In the other meeting of the Diamond League final round, the Van Damme Memorial in Brussels on 5 September, Valerie Adams will wrap up her fourth consecutive Diamond League shot put title. The four times world champion will then also head for Marrakech to defend her Continental Cup title.
None of New Zealand's five riders in the endurance event completed the 160km journey, held in atrocious conditions.
Georgia Smith and Glenmore Vixen of Mangaweka were vetted out after the first loop, followed by Otago's Susie Latta on Tkiwa and Braden Cameron of Wellington on Karamea Krusader at the end of the second.
Smith's mother Andrea on Glenmore Tariq looked to be going well until a stumble and fall left her with three broken ribs.
Nelson's Alison Higgins and Northwinds Apollo rode a brave race, but the clock was against them and they were forced to stop at the end of the fourth loop after more than 10 hours on the course.
The event at Sartilly was won by Sheikh Hamdan bin Mahomad Al Maktoum aboard Yamamah of the United Arab Emirates, in 8h 8min 28s, followed by Dutch rider Marijke Visser and Laiza de Jalima in 8:19.07. Spain won the team gold, heading home France and Switzerland - the only three countries with three riders left in the ride.
Just 38 of the more than 170 riders completed the event.