Class A was for cars with an engine capacity of under 2000cc, or two litres. Cars that had competed during the 1985 Australian Touring Car Championship and appeared in the entry list for the race included: Alfa Romeo Alfetta, Ford Escort RS2000, Toyota Corolla, Toyota Sprinter, Triumph Dolomite Sprint and Volvo 360 GLT. Only five cars finally entered, four Toyotas, two of them factory supported, and an Alfa Romeo which did not start.
Class B was for cars between two and three litres of engine capacity. Turbo charged cars acquired a multiplier of 1.3, meaning a 2000cc car with a turbo became a car with 2600cc for the purposes of the class structure. This saw the factory supported turbo charged Mitsubishi Starions and Volvo 240s compete against non-turbo Audi 5+5, Toyota Celica Supra and the factory backed Alfa Romeo GTV6. While the venerable Ford Capri and a factory supported BMW 323i had made appearances in the championship, none fronted for the race.
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