Built around Yamaha's scooter motorcycle platform, the 2018 Yamaha Mio Aerox 155 features a 155 cc (9.5 cu in) air-cooled single cylinder, four-stroke configuration. In factory specification, peak output is rated at 14.9 HP (10.9 kW) at 8,000 rpm while maximum torque reaches 13.8 Nm (10.2 lb-ft) at 6,250 rpm, transferring power to the rear wheel through a automatic gearbox and belt final drive. With a specific output of 96.1 HP per liter and a 1,750 rpm working window between peak torque (6,250 rpm) and peak power (8,000 rpm), the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.
On the scales, the Mio Aerox 155 measures 116 kg (256 lbs) wet (curb), translating to a power-to-weight ratio of 0.13 HP/kg (7.79 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 1,350 mm (53.1 in) wheelbase engineered for quick, flickable steering geometry. The 4.6-liter (1.2 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Specific Output
96.1 HP/L
Power-to-Weight
0.13 HP/kg (7.79 kg/HP)
Power Band Window
6,250–8,000 rpm
Standover Height
790 mm (31.1 in)
Engine
Displacement155.0 ccm (9.46 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Power14.9 HP (10.9 kW)) @ 8000 RPM
Torque13.8 Nm (1.4 kgf-m or 10.2 ft.lbs) @ 6250 RPM
Compression10.5:1
Bore x Stroke58.0 x 58.7 mm (2.3 x 2.3 inches)
Valves/Cylinder4
Fuel SystemInjection
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionTCI
CoolingAir
Transmission
GearboxAutomatic
Final DriveBelt (final drive)
ClutchDry, Centrifugal Automatic
Chassis
Frame TypeUnderbone
Front SuspensionTelescopic fork
Rear SuspensionUnit swingarm
Wheelbase1350 mm (53.1 inches)
Wheels & Brakes
Front Tyre110/80-14
Rear Tyre140/70-14
Front BrakesSingle disc
Rear BrakesExpanding brake (drum brake)
Dimensions & Weight
Weight incl.116.0 kg (255.7 pounds)
Seat Height790 mm (31.1 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.
