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 Moto Guzzi - 500 Sport Tre
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Photo ou archives : archives FMD

Capacity : 500
Model : Sport Tre
Production : 1932 - 1933
Category : (R) Street Bike


500 Tre Sport -1933

Sixty years ahead of its time!

Few marques - if any - can boast of a history as rich as that of Moto Guzzi. The great Italian company, famed for its horizontal singles, has tried just about every possible engine configuration, from twins V or parallel - to a fabulous V8.

From Four into Three

One of the most interesting developments - which sadly proved to be a dead-end - began in 1930 with a supercharged racing bike endowed with a remarkably compact transverse horizontal four-cylinder power unit. This extraordinary engine, the first Guzzi multi-cylinder, achieved 45 hp at 7800 rpm and 110 mph but never passed the prototype stage. However, two years later, its technology gave birth to a three-cylinder roadster whose concept still seems modern.

An Ideal Layout

Though the three-cylinder engine is rarely used, principally on account of the cost of making the crankshaft, it is nevertheless ideally configured for the motorcycle. Its 120- degree firing interval gives it nearly perfect balance and - lighter and more compact than a four - it is better suited to transverse installation. The Guzzi went still further since - like modern engines - its width was little more than that of its cylinders. Of rare elegance, the "Tre" ("Three") was also innovative because of its bolted-up, two- piece frame, derived from that of the four and fitted with a remarkable swing arm rear suspension designed in 1928 by Carlo Guzzi himself.


Engine: 495cc (56x67mm) air-cooled horizontal three-cylinder four-stroke

Power Rating: 25 hp @ 5500 rpm

Valves: parallel overhead

Fuel System: Amal carburetor

Transmission: 3-speed hand-shift; multi-disc oil-bath clutch; chain final drive

Suspension: girder forks (front); swing arm with two horizontal springs beneath the engine and twin friction dampers (rear)

Brakes: drum (front & rear)

Wheels: 19 inch wire (front & rear)

Weight: 353 lb

Maximum Speed: 81 mph


Too far ahead of its time, the Guzzi Tre never passed the pre-production prototype stage and today the sole survivor is preserved in Moto Guzzi museum.


Le fichier Moto Passion réalisé par François-Marie Dumas réunit près de deux mille photos accompagnées d'un historique très complet des machines présentées.
Il sera progressivement mis à jour ici et toute information complémentaire est la bienvenue sur info@moto-collection.org.

Cette documentation unique, qui constitue sans doute l'encyclopédie la plus exhaustive jamais écrite sur l'histoire de la moto, a été réalisée avec l'assistance de nombreux spécialistes dont principalement Didier Ganneau, Christophe Gaime, Mick Woollett, Jean Goyard, Bernard Salvat, Christian Rey, Yves Campion, Helmut Krackowizer, Michael Dregni, Michel Montange, etc. que je remercie ici.

Disponible sur demande :
- Les fiches originales sur papier
- Les photos et archives signées de mon nom en haute définition ou les documents originaux.
Me contacter sur info@moto-collection.org pour les conditions et droits d'utilisation.