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 MM - 175 SB 32
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MM SB 32 motocyclette motorrad motorcycle vintage classic classique scooter roller moto scooter
Photo ou archives : D. Ganneau

Capacity : 175
Model : SB 32
Production : 1932 -
Category : (R) Racing


175cc SB32 -1932

High-speed lightweight

For a long time, the 175 category was one of the most fiercely contested. This competition produced - particularly in Italy - a number of superb little four-strokes. MM made its debut in this category in 1929, but the overhead-valve engine they were using at the time was already outclassed. For 1931, MM decided to bite the bullet and developed an overhead-camshaft unit, which did not really come into its own until the following season.

Glory Years

For the ohc MM, the glory years really began in 1933, when Bonazzi took the World Flying Kilometer record at 100.38 mph, despite determined opposition from the German Winkler on a DKW. The same year, the great Dorino Serafini became Italian champion, while the French MM rider Barthe won the Grand Prix of France at Montlhery, a feat

repeated on the same circuit in 1935 by the Frenchman Terigi and in 1937 by the English rider Dickwell. And Schouppe became Champion of Belgium in 1936 with his 175 MM.

End of the Road for the 175

Remarkably, a similar 175 MM, ridden by Fouilhoux, finished second in its category in

the Bol d'Or in 1948, long after the MM's racing days were over in its homeland. In 1935, the Italian Federation had done away with the 175 category, ending a whole generation of machines that were at the same time simple yet highly evolved and aggressive. Among the finest of them all - marques such as Benelli, Ladetto-Blatto, Miller and OMB - was the MM.


Engine: 174cc (58x66rnm) air-cooled singlecylinder four-stroke; dry-sump lubrication

Power Rating: 15 hp@ 8200 rpm

Valves: overhead-camshaft

Fuel System: carburetor

Transmission: 3-speed, chain final drive

Suspension: girder forks (front); rigid (rear)

Brakes: drum (front & rear)

Wheels: wire (front & rear)

Weight: 176 lb

Maximum Speed: 84 mph


With a fine competition record, the MM 175 is a typical Italian sporty lightweight of the early 1930s.

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.