While the unruly Chabreet veered to the outside after turning for home, interfering with race favourite Wagner, Ringerdingding coasted through along the inside to score a stylish victory in the 1100 metre dash.
With three trials since the start of the year for two wins and a second, Ringerdingding was well educated for his debut and reaped the rewards.
"His trial form was very strong and he couldn't have gone any better today," said O'Rourke.
"We've always thought a lot of him. He'll go to the Todman (Group II at Randwick on March 10) and we'll see where we go from there."
A $170,000 Inglis Premier purchase from the Three Bridges Thoroughbreds draft for B2B Bloodstock, Ringerdingding was bred by Three Bridges in partnership as they purchased her dam Maybe I through Paul Willetts for $120,000 at the Inglis Broodmare Sale in 2015.
Ringerdingding is the second winner for Group III placed Red Ransom (USA) mare Maybe I, a grand-daughter of dual Group I winner Flitter.
Three Bridges Thoroughbreds will offer the current yearling from Maybe I, a filly by Unencumbered, at the Inglis Premier Yearling Sale as Lot 743 and she is pictured below.