Wolff: No "crystal ball" on when Mercedes can beat Red Bull

The heavily revised new W15 was launched at Silverstone on Wednesday morning, ahead of some initial shakedown laps by Lewis Hamilton and George Russell.

Wolff is optimistic about the prospects for the new car, citing a "buzz" in the Mercedes camp, but he acknowledged that it won't be easy to take on the team that has dominated the last two seasons.

"On one hand, you need to be realistic about the odds of beating a team that is a fair chunk ahead under these regulations, and who got things right over the last two seasons whilst we have not," he said.

"There are no miracles in the sport. On the other hand, our ambition is strong. It is Red Bull and a very successful car that are the benchmark we are aiming to beat.

"I do not know when that will happen, we do not have any crystal ball. But we will know soon enough how far ahead they are and the task in front of us."

Wolff made it clear that the team's performance over the first two seasons of the ground effect era has not been good enough.

"We got it wrong with the new regulations," he said. "But when we will be looking back in 10 years, or longer, and you're going to read that we finished first eight times in a row, and then third, and second in the constructors', it will look like it was a respectable result and wasn't so bad.

"But this is not counting another team and another driver winning most of the races.