As did Gilera and Moto Guzzi, Mondial withdrew from the road-racing World Championship after 1957. Mondial nevertheless wanted to remain active in the sporting field and turned increasingly to off-road competition, principally the International Six Days Trial, as a means of keeping its name in the public eye. In 1958 they entered the ISDT, a series of speed trials over rough terrain, with the Mondial 175 Regolarità. The first event was the Trofeo Reda in Bergamo.
The machine had a stronger forks, a vertical shock absorber with external coil springs in the rear, higher handlebars, raised mudguards and exhausts, knobby tyres and a sturdy saddle.
Two versions appeared in 1959, the F.B. Mondial Regolarità 175 and the Regolarità 235. The machine had a dust filter on the carburettor, and a quickly detachable tank and a folding kick-starter were added. The tyre sizes were enlarged, a reinforced frame and steering head were fitted, and the rear swinging arm was shortened to enhance off-road handling.
Engine: Single cylinder four-stroke OHV
Bore & stroke: 65 x 54.5 mm
Compression ratio: 6.5:1
Engine Capacity: 175cc
Maximum power: 13 h.p. @ 7,000 rpm
Valves per cylinder: 2
Carburettor: Dell'Orto, diam. 25 mm
Cooling system: Air cooled
Lubrication: Wet sump forced circulation with mechanical gear pump
Transmission: Gear primary, chain final
Clutch: Cable operated with multiple wet disc in oil bath
Gearbox: 4-Speed, foot-change
Throttle: Cable operated
Frame type: Tubular and pressed steel
Front Suspension: Telescopic fork and shock absorbers
Rear Suspension: Swingarm with hydraulic shock absorbers
Front Brake: Drum
Rear Brake: Drum
Front Tyre: 2.75 x 19"
Rear Tyre: 2.25 x 18"
Seat: Dual seat
Fuel tank capacity:
Fuel consumption: 2.5 litres per 100 Km.
Top speed: approx. 105 km/h
Source: Hessink's NL
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