Downs has been principal naming rights sponsor since 2014 and has signed up for two more years.
Co-owner Sandra Gunn said they were passionate about supporting the district and community.
"The event has a real sense of good old-fashioned fun about it - and it's fantastic to see the young people challenging themselves and, at the same time, having so much fun!"
Sport Whanganui's regions sport adviser Marie Kinloch said they were grateful to Sandra and Robert Gunn for their invaluable support.
"It goes without saying that we're also very appreciative of the fact that schools, children, families and the wider Rangitikei community are continuing to get behind the event."