TT racing is like superbike racing on soil instead of tarmac - the racing is off-road and the competitors use dirt bikes or quad bikes, but, unlike motocross, there are no steep hills or skyward launch ramps to slow things down at the Bike Torque Yamaha-sponsored event.
Groombridge rode his Suzuki RM-Z450 to win the MX1 class and raced his Suzuki RM-Z250 to success in the MX2 class at the weekend, but (riding a "vintage" 2008-model RM250 two-stroke) had to accept runner-up spot in the Enduro bike class, narrowly beaten by Eketahuna's Charlie Richardson (KTM).
"I had a big get-off in the first enduro class race, on the fastest part of the circuit, too," he said.
"There was a sharp right-hand kink and I hit it too fast and the back end just let go and high-sided me off the bike. Luckily, there was no major damage, just a few bumps and bruises.
"The rain made it tricky, especially for visibility. I needed to be at the front right from the start. I managed to get good starts on the 450cc bike, but had to battle through traffic on the 250cc bike. I had some quite creative lines, so that helped me to get to the front," said Groombridge.
Other title winners during the weekend were Christchurch's Ian Fitch (premier ATV), Napier's Wade Taylor (ATV over-40 years), Kaiwaka's Cullen Curtis (450cc production ATV and 12-16 years junior ATV), Taupiri's Mark Fuller (enduro over-50 years), Mangakino's Alex Dillon (women), New Plymouth's Mitch Rowe (classic bikes and veterans over 45 years), Turangi's Xavier Dalziel (125cc class), Taupo's Daniel Scrimgeour (veterans over-35 years), Mangakino's Maximus Purvis (12-16 years 125cc and 14-16 years 250cc), Opunake's Zak Hetherington 13-16 years 85/150cc) and Eketahuna's Wade Bengston (8-12 years 85/150cc).