A Brief History of the Marque
A company in Pessano con Bornago, Milan, specializing in the production of motocross and enduro machines including the 50cc Minicross in three versions, Junior, Senior and Professional, and RX/MX80 for cross and enduro.
MX80 Professional Honda 79.3cc two-stroke 24.8 HP @ 13,00 rpm, 82kg, 6 speed.
RX80 Minarelli 79.6cc 22.5 HP @ 12,500 rpm, 86kg, 6 speed.
In the address of Tresoldi srl for 2016 is listed as:
Strada Provinciale, 64, 20060 Pessano con Bornago MI, Italy
Apparently there is a small museum with a history of the marque.
Sources: MC Storico Conti et al