BMW R 51/3 in Movies
Engine
The engine was a Air cooled cooled Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder.. A 68 x 68 mm stroke result in a displacement of just 494 cc / 30.1 cu in.. The engine features a 6.3:1 compression ratio.
Chassis
It came with a 3.50 -19" Metzeler front tire and a 3.50 -19" Metzeler rear tire. Stopping was achieved via ∅200mm Drum, duplex full hub in the front and a ∅200mm Drum, simplex full hub in the rear. The front suspension was a Telescopic fork with hydraulic damping, plunger type while the rear was equiped with a Spring with coil compression springs and rubber deflection stops The R 51/3 is fitted with a 17 liters / 4.4 US gal fuel tank.

Le cap de l'espérance
Deux autres photos : Elles ne me disent pas grand' chose, hormis le flat twin. Bon, allez, quoi En 50-51, sont-ce des CMT ou des CEMEC qu'ils chevauchent, les flics de la route ?
Eh bien, d'après http://www.motards-de-la-gendarmerie.info/marques.htm ce sont des BMW R50 ou R51/3.