It features six races, which include traversing 50-kilometre, 25km, 12km or 1km courses, as well as ebiking, where cyclists may be assisted by motors.
Cornwall said he expected some soft patches but the tracks were likely to be mostly firm.
“The riders should whack out some good times.”
All of the school’s six pupils will be there.
Motu is between Gisborne and Opotiki and the rugged terrain is ideal for outdoor pursuits.
The event has been running since 2015 and raises money for Motu Community House, which provides accommodation near the southern end of the Motu Trails.
Riders will start and finish at Motu Community House.
Three-time winner of the 50km race Callum Gordon, from Gisborne, said access to farmland made the event special.
The course featured a daunting climb, steep descents and grassy tracks, he said.
“It’s pretty cool, pretty rugged.
“You can walk it or ride it.
“It’s a good challenge, with really good views.”
Margeaux Pittar, the 50km women’s winner last year, is unable to make it this year but said she enjoyed the atmosphere of the event.
“Everyone is out for the challenge of the long climb and steep descent but everyone loves it,” she said.
“The climb is worth it for the views of the surrounding Motu valley, and traversing across the farmland terrain provides a challenge in itself.”
The 50km race consists of two laps of the 25km course.
“The second lap was great once I had reached the top, knowing all I had left was the cruise down to the finish,” Pittar said.
Riders can register on the day, from 8.30am, and they are tracked with electronic timing.
The first race starts at 10am.
The weather is forecast to be fine or partly cloudy.
Eastland Community Trust, PGG Wrightson and Ballance are the event’s main sponsors.
