Plapp wins third-straight Australian road cycling title

They broke away for more than 100km of the 185.6km road race at Buninyong, near Ballarat, and coasted across the finish line in triumph.

Harper let his teammate take the win as Jayco AlUla completed their domination of the elite races at the road nationals.

It is a dream start for Plapp at Jayco AlUla after he transferred from British team Ineos Grenadiers.

Kelland O'Brien won the three-rider sprint for the bronze medal to complete the Jayco AlUla trifecta in the men's road race.

Earlier on Sunday, Ruby Roseman-Gannon won her first national road race title after also winning the criterium on Friday for the second time.

Caleb Ewan won the men's criterium and Plapp also took out the time trial, meaning women's time trial winner Grace Brown was the only non-Jayco AlUla winner among the six elite road events over the last four days.

Roseman-Gannon made clear her Paris Olympics dream after the landmark win.

The Victorian 25-year-old beat four previous winners to take out the elite women's road title.

Once Sunday's contest ignited at halfway, Roseman-Gannon was in every key move and scored the biggest win of her emerging career.

The pulsating race came down to a select 11-rider front group featuring all the big names, including defending champion Brodie Chapman, previous winners Amanda Spratt, Nicole Frain and Sarah Gigante, and three-time time trial champion Grace Brown.

"It's super-special. It means a lot more when everyone is there," Roseman-Gannon said.

Roseman-Gannon was in shock after winning the bunch sprint as she consigned last year's run of near-misses - she called it "the curse of fourths" - to history.

She knows it is way too early to think too much about Paris - her mission now is to perform well at the cobbled classics in the European spring.

"I think about Paris a lot, but one step at a time," she said.

"The course and the way Paris will be ridden is a completely different race (to the nationals), with the narrow streets and cobbles.

"So I'd say putting up my hand in the cobbled classics would probably be the best way to say that."

Roseman-Gannon capitalised on superb teamwork by Jayco Alula, as Alex Manly finished third behind Lidl-Trek's Lauretta Hanson.

"We had a team meeting and everyone was 100 per cent in ... we really wanted this, we had tears in the meeting about how much it meant to us," Roseman-Gannon said.

More broadly, it has also been an emotionally wrenching week for the sport after the death last week of Melissa Hoskins, who once rode for a predecessor of the Jayco Alula team.

A minute's silence honoured Hoskins before the start of the women's road race on Sunday morning and riders wore black armbands.

"Of course, the last week as well - I never really knew Mel, but a lot of people are struggling with that," Roseman-Gannon said.

This is the last time Buninyong and Ballarat will host the nationals after a two-decade run, with the new location yet to be announced.

Unusually for Buninyong, it was a wet race on Sunday, but there were no crashes among the leading riders.

Australian Associated Press