The Belgica followed the 175 Legia, designed by Marcel Doflein. Components are from mainly German suppliers - Bing carburettors, VDB wheel hubs, Ferodo brakes, Hella & Bosch electrics.
According to a restorer, there are three different models of Belgica; the standard model has the mudguard with integrated flap and the slightly square side boxes; the semi-faired version has toolboxes with rounded shapesl and the faired model has the carburettor concealed behind an aluminum casing.
They go on to say that many parts fitted to the Belgica are the same as on the previous Legia and Milan models:
Saroléa Montana 200cc 1955 - some parts seemed to be similar between the Belgica 200cc - the front and rear hubs are almost identical as well as the rear light, the carburettor and the fork.
Source: https://www.geocities.ws/gilletherstalbelgica/BELGICA.html //////// Gillet-Herstal Belgica & Legia 1953-1959 In 1953 the Legia is released, a new 175cc whose design can be said to break with the habits of the Gillet workshops. It is a realization of Marcel Doflein, who took over the helm of the technical management after the illness of Armand Laguesse. The new egg-shaped block is quite different from the ones made so far where the crankcase roughly followed the internal parts of the block. There are no visible bulges other than the cylinder. Two-stroke, because the brand now has thirty years of experience with this type of power source. The engine block is also the most original part of the machine, which is mainly built from carefully selected components from mainly German suppliers such as Bing carburettors, VDB wheel hubs, Ferodo brakes, Hella & Bosch lighting, ... Together with the Milan / SuperConfort, the Belgica (and Legia) is one of the last 'real' Gillets.
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