Classes are split by engine capacity for any Two Wheel Drive (2WD) vehicle, whether Front Wheel Drive (FWD) or Rear Wheel Drive (RWD). Four Wheel Drive (4WD) vehicles have a separate class as they have a traction advantage with all four wheels putting down the power.

Vehicles may be registered, or unregistered. See the How to Start page for some conditions.

Ipswich also runs a separate ladies' class designed for the not too serious femmes, and there are two dedicted Junior classes for the young to have some fun in a controlled environment.