Built around Sinnis's naked motorcycle platform, the 2021 Sinnis RSX125 relies on a 125 cc (7.6 cu in) air-cooled single cylinder, four-stroke powerplant. In factory specification, peak output is rated at 11 HP (8 kW) at 9,500 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 88 HP per liter, the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.
On the scales, the RSX125 measures 140 kg (309 lbs) dry, translating to a power-to-weight ratio of 0.08 HP/kg (12.73 kg per horsepower). Rider ergonomics and chassis geometry center around a 800 mm (31.5 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,330 mm (52.4 in) wheelbase engineered for quick, flickable steering geometry. The 13.5-liter (3.6 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Specific Output
88 HP/L
Power-to-Weight
0.08 HP/kg (12.73 kg/HP)
Standover Height
800 mm (31.5 in)
Engine
Displacement125.0 ccm (7.63 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power11.0 HP (8.0 kW)) @ 9500 RPM
Fuel SystemInjection. EFI
Fuel ControlSingle Overhead Cams (SOHC)
CoolingAir
Transmission
Gearbox5-speed
Final DriveChain (final drive)
Chassis
Front SuspensionTelescopic forks
Rear SuspensionAdjustable Single Monoshock
Wheelbase1330 mm (52.4 inches)
Wheels & Brakes
Front Tyre100/70-17
Rear Tyre100/70-17
Front BrakesSingle disc. Hydraulic.
Front Brake Ø280 mm (11.0 inches)
Rear BrakesSingle disc. Hydraulic.
Rear Brake Ø230 mm (9.1 inches)
Dimensions & Weight
Dry Weight140.0 kg (308.6 pounds)
Power/Weight0.0786 HP/kg
Seat Height800 mm (31.5 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.
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.
