 Starts), Best Finish 18th, Best Start 5th, 0 Top-5, 0 Top-10, 1 Lap Led, 11.2 Avg. Start, 21.8 Avg. Finish
  • 2017: 22nd Place (6 Starts), Best Finish 7th, Best Start 2nd, 0 Top-5, 1 Top-10, 5 Laps Led, 11.3 Avg. Start, 12.3 Avg. Finish

Ed Carpenter’s 2017 season was largely one of frustration, both behind the wheel and as a team owner.

While a respectable turnaround in results occurred – Carpenter finished between seventh and 12th in five of his six oval races after a nightmare season of ending 18th or worse in each of his 2016 starts – this is still not what he sets out to strive for in the races he does. Lost opportunities loomed larger than any official result he or the Ed Carpenter Racing team achieved.

Carpenter and new teammate JR Hildebrand, in for the departed Josef Newgarden, dominated preseason testing in Phoenix but Hildebrand could only muster third in the race, Carpenter a season-best seventh. Then at Indianapolis, Carpenter (second) and Hildebrand (sixth) flew the flag for Chevrolet in qualifying and practice pace, but they fell to 11th and 16th on race day owing to a front-wing change and late-race penalty for passing before a restart.

Both drivers got collected in incidents at Texas. Hildebrand qualified and finished a season-best second in Iowa but that result came only after the ECR crew rebuilt his car from a crash in practice. Then Carpenter had a practice crash in Pocono and despite a rapid rebuild, they missed the clock to qualify by mere minutes and were unable to do so. Carpenter’s spin on a slick Gateway track at the start of the race sent him over Will Power’s nose assembly in one of the scarier looking incidents of the year, although fortunately he was OK.

In a similar refrain as we often write, it’s not that Carpenter’s lost his ability to drive and he remains one of the series’ savviest and smartest people in the paddock. There have been a lot of extenuating circumstances of late, and it almost felt as though this team had “empty nest” components. Since September, Carpenter has had to secure his team’s future with a move away from its Speedway, Ind. shop, line up Spencer Pigot for a full-time drive replacing Hildebrand in the No. 21 car, find a new road/street course driver in the No. 20 car, and manage both driving and owning himself.