KTM 50 SX Mini - 2018 Specifications and Reviews

The 2018 KTM 50 SX Mini is a lightweight minibike designed for young riders and beginners learning fundamental motorcycle skills. Known for its compact dimensions, responsive handling, and aggressive styling, this entry-level machine combines KTM's racing heritage with accessible performance. Its low seat height and minimal weight make it ideal for building confidence before progressing to larger bikes.

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Engine and Transmission Specifications

Driveline11:40. Primary drive: 33:61 straight cut spur gear.
ClutchCentrifugal clutch (adjustable)
Transmission type,final driveChain
Gearbox1-speed
Cooling systemLiquid
Lubrication systemMixture oil lubrication
IgnitionSeletra 2p D36
Fuel systemCarburettor
Bore x Stroke39.5 x 40.0 mm (1.6 x 1.6 inches)
Engine detailsReed intake.
Engine typeSingle cylinder, two-stroke
Capacity:49.00 ccm (2.99 cubic inches)

CategoryMinibike, cross
Year2018
ModelKTM 50 SX Mini

Brakes, suspension, Frame and wheels

Rear brakes diameter160 mm (6.3 inches)
Rear brakesSingle disc
Front brakes diameter160 mm (6.3 inches)
Front brakesSingle disc
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 typeCentral-tube frame with double-cradle
 
 

Physical measures and capacities

Fuel capacity2.30 litres (0.61 gallons)
Wheelbase1,032 mm (40.6 inches)
Ground clearance184 mm (7.2 inches)
Overall length914 mm (36.0 inches)
Seat height558 mm (22.0 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
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 Reviews

Total comments: 1
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MotorcycleDB Review

The 2018 KTM 50 SX Mini is a fantastic motorcycle for young riders who are just starting out in the world of motocross. This bike is designed specifically for kids, with a lightweight frame and a low seat height that makes it easy for young riders to handle. The automatic transmission and power-adjustable brakes also help to make the 2018 KTM 50 SX Mini a great choice for beginners. In addition to being easy to handle, the 2018 KTM 50 SX Mini also offers impressive performance on the track. The bike's two-stroke engine delivers plenty of power, and its high-quality suspension system helps to smooth out rough terrain. With its race-inspired design and top-notch build quality, the 2018 KTM 50 SX Mini is a great option for young riders who want to start their motocross journey off on the right foot.
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