Orange Cycle Club member Alan Giumelli has put his hand up to be a 'wave rider' in the Bicycle Network's Newcrest Orange Challenge's 170 kilometre event.

Mr Giumelli said the role means keeping an eight hour pace with about an hour of breaks in between.

In addition to being a keen mountain bike rider, Mr Giumelli said he's a pretty regular recreational rider with the club and has amped up his training ahead of the event.

"You can't just get up and do it - you've got to build up for it," he said.

Mr Giumelli said the appeal of the Newcrest Challenge is riding on the quieter backroads and getting to see a bit of the Central West.

"It's also quite challenging," he said. "It's a good distance and quite a bit of climbing."

The weekend's Newcrest Orange Challenge cycling event will require road closures in the CBD and areas west and south of the city to ensure the safety of competitors.

​A time trial event around Robertson Park on Saturday afternoon will mean no access for cars to McNamara Street and Lords Place from 1pm on Saturday and through Sunday, while Byng Street between Peisley and Summer streets will be closed between 4pm and 7pm on Saturday.

Sunday's race will force early-morning closures of McNamara, Moulder and Kenna streets, as well as Coronation Drive and Cargo Road.

There will also be changed traffic conditions - including speed reductions and traffic controllers - at Forest Reefs, Orchard and the Southern Feeder roads, and Anson and Moulder streets between 11am and 4pm on Sunday.