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 BAT - 770 5/6 hp
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Photo ou archives : F-M. Dumas

Capacity : 770
Model : 5/6 hp
Production : 1913 -
Category : (R) Street Bike


770cc Light Roadster / Model 1 – 1913

"Best After Test"

"Best After Test": The BAT marque, founded in 1902, could not have found a better slogan to promote its products, but the origins of the name were rather more prosaic. It was just an abbreviation of the name of S. R. Batson, the firm's creator.

No Need to Pedal

Still, BAT had a fine sense of publicity. It boasted that it had been the first company in England to have a vertical single-cylinder engine mounted in the bottom-bracket position. It was patented in France by the Werner brothers in 1901, the first not to need pedals - even on the steepest hills - and the first to offer suspension at both ends.

Full Suspension

In fact, the 1903 BAT was suspended at the front end by a fairly efficient leading-link spring fork (a primitive ancestor of the Earles fork), while the rear of the frame was rigid. The term "fully suspended" was only justified because the saddle and foot boards were carried on a complex sprung sub-frame linked to the main frame. BAT enjoyed great success in racing, initially with De Dion engines, then with JAP power units, including a very special single-cylinder unit with overhead-valves and water-cooling. Despite its brilliant debut, BAT had fallen behind the times by 1913, with direct belt transmission, and on the Models 1 and 2, an obsolete gear-shift in the rear hub. On the other hand, the Model 3 had a separate three-speed gearbox. BAT, which suspended production during WWI, resumed in 1919 and took over Martinsyde before closing down in 1927.


Engine: 770cc (76x85mm) air-cooled JAP 50-degree V-twin four-stroke

Valves: side

Fuel System: carburettor

Transmission: Armstrong two-speed hub gear, V-belt final drive

Suspension: leading-link (front); sprung saddle/foot board assembly (rear)

Brakes: band brake (rear)

Wheels: 26x2.50 inch clincher (front & rear)

Weight: 220 lb

This BAT Modell of 1913, with its wickerwork sidecar, features an ingenious sprung sub-frame carrying saddle and foot boards.

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.