"We have to go along the Whanganui River Rd [for the stage]," Collin said.
"His advice was, we should not personally drive it, and we will not."
The ride had a delayed start at 10am to head to Pipiriki, and then the cyclists were planning to travel by vehicles through Waiouru to stay the night in Palmerston North, resuming their regular schedule today.
"Even the bit we've got is pretty dynamic [weather]...and I reserve the right to stop it," said Collin.
He agreed it was a great shame the tour could not take in the scenic 60km journey towards Whanganui.
"It's one of the great sections of cycling in the North Island, I think. I've done the tour four times."
The tour will finish in Wellington on Saturday, where the North Island and South Island races converge, and so far has raised $325,000 for charity.