They've shown they have the speed. Now they will show if they go the distance.
The trio have all made their careers in Olympic distance events, which consist of a 1.5km swim, 40km cycle leg and 10km run.
Olympic-distance triathletes usually make a smooth transition to long course, which on Sunday is a 1.9km swim, 90km cycle and 21.1km run.
But Geelong will feature a strong field of established long-course triathletes and Moffatt knows she is in for a tough initiation.
"I have no idea what prompted me to enter - I guess it's something I've never done before so it's a great challenge and a good way to prepare for my upcoming World Championship Series races," Moffatt said.
"The furthest I've done in a race is Olympic distance and I still enjoy the ITU races so, in the near future, they will be my focus.
"Maybe in years to come, I will do more longer racing.
"It is going to be an interesting day - I'm actually really excited to race. Doing something new is refreshing but, come race day, I'm not sure I will be overly excited."
The woman to beat will be Melissa Hauschildt, who has won the world title at this distance, with Australian Ironman champion Michelle Gailey also in the field.
Moffatt and Kahlefeldt raced at the London Olympics, while Robertson's glittering career featured three Olympic-distance world titles and selection for the Sydney and Athens Games.
The Urban Long Course race is part of a packed triathlon program for the weekend's Geelong Multi Sport Festival.
Sunday's program will also feature the ITU Oceania Cup, which doubles as the Australian sprint-distance triathlon championships.