Mountain bikers can test their mettle during the Kooralbyn Valley MTB 4 Hour Enduro race on Sunday from 9am.
The cross country marathon event is open to teams of two and individuals, with competitors completing as many laps of the 10 kilometre course in the allotted time period as possible.
On The Edge Events race director Andrew Bonney said the first round of the 2019 Kooralbyn Valley MTB Series catered to all abilities and skill levels, and entrants could expect hotly contested racing.
He said it was expected at least 100 athletes would take part led by avid adventurer and accomplished endurance rider Russel Worthington.
"There will be the fast guys up the front but also plenty of everyday riders," he said.
Mr Bonney said the challenging course would test an array of mountain biking skills, with jumps, rocky sections, tough climbing and technical downhill runs, as well as smooth flowing areas where riders could put the foot down.
He said there would also be a category for those choosing to use electric mountain bikes, which were rapidly growing in popularity.
"The course has got everything," Mr Bonney said.
"It is 99 per cent single track, which is special. Not a lot of marathon events are held on single track."
Mr Bonney said the race would also make a great spectacle and he encouraged anyone interested in the adventure sport to head along and check it out.
He said the MTB series differed from other mountain biking events because it was dedicated to endurance races of at least four to 24 hours in length with all of them to be held locally within the Scenic Rim.
"There are no other series that specialise in endurance and have all of the races concentrated within the one region like the Scenic Rim," he said.
"We've had a lot of great feedback and a lot of interest.
"It is going to be a jam-packed year."
Sunday's race is the first of four for the year in the MTB series, with a six hour event scheduled for May 19, a 24-hour epic planned for June 15 and 16, and the popular 12-hour dusk til dawn to be held on October 26 and 27.
A total of 500 athletes are expected to enter the series across the four events.
Registration can be completed on the day until midday or online prior to the event via ontheedgeevents.com.au
On The Edge Events also presents the Scenic Rim Gravity Enduro Series with two events in March and July, and the Kooralbyn Trail Running Series, which features four races and gets underway in April.
This year, the adventure sports company is also hosting the first ever Scenic Rim Ultra-marathon on October 5 over distances of 105 kilometres and 65 kilometres.
For more information, contact Andrew Bonney on 0417 740 535.