The first of the 5CV series was the Type 172 BC, itself a new model, though similar to the Quadrilette, which was still sold through 1924.

The Type 172 BC carried over the 667 cc engine from the Quadrilette, but with power up to 11 hp (8.1 kW).

The engine was a 720 cc inline-four and produced the same power rating as before, but torque was quoted appreciably higher.

In 1928, the engine was replaced with a smaller 695 cc powerplant that nevertheless produced more power, at 14 hp (10 kW).

The smaller engine lowered the rating of the new Type 172 M tax classification to 4CV, and the track was widened.