Triumph T120 R Bonneville 1961 - Specifications & Review

T120 R Bonneville

Article Complete Info

Articleid884433
CategorySport
MakeTriumph
ModelT120 R Bonneville
Year1961

Chassis, Suspension, Brakes & Wheels

FrametypeDuplex frame
FrontbrakesExpanding brake (drum brake)
Frontbrakesdiameter203 mm (8.0 inches)
FrontsuspensionTelescopic fork, hydraulic damping.
Fronttyre3.25-18
RearbrakesExpanding brake (drum brake)
Rearbrakesdiameter178 mm (7.0 inches)
RearsuspensionTwin shocks. Girlings 100 lb/ft spring tension, adjustable pre-set.
Reartyre4.00-18
SeatDual seat
WheelsWire spoked

Engine & Transmission

Borexstroke71.0 x 82.0 mm (2.8 x 3.2 inches)
ClutchMulti-plate, wet
Compression8.5:1
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)) @ 6500 RPM
Topspeed185.0 km/h (115.0 mph)
TransmissiontypefinaldriveChain

Other Specifications

ColoroptionsSky Blue/Silver Sheen/Gold Pinstripe
CommentsRoad model with low exhaust pipes.
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 T120 R Bonneville 1961

The 1961 Triumph T120 R Bonneville stands as a testament to the golden age of British motorcycling, combining classic design with spirited performance. Positioned in the sport category, this motorcycle captured the hearts of riders seeking both style and speed. Revered for its role in the café racer culture and its success on the racetrack, the T120 R Bonneville is a piece of history that continues to resonate with enthusiasts today. Its elegant lines and distinctive color options—Sky Blue, Silver Sheen with a Gold Pinstripe—make it a striking presence on the road.

At the heart of the Bonneville lies a robust 649cc twin-cylinder, four-stroke engine, delivering an impressive 46 horsepower at 6,500 RPM. This powerplant not only provides exhilarating acceleration but also allows the motorcycle to reach top speeds of 185 km/h (115 mph). The refined engineering, with a compression ratio of 8.5:1 and a classic Amal monobloc carburettor, ensures a responsive throttle and an engaging ride. The 4-speed gearbox, complemented by a chain final drive, enhances the riding experience, allowing riders to smoothly shift through gears while enjoying the signature rumble of the Triumph twin.

The T120 R Bonneville showcases a host of features that reflect its era's innovative spirit. The duplex frame offers a balance of strength and agility, while the telescopic fork and twin shock rear suspension provide a comfortable and controlled ride. Drum brakes at both ends ensure reliable stopping power, though they may not compare to modern braking systems. With a weight of 178 kg (392 pounds) and a power-to-weight ratio of 0.2584 HP/kg, this motorcycle feels nimble and responsive, perfect for spirited rides on winding roads. The low exhaust pipes add to its aesthetic appeal while contributing to the bike's distinct character.

Pros:

  1. Iconic Design: The T120 R Bonneville's classic styling, highlighted by its elegant color options and low exhaust configuration, makes it a standout piece in any collection.
  2. Engaging Performance: With a powerful engine and nimble handling, the motorcycle provides an exhilarating riding experience that appeals to both casual and competitive riders.
  3. Heritage and Value: As a piece of motorcycling history, the Bonneville often appreciates in value, making it not just a joy to ride but also a wise investment.

Cons:

  1. Limited Braking Performance: The drum brakes, while sufficient for their time, may feel inadequate compared to modern disc systems, particularly for high-speed riding.
  2. Vibration and Comfort: The classic design may lead to a more rigid ride, with vibrations felt at higher speeds, which could be less comfortable on long journeys.
  3. Maintenance Needs: As a vintage motorcycle, the T120 R requires regular maintenance and care to keep it running smoothly, which may not appeal to all riders.

In essence, the 1961 Triumph T120 R Bonneville is much more than just a motorcycle; it’s a celebration of an era defined by innovation, speed, and style. Whether displayed in a collection or roaring down a country lane, it embodies the spirit of adventure that continues to inspire riders around the world.

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