From the Camden Cycle Club website:

Get ready CycloCross is coming to Camden on the 30th of July for our first King and Queen of the Valley race at Camden Bicentennial Equestrian Park.

C & D Grade: Any bike is welcome, though we recommend an MTB, cyclocross or gravel bike.

B Grade: Any bike is welcome, however, MTBs or flat bar bikes will be started in a separate wave. CX or Gravel bikes are recommended, with 35mm tyres preferred in the spirit of CX, but wider tyres will be accepted.

A Grade must be CX or Gravel Bikes with a 35mm maximum for tyres strictly enforced.

Acknowledgement: This race will take place on the traditional lands of the Gweagal, Bidjigal and Gadigal people. CX Down Under acknowledges the Traditional Owners of the land on which we ride, and their continuing connection to land, waters and culture. We pay our respects to elders past, present and emerging.