Williams, who owns the R&R sports shop in Queenstown, headed the elite division in 1hr 41min 52sec.
"It was a great day for the race. The track was fine all the way through, but a bit dusty at places. A few spots were not clearly marked, so some riders missed a couple of turnoffs. I'm very happy with my time," Williams said.
A total of 835 people had entered the race, split into elite, sport and recreational divisions in five age groups.
The route was a scenic off-road track of 45km for elite and sport and 36km for the recreational division.
It ran mostly on Wakatipu Trails Trust tracks, with short stretches along public roads, followed by a long trail on private land along a bank of the Kawarau River.
Starting on a grass paddock between Millbrook Resort and Arrowtown, the groups were led along Millbrook then continued towards Speargrass Flat Rd.
Heading up over Slopehill Rd, the elite and sport divisions took a different route around Lake Hayes before they rejoined the recreational bikers towards the restored old Shotover bridge.
After the wide gravel roads of the Shotover River delta, the riders went up past the Remarkables Park subdivision, over the Kawarau bridge.
A kilometre along the highway took them to the farmland at Boyd Rd before the Remarkables skifield road, where a track led them towards the Kawarau River, which they followed all the way to the Chard Farm Winery.
