Engineered by Triumph for the classic motorcycle segment, the 2018 Triumph Bonneville Bobber relies on a 1200 cc (73.2 cu in) liquid-cooled twin, four-stroke powerplant. In factory specification, peak output is rated at 77 HP (56.2 kW) at 6,550 rpm while maximum torque reaches 106 Nm (78.2 lb-ft) at 4,000 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 64.2 HP per liter and a 2,550 rpm working window between peak torque (4,000 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 Bobber measures 228 kg (503 lbs) dry, translating to a power-to-weight ratio of 0.34 HP/kg (2.96 kg per horsepower). Rider ergonomics and chassis geometry center around a 690 mm (27.2 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,510 mm (59.4 in) wheelbase engineered for balanced agility and highway composure. The 10.6-liter (2.8 US gal) fuel tank paired with a rated consumption of 4.5 L/100 km provides an estimated theoretical range of roughly 236 km (147 miles) between fill-ups.
Within MotoLibrary's Triumph archive, this model family spans 10 indexed model years from 2017 to 2026, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
64.2 HP/L
Power-to-Weight
0.34 HP/kg (2.96 kg/HP)
Power Band Window
4,000–6,550 rpm
Theoretical Range
~236 km (147 mi)
Engine
Displacement1200.0 ccm (73.22 cubic inches)
Engine TypeTwin, four-stroke
Engine Details270° crank angle parallel twin
Power77.0 HP (56.2 kW)) @ 6550 RPM
Torque106.0 Nm (10.8 kgf-m or 78.2 ft.lbs) @ 4000 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
LubricationWet sump
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchWet, multi-plate assist clutch
DrivelineX ring chain. Primary drive: Gear.
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)
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.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
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.
