The Rolls-Royce 20/25 was built between 1929 and 1936 and succeeded the 20hp as Rolls-Royce's "small car".

It was intended to appeal to owner drivers, but many were sold to customers with chauffeurs.

The in-line 6-cylinder overhead valve engine was similar to that used in the 20hp but was enlarged to 3699cc by increasing the bore from 76mm to 82mm with the stroke remaining at 114mm.

A single Rolls-Royce carburettor was used and both coil and magneto ignitions were fitted.

The four-speed gearbox was mounted in unit with the engine and a traditional right hand change used.

Synchromesh was fitted to third and top gears from 1932.

The substantial chassis had rigid front and rear axles suspended by half elliptic springs with braking on all four wheels assisted by a mechanical servo.

Separate rear brakes were fitted for the handbrake.

The famous Rolls-Royce radiator with triangular top was used with vertical louvres, the angle of which could be adjusted to control engine cooling.

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