Australian Olympic Committee chief John Coates believes the swim team is on track to improve on their record medal haul from Athens at this year's Beijing Olympic Games.

Coates says the AOC's medal calculations have not changed following world record breaking trials performances in the pool in Sydney this week.

The swim team broke eight world records, six in Olympic events, during the trials and are looking to build on their Athens haul of seven gold, five silver and three bronze medals.

Pre-trials rankings had the swim team bringing home 18 medals in Beijing, and Coates said those expectations were still just as high considering their phenomenal form four months out from the Games.

"We've shown the performances of our sports last year and it calculated around 45 (medals) and they were predicated with the case of swimming on 18," said Coates.

"Nothing here has concerned me about not getting those numbers."

Australian head coach Alan Thompson is expecting the upcoming trials for other nations, most notably USA in late June, to seriously challenge some of the recent performances by his team but says the ultimate judgement will be made in China.

"How good we are will be decided on the 18th of August (last day of swimming)," said Thompson.

"As of now we have put a good performance on the board."

Australian Swimming on Saturday night nominated a 42-person team for the Beijing Olympics, to be captained by dual champion Grant Hackett.

Hackett is one of four swimmers heading to his third Olympic Games alongside sprinter Ashley Callus, butterflyer Adam Pine and breaststroke queen Leisel Jones.

There are 26 rookies named in the team of 20 men and 22 women.

Veteran Pine said 2008 selection felt just as special as his previous Olympic teams and urged his fellow teammates to enjoy the moment.

"It is just as exciting as ever," said Pine.

"You're an Olympian forever, so just enjoy it and keep smiling."

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