It started as a "boys' weekend" in 2009, but has grown into a major fundraiser.
The Tranz Alpine Scooter Safari is the brainchild of Canterbury couple Mike and Jayne Rattray, who have raised more than $600,000 from four events.
The biannual event sees 250 sponsored participants ride motorised scooters 250km between Christchurch and Hokitika in a day.
Mr Rattray, an engineer at Air New Zealand, did the trip in 2009 for fun with a group of friends who had bought scooters off Trade Me. That week one was diagnosed with bowel cancer.
"We thought, why not turn it into a bit of a fundraiser? And the idea snowballed from there," Mrs Rattray says.