At the heart of the 2021 Benelli BN 125 naked motorcycle, Benelli features a 125 cc (7.6 cu in) air-cooled single cylinder, four-stroke configuration. In factory specification, peak output is rated at 11.1 HP (8.1 kW) at 9,500 rpm while maximum torque reaches 10 Nm (7.4 lb-ft) at 7,000 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 88.8 HP per liter and a 2,500 rpm working window between peak torque (7,000 rpm) and peak power (9,500 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 BN 125 measures 142 kg (313 lbs) wet (curb), translating to a power-to-weight ratio of 0.08 HP/kg (12.79 kg per horsepower). Rider ergonomics and chassis geometry center around a 770 mm (30.3 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,360 mm (53.5 in) wheelbase engineered for quick, flickable steering geometry. The 13.5-liter (3.6 US gal) fuel tank paired with a rated consumption of 1.7 L/100 km provides an estimated theoretical range of roughly 794 km (493 miles) between fill-ups.
Within MotoLibrary's Benelli archive, this model family spans 7 indexed model years from 2018 to 2024, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
88.8 HP/L
Power-to-Weight
0.08 HP/kg (12.79 kg/HP)
Power Band Window
7,000–9,500 rpm
Theoretical Range
~794 km (493 mi)
Engine
Displacement125.0 ccm (7.63 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power11.1 HP (8.1 kW)) @ 9500 RPM
Torque10.0 Nm (1.0 kgf-m or 7.4 ft.lbs) @ 7000 RPM
Compression9.8:1
Bore x Stroke54.0 x 54.5 mm (2.1 x 2.1 inches)
Fuel SystemInjection. Electronic fuel injection with throttle body d.28
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionDelphi
LubricationForced lubrication with wet sump
CoolingAir
Transmission
Gearbox5-speed
Final DriveChain (final drive)
ClutchWet multi-plate
Performance
Fuel Consumption1.70 litres/100 km (58.8 km/l or 138.37 mpg)
Greenhouse Gases39.4 CO2 g/km. (CO2 - Carbon dioxide emission)
Emission DetailsEuro 4. Catalytic Converter and Oxygen Sensor.
Chassis
Frame TypeTrestle in steel tubes
Front SuspensionTelescopic fork
Front Travel111 mm (4.4 inches)
Rear SuspensionRear swing arm with central shock absorber with spring pre-load adjustment
Rear Travel40 mm (1.6 inches)
Wheelbase1360 mm (53.5 inches)
Ground Clearance190 mm (7.5 inches)
Wheels & Brakes
Front Tyre110/80-17
Rear Tyre130/70-17
Front BrakesSingle disc
Front Brake Ø260 mm (10.2 inches)
Rear BrakesSingle disc
Rear Brake Ø240 mm (9.4 inches)
Dimensions & Weight
Weight incl.142.0 kg (313.1 pounds)
Seat Height770 mm (30.3 inches) If adjustable, lowest setting.
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.
