KTM 50 SX Mini - 2019 Specifications and Reviews

The 2019 KTM 50 SX Mini is a lightweight, accessible entry-level motocross bike designed for young and beginner riders. Known for its nimble handling and manageable power delivery, it features a compact frame with a low 684mm seat height and advanced suspension technology scaled for smaller riders. The model excels in competitive youth racing and recreational riding with its potent braking system and durable construction.

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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 Mini

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 travel147 mm (5.8 inches)
Rear SuspensionWP shock absorber
Front wheel travel100 mm (3.9 inches)
Front SuspensionWP upside-down Ø 35 mm
Rake (fork angle)24.0°
Frame typeChrome-molybdenum steel central-tube frame
 
 

Physical measures and capacities

Fuel capacity2.10 litres (0.55 US gallons)
Wheelbase1032 mm (40.6 inches)
Ground clearance252 mm (9.9 inches)
Seat height684 mm (26.9 inches) If adjustable, lowest setting.
Dry weight40.0 kg (88.2 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

5.5 hp
Peak Power (est.)

Best For

Track30%
City2%
Cornering40%
Daily Riding3%
Touring1%
Passenger0%

Rider Profile

Best ForThis machine is built exclusively for young beginner riders taking their very first steps into motocross, typically aged around four to seven years old.
PurposeIt exists purely to teach small children the basics of throttle control, balance, and off-road riding on a real motocross-style bike in a safe, controlled way.
Rider FitIts tiny 40 kg dry weight, low 684 mm seat height, and single-speed automatic clutch mean it demands almost no physical strength or shifting skill from its young rider.
CharacterIt behaves like a proper miniature motocrosser, with real suspension, a real frame, and real brakes, giving a authentic but gentle introduction to dirt bike riding.
Not Ideal ForIt is completely unsuitable for adults, teenagers, road use, touring, or any rider who has outgrown beginner-level youth motocross machines.

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

Rider Fit Visualizer

2019 KTM 50 SX Mini 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 Mini, 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 Mini is a top-of-the-line motocross bike designed specifically for young riders. With its powerful 2-stroke engine, lightweight chassis, and adjustable suspension, this bike delivers impressive performance and handling for young riders looking to hone their skills on the track. The bike's compact design and ergonomics make it easy for smaller riders to maneuver, while the high-quality components and durable construction ensure a long-lasting and reliable ride. Overall, the 2019 KTM 50 SX Mini is a fantastic choice for young riders looking for a competitive and capable motocross bike. In conclusion, the 2019 KTM 50 SX Mini is a solid choice for young riders looking to take their skills to the next level. Its powerful engine, lightweight design, and adjustable suspension make it a top contender in the minibike market. For parents and riders looking for a top-of-the-line motocross bike that offers impressive performance and durability, the 2019 KTM 50 SX Mini is a solid choice that won't disappoint.
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