Like Mondial and Gilera, Moto Guzzi had withdrawn from the road racing World Championship after 1957. They nevertheless wanted to remain active in the sporting field, and in addition, they still had the sports department, where Giulio Cesare Carcano, Enrico Cantoni and Umberto Todaro worked as development engineers.
They threw themselves into the International Six Days Trial, a series of gruelling tests of machine, rider skill, and reliability for the 'Regolaristi' riding their off-road machines. With a few adjustments, the Moto Guzzi Lodola was combat-ready in 1958. The Six Days Trials models were equipped with stronger front forks, vertical rear shock absorber with external coil springs, higher handlebars, raised mudguards and exhausts, studded "trials" tires and more sturdy saddle.
These machines were used by Gianfranco Saini, Sergio Cremaschini and Brunone Villa in the Trofeo Reda in Bergamo. This competition was considered a test and formed the basis for the machines of the following years.
Two versions appeared in 1959: the Regolarità 175 and the Regolarità 235. The 175 received larger wheels, a reinforced frame, an airbox for the carburettor, a quickly exchangeable tank and a folding kick-starter. Later the machine received a reinforced steering head and a shortened swing arm to improve handling.
Engine: 45 degree single cylinder four-stroke OHC
Bore & stroke: 62.0 x 57.8 mm (2.4 x 2.2 inches)
Compression ratio: 7:1
Engine Capacity: 172.3cc
Maximum power: 11 h.p. (8.0 kW) @ 6,500 rpm
Distribution: Single overhead camshaft driven by chain
Ignition: Flywheel-magneto, 6V-40W
Carburettor: Dell'Orto 22 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: Open cradle 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 21"
Rear Tyre: 2.75 x 21"
Seat: sprung solo saddle
Fuel tank capacity: 14 litres
Weight: 110 Kg (240 lb)
Top speed: 110 km/h (68.4 mph)
Source: Hessink's NL