At the heart of the 2025 KTM 50 SX minibike, cross motorcycle, KTM features a 49 cc (3 cu in) single cylinder, two-stroke configuration. Internal engine geometry specifies a bore and stroke of 39.5 x 40.0 mm (1.6 x 1.6 inches).
On the scales, the 50 SX measures 42.5 kg (94 lbs) dry. Rider ergonomics and chassis geometry center around a 653 mm (25.7 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,026 mm (40.4 in) wheelbase engineered for quick, flickable steering geometry. The 2.3-liter (0.6 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's KTM archive, this model family spans 19 indexed model years from 2006 to 2025, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
653 mm (25.7 in)
Engine
Displacement49.0 ccm (2.99 cubic inches)
Engine TypeSingle cylinder, two-stroke
Bore x Stroke39.5 x 40.0 mm (1.6 x 1.6 inches)
Fuel SystemCarburettor
IgnitionSeletra 2p D36 EMS
Transmission
GearboxAutomatic
Final DriveChain (final drive)
ClutchCentrifugal
Driveline415, Non-sealed chain
Chassis
Frame TypeChrome-molybdenum steel central-tube
Rake24.0°
Front SuspensionXACT 35 WP Upside-Down fork, Ø 35 mm
Front Travel200 mm (7.9 inches)
Rear SuspensionXACT WP mono shock
Rear Travel190 mm (7.5 inches)
Wheelbase1026 mm (40.4 inches)
Ground Clearance233 mm (9.2 inches)
Wheels & Brakes
Front BrakesSingle disc
Front Brake Ø160 mm (6.3 inches)
Rear BrakesSingle disc
Rear Brake Ø160 mm (6.3 inches)
WheelsSpoked wheels with aluminium rims. Maxxis tires.
Dimensions & Weight
Dry Weight42.5 kg (93.7 pounds)
Seat Height653 mm (25.7 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.
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.
