Newly revealed course information shows it will be inner Wollongong suburbs which bear the brunt of road closures over the six days of racing and two of training.

Race organisers are asking residents to plan ahead and "consider that week differently" as "Wollongong's Olympic moment" featuring more than 1000 riders from more than 40 countries.

Both the Helensburgh to Wollongong route, and the Mt Keira-Kembla loop, will only be used once on each of two days, meaning roads will be able to re-open once the race has well and truly passed.

Read more: Sea Cliff Bridge 'our Champs Elysees moment', says Tour de France stage winner

The men's and women's Elite Road Races will start at Helensburgh, cross the Sea Cliff Bridge, race down Lawrence Hargrave Drive to Bulli, follow Pioneer Dr to North Wollongong, then head up Mt Keira Rd, loop around to Mt Kembla, head west along Five Islands Rd then northeast on Springhill Rd.

Before the finish there will be 12 (men) or six (women) laps of the Wollongong City Circuit before finishing at Wollongong's City Beach.

The women's Elite Road Race will be held from 11.55am on Saturday, September 24 while the men's will be the following day from 10am.

Road closures will be longer and ongoing for residents in more central parts of Wollongong, such as Gwynneville, Mt Ousley, North Wollongong and the CBD.

The Wollongong City circuits are similar for the road races and time trials for men, women and juniors, with Squires Way and cliff Rd featuring heavily, as well as Corrimal St, Campbell St, Gipps Rd, Murphys Ave, Dumphries Ave and Cabbage Tree Ln.

These areas and roads will cop the brunt of the closures between Sunday, September 18 to Sunday, September 25. With races involving up to 10 laps of the city circuit, roads are likely to be closed from the early morning until late afternoon on each of these days.

Wollongong 2022 CEO Stu Taggart encouraged residents to plan alternative transport and "consider that week differently" for what he called "Wollongong's Olympic moment".

"The confirmation of the race details will provide some comfort for residents and businesses from Helensburgh to the city, and around Mount Keira and Mount Kembla," he said.

"That means those roads will reopen once the athletes and support vehicles have passed through and the traffic management team certify it is safe to do so.

"There's no doubt that we'll all have to do things a little differently to make the most of this unique opportunity for the city.

"Wherever possible, we encourage people to consider that week differently - why not try active transport alternatives, reschedule activities, plan ahead or adjust your schedule for the week to reduce the impact of road closures and allow you to soak up the energy and excitement of this world event being in town."

To watch the races, some of the best vantage points are likely to be the Sea Cliff Bridge, Bulli Beach Reserve, Cliff Rd and Flagstaff Hill, Dalton Park at Towradgi, Mt Keira Rd for the climb, and of course the finish line at City Beach/Lang Park.

Saturday, September 17 and Thursday, September 22 are training days with activity confined to the city route and the morning, so passage is likely to be easier for residents on those afternoons.

Residents and businesses will be informed about preparatory works and event times through letters and emails, updates to the Wollongong 2022 and Council websites and local media.

More details will be at the first Wollongong 2022 information stand at Pedal in the Park on April 10 at Lang Park.

To read more stories, download the Illawarra Mercury news app in the Apple Store or Google Play.

Sign up for breaking news emails below: