Motore ausiliario per bicicletta realizzato dalle Officine Meccaniche Rapid con sede a Milano in via Brioschi, cilindrata 48 cc trasmissione a rullo di aderenza e dotato, era uno dei pochi, di frizione a dischi multipli in bagno d'olio.
Realizzato in diverse serie con continui miglioramenti tali da consentire aumenti di potenza da 1,1 a 1,2 e poi fino a 1,6 CV.
Gli ultimi esemplari avevano cambio a due velocita'.
Auxiliary engine for bicycles made by Officine Meccaniche Rapid headquartered at Via Brioschi. The 48cc engine with friction roller drive was equipped, unusually for the time, with a multi-plate clutch in an oil bath.
Several models were built with progressive improvements including power increase from 1.1 hp to 1.2 and then to 1.6 hp.
The last models had a two-speed gearbox.
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