Photo ou archives : Ph. Horville
Modern trials machine 100% french made
In 1983 joel Corroy, a motorcycle dealer from Vésoul in center of France, founded his JCM marque. A keen trials rider and brilliant engineer, he had conceived a modern trials machine, with progressive single-damper rear suspension, a potent Italian Tau engine and a compact frame that was highly amenable to the best level of development. From the start, the JCM proved extremely competitive.
A Difficult Beginning
There's a vast gulf fixed berween creating a prototype and putting it into produclion. Joel Corroy burned up a vast amount of money, energy and hope. The lack of competent subcontractors in the French motorcycle business saw jCM run out of funds. Joel
Corroy then became associated with Streif, a major local automotive supplier who bought the JCM business in 1987.
Now JCM had adequate funds and the backing of the CAO industrial group. At the
1989 Paris Salon, the marque displayed a fine range of ten models with its own-make
engines, available in three capacities and four stages of tune. Unfortunately, the commercial results didn't equal the large amount of money invested. Furthennore. at that lime the competition unleashed a wave of high-tech features to which even the flagship SR250 model was unable to respond. The punishment was grim: from 1990, JCM was condemned to assemble to order, using its own frames with Spanish Gas-Gas engines.
Engine: 2)9cc (71.3x60mm) water-cooled single-cylinder
Power Rating: 19 hp@ 6000 rpm
Valves: two-stroke; automatic inlet valves
Fuel System: carburetor
Transmission: 6-specd; chain final drive
Suspension: telescopic forks (front); swinging arm (rear)
Brakes: 13rembo disks (front & rear)
Wheels: tubeless tires; 2.75x21 inch (front); 400x18 inch (rear)
Weight: 190 lb
Despite its excellent performance, the ]CM SR250 was unable to make headway against the competition in the close-knit world of trials riding.