Photo ou archives : D. Ganneau
5112
GD
175 CM - 1929
A missed opportunity
Founding members Gherardo Ghirardi and Guido Dall 'Oglio left GD in 1925 to found a new marque, Dall'Oglio. After only building little two-stroke singles, it closed in 1928. GD's remaining founder-manager, Mario Ghirardi, was gradually losing his influence. For his future models, Ghirardi had to rely on designs produced at CM by Alfonso Drusiani and Mario Cavedagni. While Cavedagni had left GD at the end of 1925, he remained on good terms with his old boss.
New Regulations
Consequently, the 175 that GD launched in 1929 was a complete break from the previous productions of the marque, but was suited to the new Italian vehicle-licensing regulations established in 1928. These gave a great stimulus to the national motorcycle industry, for they raised the limit for lightweight bikes, which could be ridden without a license or road tax, from 125 to 175cc. Pedals were not required, there was no weight limit and the minimum age for riders was cut to 18.
Lack of Preparation
The GD 175 CM was a vertical single-cylinder two-stroke with siamesed intake ports and twin exhaust pipe. Three were entered in the International Six Days' Trial in 1929, but their lack of preparation did nothing for the marque's reputation or the model's commercial chances. Besides, the clients preferred the rival four-stroke models. Despite the arrival of designer Ubaldo Fangarezzi at GD in 1929, the company abandoned motorcycle production in 1931 and closed down in 1934.
SPECIFICATIONS
Engine: 172cc (58x65mm) air-cooled single-cylinder; magneto ignition
Valves: two-stroke; ports controlled by piston skirt
Fuel System: carburetor
Transmission: 3-speed, chain final drive
Suspension: girder forks (front); rigid (rear)
Brakes: drum (front & rear)
Wheels: 3.00x25 inch (front & rear)
Weight: 220 lb
Maximum Speed: 50 mph
No longer capable of developing its own models, GD was compelled to rely on CM to design its new 175. It was the beginning of the end for a once great marque.