The car followed its Triumph predecessors by having Lockheed hydraulic brakes, but now they were internal expanding in 9.5 in (240 mm) drums and so less affected by water then the older external contracting type.

The three-speed non-synchromesh gearbox was mounted in unit with the engine and transmitted power to the worm gear final drive via a torque tube.

On test the car could reach just over 50 mph (80 km/h) and return 40 miles per imperial gallon (7.1 L/100 km; 33 mpg‑US).

For 1929 a new body style was released called the Special Sports with pointed tail and there was also briefly a supercharged version with the engine capacity reduced to 747 cc and reputedly able to reach 80 mph (130 km/h), but it was expensive at £250, and few seem to have been sold.

Also in 1929 Donald Healey entered a standard car in the Monte Carlo Rally, starting from Berlin but failing to finish, getting stuck repeatedly in the snow in France.

The car's track grew from 42 to 43.5 inches (1105 mm), the rear springs were changed from quarter to semi elliptic on the Mk II Saloons, and the de-luxe models got a four-speed gearbox.