KTM 50 SX - 2019 Specifications and Reviews

The 2019 KTM 50 SX is a lightweight entry-level motocross bike engineered for young riders and beginners seeking competitive off-road performance. Known for its aggressive styling, responsive handling, and quality WP suspension, it delivers the durability and capability needed for serious youth racing. The compact frame and low seat height make it accessible for smaller riders while maintaining genuine dirt bike credentials.

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Engine and Transmission Specifications

ClutchCentrifugal clutch
Transmission typeChain   (final drive)
Gearbox1-speed
Cooling systemLiquid
Lubrication systemMixture oil lubrication
IgnitionSeletra 2p D36
Fuel systemCarburettor. Mikuni TMX
Bore x Stroke39.5 x 40.0 mm (1.6 x 1.6 inches)
Engine detailsReed intake
Engine typeSingle cylinder, two-stroke
Capacity:49.0 ccm (2.99 cubic inches)
 
 

CategoryCross / motocross
Year2019
ModelKTM 50 SX
 
 

Brakes, suspension, Frame and wheels

WheelsWire spoked
Rear brakesSingle disc. Two-piston calipers.
Diameter160 mm (6.3 inches)
Front brakesSingle disc. Four-piston calipers.
Rear wheel travel185 mm (7.3 inches)
Rear SuspensionWP shock absorber
Front wheel travel205 mm (8.1 inches)
Front SuspensionWP upside-down Ø 35 mm
Rake (fork angle)24.0°
Frame typeCentral-tube frame with double-cradle

Physical measures and capacities

Fuel capacity2.30 litres (0.61 US gallons)
Wheelbase1032 mm (40.6 inches)
Ground clearance252 mm (9.9 inches)
Seat height684 mm (26.9 inches) If adjustable, lowest setting.
Dry weight41.5 kg (91.5 pounds)

Other specs

MaintenanceFind parts, fluids, filters, maintenance tools and service items on eBay
CommentsThe engine power can be restricted to 5.5 hp with a kit.
StarterKick
Color optionsOrange/white/black

Performance Profile & Rider Fit

Best For

Track55%
City5%
Cornering60%
Daily Riding5%
Touring5%
Passenger0%

Rider Profile

Best ForThis is a first motorcycle built for young children just starting out in motocross, not for teen or adult riders of any skill level.
PurposeIt exists purely to teach a child the fundamentals of balance, throttle control, and off-road riding in a safe, low-powered package.
Rider FitIts very low 653 mm seat height and lightweight small-bore chassis are sized specifically for small children, with an adjustable centrifugal clutch to tailor power delivery to their skill.
CharacterIt behaves like a purpose-built miniature dirt bike, docile and forgiving with an automatic single-speed gearbox that removes clutch and shifting complexity so a child can focus on riding.
Not Ideal ForIt is not suitable for adults, taller teens, road use, touring, or anyone seeking real speed or highway capability.

Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.

Rider Fit Visualizer

2019 KTM 50 SX Rider Ergonomics Assessment

Calculated in your browser only - your height/inseam are never sent to our servers.

Feet:

At 684mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with both feet flat on the 2019 KTM 50 SX, with a cramped knee angle of around 55 degrees and an upright riding position.

Data quality: measured. Assumes about 30mm of suspension sag once seated (a typical street-bike rule of thumb - stiffer or softer suspension will vary). This is an approximation from category-typical geometry and generic body proportions, not a measurement of this specific bike or you - sit on it before you buy.

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Rider Reviews

Total comments: 1
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MotorcycleDB Review

The 2019 KTM 50 SX is a powerful and reliable motorcycle that delivers an exhilarating riding experience for both beginners and experienced riders. With its lightweight frame and high-performance engine, this bike offers impressive speed and agility on the trails. The adjustable suspension and high-quality components make for a smooth and comfortable ride, while the responsive brakes and intuitive handling provide precision control for riders of all skill levels. Whether you're hitting the track or exploring off-road terrain, the KTM 50 SX delivers top-notch performance and exceptional durability. In addition to its impressive performance capabilities, the 2019 KTM 50 SX also stands out for its sleek and modern design. The striking orange frame and bodywork make a bold statement, while the ergonomic seat and ergonomic controls ensure optimal comfort and maneuverability. With its advanced technology and rugged construction, this bike is a top choice for riders seeking a thrilling and reliable motorcycle for their adventures. Whether you're a competitive racer or a casual rider, the 2019 KTM 50 SX is a standout choice for anyone in search of a high-quality and high-performance motorcycle.
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