Built around Triumph's classic motorcycle platform, the 2021 Triumph Bonneville T120 features a 1200 cc (73.2 cu in) liquid-cooled twin, four-stroke configuration. In factory specification, peak output is rated at 79.1 HP (57.8 kW) at 6,550 rpm while maximum torque reaches 105 Nm (77.4 lb-ft) at 3,500 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 65.9 HP per liter and a 3,050 rpm working window between peak torque (3,500 rpm) and peak power (6,550 rpm), the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.
On the scales, the Bonneville T120 measures 235.9 kg (520 lbs) wet (curb), translating to a power-to-weight ratio of 0.34 HP/kg (2.98 kg per horsepower). Rider ergonomics and chassis geometry center around a 790 mm (31.1 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,450 mm (57.1 in) wheelbase engineered for balanced agility and highway composure. The 14.5-liter (3.8 US gal) fuel tank paired with a rated consumption of 4.5 L/100 km provides an estimated theoretical range of roughly 322 km (200 miles) between fill-ups.
Within MotoLibrary's Triumph archive, this model family spans 11 indexed model years from 2016 to 2026, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
65.9 HP/L
Power-to-Weight
0.34 HP/kg (2.98 kg/HP)
Power Band Window
3,500–6,550 rpm
Theoretical Range
~322 km (200 mi)
Engine
Displacement1200.0 ccm (73.22 cubic inches)
Engine TypeTwin, four-stroke
Power79.1 HP (57.8 kW)) @ 6550 RPM
Torque105.0 Nm (10.7 kgf-m or 77.4 ft.lbs) @ 3500 RPM
Compression10.0:1
Bore x Stroke97.6 x 80.0 mm (3.8 x 3.1 inches)
Valves/Cylinder4
Fuel SystemInjection. Multipoint sequential electronic fuel injection with SAI
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionDigital-inductive type via engine management system
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchWet, multi-plate, assist clutch
Performance
Fuel Consumption4.50 litres/100 km (22.2 km/l or 52.27 mpg)
Greenhouse Gases104.4 CO2 g/km. (CO2 - Carbon dioxide emission)
Emission DetailsEuro 4
ExhaustChromed 2 into 2 exhaust system with twin chrome silencers
Chassis
Frame TypeTubular steel, with twin cradles
Rake25.5°
Trail105 mm (4.1 inches)
Front Suspension41mm cartridge forks
Front Travel120 mm (4.7 inches)
Rear SuspensionTwin RSU’s, with pre-load adjustment
Rear Travel120 mm (4.7 inches)
Wheelbase1450 mm (57.1 inches)
Wheels & Brakes
Front Tyre100/90-18
Rear Tyre150/70-R17
Front BrakesSingle disc. ABS. Brembo 2-piston floating caliper
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Torque
Torque is useful for judging real-world pull, especially for touring, commuting and loaded riding.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
