It was a light car (305 kg), powered by a 1203 cc flat-twin, air-cooled engine designed by Granville Bradshaw (the man who was also responsible for the ABC Motorcycle).

The engine however was difficult to start, loud, inefficiently lubricated, and prone to breakages, particularly the quite long, exposed push rods.

Combined with the vehicle's light weight, the powerplant made the car quite fast for its size, capable of speeds approaching 60 miles per hour (97 km/h), and boasting quite good acceleration.

ABC was originally part of the Harper Bean combine, and was based in Hersham, Surrey and Harper Bean supplied castings, stampings, and forgings utilized on the first ABCs.

In 1925 a more refined version came featuring stronger valve gear, a better system of lubrication, and enclosed pushrods.