This is Mrs James' first visit to this country and she said she is glad she came.
"I absolutely adore New Zealand but I don't think I'll be doing it again on a bike.
"It would be okay if we were just tootling along taking in the scenery, but everybody's so competitive."
Meanwhile, her husband Tim has established a commanding lead in the men's section.
He had a 16-minute lead on the second-placed male rider and would have extended that by a few minutes in yesterday's leg.
"It's [the lead] comfortable but I'm not counting my chickens just yet."
This is the first time the James have done the Tour. '
'We heard about it when the organisers put together a really nice DVD and having seen that we thought 'Yep, we've got to do that'," he said.
And he said they are loving the event and experience.
"Every day's been different and in fact the route has been fantastic in its own different way. The scenery has been amazing."
He admits to be being more serious in cycling terms than his wife, while she just calls him "bonkers".
"I do about 350km a week and Helen probably rides twice a week. That's how much to measure the madness. I do more on my bike than do in my car."
The last leg today is a 74km run from Pahiatua to Masterton for the North Island race while the southern tour covers 68km from Blenheim to Picton.
Tomorrow the best team from each island, along with the top male and female riders, will face off in a 10-lap criterium around the Parliament buildings.