Guiller - G 90 S
 Back to brands list

Guiller D2-492-34-15
Photo ou archives : F-M. Dumas

Capacity : 175
Model : G 90 S
Production : 1952 -
Category : (R) Street Bike


175 Sport G 90 S - 1952

A quality lightweight

While France's major manufacturers leaned towards the mass production of often very dull machinery, many minor marques were innovators in frame design. That was certainly true of Guiller, active at Fontenay-le-Comte (Vendée), in the west of France, between 1949 and 1956.

Innovative Suspension

Regarded as one of the nation's finest makes, Guiller produced a variety of models from 50cc cyclemotors and scooters built under Italian SIM license to 250cc ohv AMC-engined four-strokes. Also used were Aubier Dunne, Ydral and VAP engines. The 175 Sport of 1952 was innovative for its day with its beautifully made swing arm rear suspension – at a time when plunger (or even rigid) rear ends were commonplace in this size of machine – which ran in heavy roller bearings, replaced on later versions by more conventional bronze bushes. Neither this rear end nor the Grazzini adjustable telescopic front forks had hydraulic damping.

Excellent Engine

To power the Sport, Guiller had chosen one of the finest engine/gearbox units made in France, the all-light-alloy AMC, which, in its sports version, developed 10 hp on a compression ratio of 8:1 against the 8.5 hp at 8500 rpm of the standard version, whose compression ratio was only 7.3:1. Beautifully built and well-equipped, the Guiller offered little more performance than the mass-produced products of Motobécane and Peugeot, but it had far better road manners and a notably livelier engine – and cost 30 percent more.


Engine: 170cc (56x69mm) air-cooled AMC single-cylinder four-stroke

Power Rating: 10 hp @ 6000 rpm

Valves: overhead

Fuel System: 22mm Amac carburetor

Transmission: 4-speed, chain final drive

Suspension: telescopic forks (front); swing arm (rear)

Brakes: 5.1 inch drum (from & rear)

Wheels: 3.00x19 inch wire (front & rear)

Weight: 232 lb

Maximum Speed: 65 mph

Lithe and lively, the AMC-powered Guiller 175 G 90 S had excellent roadholding and was good for 65 mph.

Motorcycle encyclopedia Moto Passion, realised by François-Marie Dumas, include almost 2000 photos presented with an exhaustive history of the motorcycles exhibited.

This unique collection has been realised with the participation of many specialists. With many thanks in particular to Yves Campion, Michael Dregni, Didier Ganneau, Jean Goyard, Helmut Krackowizer, Michel Montange, Christian Rey, Bernard Salvat, Mick Woollett, etc

One can order here

  • Original cards on paper (in french)
  • High resolution scans or original documents presented and signed with my name.

Please contact me at for conditions and copyright.

© Tous droits réservés
François-Marie Dumas

Accueil - Motos NOUGIER - Motos insolites - Motos japonaises - Unusual Motorcycles - Scooters du Monde - Motos Passion - Motos GILLET - Liens - Contact

Moto Collection - François-Marie Dumas

Valid XHTML 1.0 Transitional CSS Valide !

Mentions légales