"The aim really is to create an event that's unique and uses the existing velodrome track as the berms," said Trott.
It was like a native Wanganui version of BMX, using the velodrome gradient in four areas to create the speed, he said.
Basic off-road and BMX bikes will be used and the club will have some available for those who are without.
Club president Stu Bruce said like most sports, they were trying to find something that took the popular elements of their traditional events but was compacted to appeal to the mainstream as well as enthusiasts.
Velocross was enjoyable for technical cyclists, off-roaders and even first-timers keen to try out something new, without putting too much demand on their time, he said.
"It's about being relevant to lots of people to enjoy a few endorphins running in your body.
"We're bringing it out about now because we think there will be a few kids keen to have a go."
BMX specialists also get to experience competing at the velodrome.
There will be age categories on the day, as well as a barbeque, for a gold coin entry.
Practice starts at 2pm tomorrow, with racing at 3pm.