There were only 26 riders on the start line when Taupo's Bruce Jaine took part in the inaugural Lake Taupo Cycle Challenge in 1977.
This year, about 7000 people have entered the event being held tomorrow.
Jaine said he could not remember too much from the first race around Lake Taupo, 38 years ago, but certainly did not imagine the event would grow so big.
He said he entered that first event after making a spur of the moment decision and it was rather casual.
"I think I had one too many beers one night and said I'd do it.