The Lancia 15/20HP (Type 54, Beta) replaced the earlier Alfa-12HP and Dialfa-18HP models. Basically the car was modernized version of 12 HP, engine displacement was enlarged from 2.5 to 3.1 litres (from 28 hp to 34 hp) and wheelbase increased from 282 cm (111.0 in) to 293.2 cm (115.4 in).
The 15/20HP was manufactured 150 examples and it was replaced with Gamma-20HP model (type 55) in 1910.