Red Bull will try out a new rear aerodynamic part at this weekend's Turkish Grand Prix to help maintain its lead over closest rivals McLaren and Ferrari.
Overall Formula One leader Mark Webber said Thursday the Austrians will debut their F-duct wing _a device that produces greater speed on straights _ in Friday practice.
Webber, who shares 78 points with Sebastian Vettel but leads with two victories to his teammate's one, believes McLaren will be Red Bull's biggest worry at the "Otodrom."
"Lewis (Hamilton) was our closest competitor at Barcelona, so I think McLaren might be the guys that challenge here," the Australian driver said. "We're also mindful of Ferrari and Mercedes.We're definitely not taking anything for granted."
After Monaco's street race, F1's calendar returns to its regular circuits with Hamilton's strong performance at the race before last _ the Spanish GP _ putting McLaren in contention, especially as the innovator of "F-duct" part.
"It's about making the most of it while you have the advantage," McLaren driver Jenson Button said. "The part should work well around here. Hopefully they will be playing around with that all weekend."
Ferrari will also fit the rear part to its car after removing it for Monaco, where Fernando Alonso finished sixth after starting last. But unless misfortune strikes, two-time world champion Alonso believes Red Bull will not be caught before the next race in Montreal.
"There are no magic surprises here. Red Bull are clear favorites, we just need to close the gap to them and fight to stay on top of the others," Alonso said ahead of the Italian team's 800th race in F1. "It's a feeling (the teams) all have here. They are clearly ahead of everybody."
Red Bull's superiority, however, has not always translated into victories this season. It has taken pole position in each of the seven races this season but has only three wins.
Alonso trails the leading pair with 75 points, Button has 70, while Hamilton and Robert Kubica of Renault share 59 points. Felipe Massa, a three-time winner here, has 61.
Red Bull has changed Vettel's chassis for the race.
"In the last two races something wasn't feeling right, it's not that we're massively clear on what it was," Vettel said. "In terms of performance we're looking strong but I'm not a fan of using words like untouchable. In the span of a few races this can change."
Button was the last driver to win three straight races on his way to the title last season with Brawn. The Briton believes Red Bull can be caught out as he eventually was, perhaps.
"There's a lot of pressure when you're out in front. You take risks," Button said. "(Brawn) never had an advantage like Red Bull has now. There was always a car that was as quick as us. But they weren't as reliable nor consistent,."
Meanwhile, Michael Schumacher hopes his car's upgrades will put Mercedes in touch with the group of leaders. Schumacher was dropped out of the points at Monaco for an illegal overtake of Alonso, while teammate Nico Rosberg remains in touch of the leaders with 56 points despite two straight disappointing results.
"I hope we have another little step of development that moves us closer to this group," Schumacher said. "It's interesting from our point of view what can happen this weekend."
Kubica has been the biggest surprise so far as the Polish driver has two top-three finishes, including a third place at Monaco. But the French team isn't expecting a front row start for Sunday's 58-lap race at the Istanbul Park Circuit.
"We have to remain realistic _ we won't repeat that result here," Kubica said. "Maybe the outside perception was that Renault was going through difficult times. So we can be happy about the start of our season and the job we are doing."
There are three practice sessions before Saturday's qualifying for the race, which is being held on the Asian side of the Bosphorus river for the sixth time.