This weekend, if you're heading to Busselton, you may notice more bikes than usual riding the roads.
Even at 3am, there will be people on bikes.
These guys are taking part in the Delirium 24 Hour Bike Race.
Race organiser, Rebecca Cotton, says these competitors are a different breed.
"These guys are just passionate endurance cyclists," Cotton told Triple M's Out of Bounds. "They are super strong, super fast and a little bit bonkers. But we love them all. They're all part of our Delirium family".
Last year, in the seventh running of the event, Lee Scurlock managed to clock up 894.9km over the space of 24 hours.
Scurlock will be aiming to crack 900km this time around.
There's also a chance that we'll see the first team reach 1000km, with the Avanti Plus "UberQuads" taking to the streets again. In 2017, they got to 949.4km.
The event takes over parts of the foreshore of Busselton - Marine Terrace, Ford Road, Geographe Bay Road and along the eastern end of Barnard Park.
It will start at 11am on Saturday and run for (surprise, surprise) 24 hours.
Hear the full interview with event organiser Rebecca Cotton here