"It was a really tough course. It was a long way to the top and big descent, but it's a really well built course and I enjoyed it.''
Cooper, who will ride fulltime on the UCI world cup for the Cannondale Factory Team this year, was relaxed about the defeat.
"That's the way racing is. I'm not too worried as this is part of the build up for me for the rest of the season.''
Peters won the five-lap elite men's race in convincing style with a time of 1:47:16. The 21-year-old made the most of favourable conditions to get an early lead on his opponents, including fellow Rotorua rider Carl Jones who took second in 1:50:36.
The elite women's race saw Kate Fluker (Queenstown) well ahead of the pack, finishing in a time of 1:40:49, almost nine minutes ahead of second place Erin Greene (Dunedin).
Mary Gray (Dunedin), a top-10 finisher in the world championships last year, took out the women's under-23 honours in 1:21:14.