Auckland's Hamish Dobbyn (MX2 class), Napier's Wade Taylor (ATV veterans), Auckland's Levi Nairn (Junior ATV 12-16 years), Massey's Kyle Chandler (Production 450cc ATV), Whakatane's Darren Capill (Veterans' over-45), Te Kuiti's Mark Fuller (Veterans' over-50), Hawera's Nick Hornby (12-16 years' 125cc/250cc), and Oparau's James Scott (junior 8-12 years' 85cc/150cc) were crowned national TT champions for the first time.
"It was an awesome weekend of racing, with some mixed track conditions and there was some heavy rain at time," said Groombridge "It was great fun riding in the enduro bikes class, which was something a little bit different for me because I was coming up against riders I don't usually face.
"I was stoked to come away with two class wins."
While there was a flurry of fresh winners, there were also a handful of repeat winners at Kuratau.
Christchurch's Dylan Walsh won the senior 125cc title to add to the Junior 13-16 years' TT title he won in 2011, while Otorohanga's Aaron King was another two-time winner, collecting the Junior 13-16 years' 85cc/150cc TT title for a second time after he had previously won the class in 2012.