The transition in competition from elaborate series production motorbikes to those specially designed for racing use took place gradually in the two decades between World Wars.
The birth and evolution of the large competition models are linked to the sales-driving function of some famous races and the consequent importance given by motorbike manufacturers to this form of promotion.
The types of competitions of these years were essentially based on three basic types: races on high-speed circuits; races on mixed circuits with particularly difficult tracks; and long-distance road races.
In Italy, if Monza is the classic example of races of the first type, and the Milano-Napoli (later Milano-Taranto) and the Giro d'Italia are for road races, the Circuito del Lario - called the Italian Tourist Trophy because of its difficulty - was undoubtedly the most difficult closed-circuit race in Italian motorcycling for twenty years.
The difficulties of the track (a 36.5-kilometre ring to be repeated six or seven times with three hundred curves per lap and a 550-metre difference in altitude between the part along the lake and Ghisallo Pass), the beauty of the places and the date of implementation have made it not only the most important Italian motorbike race, but also an unmissable appointment of the sporting summer.
The most prestigious motorbikes and the best-known champions of the time have passed through Lario, hence the choice of the history of the Lario Circuit as the basic plot for a wide-ranging discourse on the development of motorbike technology between the two wars.
A subject that, complete with biographies of the most famous champions of the time, unfolds through a series of technical notes and a collection of monographs of the motorbikes that marked the most important steps in the development of motorbike technology.
Le moto da corsa al Circuito del Lario 1921-1939, published in 1991, has 367 pages and a rich iconographic collection that completes Sandro Colombo's excellent text.
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