Triumph T120 Bonneville - Specifications & Review

T120 Bonneville

Article Complete Info

Articleid513516
CategorySport
MakeTriumph
ModelT120 Bonneville
Year1960

Chassis, Suspension, Brakes & Wheels

FrametypeDuplex frame
FrontbrakesExpanding brake (drum brake)
Frontbrakesdiameter203 mm (8.0 inches)
FrontsuspensionTelescopic fork.
Fronttyre3.25-18
RearbrakesExpanding brake (drum brake)
Rearbrakesdiameter178 mm (7.0 inches)
RearsuspensionTwin shocks. Girlings 100 lb/ft spring tension, adjustable pre-set.
Reartyre3.50-18
SeatDual seat

Engine & Transmission

Borexstroke71.0 x 82.0 mm (2.8 x 3.2 inches)
ClutchMulti-plate, wet
CoolingsystemAir
Displacement649.00 ccm (39.60 cubic inches)
EnginedetailsTwin, four-stroke
FuelsystemCarburettor. Amal monobloc carburettor
Gearbox4-speed
IgnitionLucas K2F auto-advance Magneto
Power46.00 HP (33.6 kW)) @ 6700 RPM
Topspeed185.0 km/h (115.0 mph)
TransmissiontypefinaldriveChain

Other Specifications

ColoroptionsPearl Grey/Azure Blue
ElectricalAC Alternator

Physical Measures & Capacities

Dryweight178.0 kg (392.4 pounds)
Fuelcapacity15.14 litres (4.00 gallons)
Groundclearance127 mm (5.0 inches)
Powerweightratio0.2584 HP/kg
Seatheight770 mm (30.3 inches) If adjustable, lowest setting.

About Triumph

Country of Origin: United Kingdom
Founder: Siegfried Bettmann (original); modern Triumph Motorcycles Ltd.
Best Known For: Modern classics (Bonneville), Speed/Street Triple, Tiger ADV, and rich heritage

Company History

Triumph rose, fell, and rose again—reinvented as a modern manufacturer blending heritage with sharp engineering. The Bonneville family anchors the brand with air-/liquid-cooled twins that feel timeless yet include ABS, ride modes, and refined fueling. The Speed/Street Triple lines defined playful, usable performance with characterful triples; Tiger ADV models carried that feel into distance. Triumph’s attention to finishing, dealer support, and approachable ergonomics built a wide audience—from new riders to veterans returning for a bike that feels special daily. Historically, Triumph proves that heritage can power innovation when it informs proportions, sound, and feel rather than dictating technology.

Other Years

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