A Brief History of the Marque
Manufactured in Saint-Etienne 1925 to c1929
Stéphanoise Massardier founded the parent company in 1910, building components including gearboxes which were supplied to Amilcar, De Dion-Bouton and Peugeot. They also produced Massardier engines.
The Royal Moto company was established in 1925, and released the first motorcycles that year.
Models included two-strokes of 100cc, 175cc and 250cc, along with 250cc and 500cc four-strokes both SV and OHV. Engines were all by Massardier.
1926 175cc Belt Drive
1926/27 Type P, 175cc, 1 or 2 speeds
1928 Types 175 CC, 175 BM, 250T
1928 350GT four-stroke
Type STL 250cc
Motorcycle production appears to have ceased in 1929.
In competition the results were good, with a 4th in the 1926 Bol d'Or 175 class, and a win in the 1929 Bol d'Or.
Engines Types include:
Massardier 125cc and Massardier 175cc
These were used by other firms from 1923 on, including Ravat and it's sister brand Wonder.
Sources: royal-moto.webnode.com, Cycle Memory, Tragatsch p265, wikipedia.fr et al