FLAT conditions will ensure quick racing through the forest at Ewen Maddock Dam this weekend, according to elite Marcoola athlete Brodie Gardiner.

He is among the leading lights competing in tomorrow's Queensland TreX Championships at Landsborough, which is the hallmark event of the weekend featuring a 1500m swim, 30km mountain bike and 10km trail run.

"The bike is going to be one of the quickest courses we have done," Gardiner said.

"It is non-technical and pretty much dead flat...compared to the races that we have been doing overseas."

Gardiner comes into the event full of confidence after his inaugural elite victory at Xterra Saipan Championship in the Northern Mariana Islands last month and having used the area many times during training.

But he will face stiff competition from 31-year-old Wollongong native and 17-time Xterra champion Ben Allen, along with Brisbane's Max Neumann.

"I've haven't raced since Saipan and it's always hard to gauge where you are," Gardiner said.

"I have ridden it (the course) a number of times, and I have seen the run.

"On the bike is just a matter of how much speed you can carry through some of those corners. Any beginner can go out there and ride it."

Large participant numbers are expected as it's the final qualification round for the 2016 world championships which will be staged on home soil in the Snowy Mountains during November.

There will also be standalone trail runs (4km and 8km) tomorrow afternoon and mountain bike races on Sunday morning (20km and 50km). Some athletes will compete in three events vying for short and long course Dirt Master and Dirt Mistress titles when cumulative times are totalled.

Allen will not only be chasing TreX honours but he is also gunning for the Dirt Master title, and in the process aiming for a slice of history.

If successful, he will be the first elite male and only second athlete in the event's six-year history win all three Dirt Master titles since Brisbane's Connie Silvestri claimed all three with wins in Victoria, New South Wales and Queensland in 2012.

Beerwah's Damien Collins won the Dirt Master title last year, but injury has prevented him from defending the title.