The KTM 50 SX Mini is practically a toy bike, built exclusively for young children looking to break into dirt bike racing. How young, exactly? Try three to four-year old children.

Remarkably light at just 88 lbs, the 50 MX Mini retains a high standard of safety, controllability, and plain overall fun. The ride height - 4.27 ft - is also short relative to the kids riding it and to give parents ease-of-mind, KTM built a high-quality chassis with easily applied disc brakes, top-quality components, and a reliable engine with an easy-to-operate centrifugal clutch.

The KTM 50 SX Mini is the perfect bike for beginner riders. It includes premium features like adjustable seat height, disc brakes at the front, and a long travel rear suspension, as well as the best power output available in the class.

Speaking of its power, the KTM 50 SX Mini boasts of a 50cc 1-cylinder, 2-stroke water-cooled engine that is mated to a centrifugally controlled automatic clutch, making it easier for junior racers to ride their bikes without worrying about the clutch or changing gear. Simply hitting the gas is enough. Similarly, the clutch can be adjusted in the workshop to the riding ability of the budding racer.

Starting slow is always the best option and once little riders get the hang of it, then you can let the bike loose.

Find out more about the KTM 50 SX Mini after the jump.

  • 2012 KTM 50 SX Mini
  • Year:
  • Make:
  • Model:
  • Engine:
    1-cylinder 2-stroke engine, with reed intake
  • Displacement:
    49cc L
  • Price:


2012 KTM 50 SX Mini Exterior Drivetrain
- image 434957

Thanks to the centrifugally controlled automatic clutch, junior racers need not worry about the clutch or changing gear. Simply hitting the gas is enough. The clutch can be adjusted in the workshop to the riding ability of the budding racer: nice and gentle for beginners, then later powerful and direct.

Water Cooling

2012 KTM 50 SX Mini Exterior
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The liquid-cooling system of the 50 SX, with two large radiators and additional cooling for the crankcase, prevents the engine overheating, even under the most extreme loads. Besides that, the smallest KTM can still take a fair bit of punishment - from enemy contact to contact with the ground.

Frame and Suspension

2012 KTM 50 SX Mini High Resolution Exterior
- image 434951

The 50 SX’s chassis is equipped exclusively with high-quality components - from the sturdy chrome-molybdenum steel frame to the torsionally stiff, multiple-adjustment WP upside-down telescopic fork with forged triple clamps, 35 mm (1.38 in) outer tubes and 185 mm (7.28 in) suspension travel.

Renthal Handlebars

2012 KTM 50 SX Mini High Resolution Exterior
- image 434949

High-quality, aluminum alloy, Renthal handlebars designed specifically for the 50 SX create the ergonomic conditions for optimum control of the vehicle. Power is now even more controllable with the new Domino throttle grip. The new, two-component rubber grips on the handlebars provide a secure hold for the hands, with the center strut bearing a crash pad should the worst come to the worst.


2012 KTM 50 SX Mini Exterior
- image 434953
Design 1-cylinder 2-stroke engine, water-cooled, with reed intake
Displacement 49.0 cm³ (2.99 cu in)
Bore 39.5 mm (1.555 in)
Stroke 40 mm (1.57 in)
Starting aid Kickstarter
Transmission Rigid 1-stage reduction gear
Engine lubrication Separate lubrication
Primary gear ratio 33:61 straight cut spur gear
Final drive 10:42
Cooling system Liquid cooling system
Clutch 3-lining automatic clutch on the main shaft / centrifugal force
Ignition system SELETTRA 2p D36
Frame Central tube frame of chrome molybdenum steel tubing, powder-coated
Forks WP Suspension USD 35
Shock absorber WP Suspension 3614 BAEM
Suspension travel Front 100 mm (3.94 in)
Suspension travel Rear 171 mm (6.73 in)
Brake system Front Disc brake with four-pot brake caliper
Brake system Rear Disc brake with two-pot brake caliper
Brake discs - diameter Front 160 mm (6.3 in)
Brake discs - diameter Rear 140 mm (5.51 in)
Chain 1/2 x 3/16”
Steering head angle 67.4°
Wheel base 914±10 mm (35.98±0.39 in)
Ground clearance (unloaded) 184 mm (7.24 in)
Seat height (unloaded) 558 mm (21.97 in)
Total fuel tank capacity approx. 2.0 l (2.1 qt.)
Unleaded premium fuel (95 RON)
Weight without fuel approx. 40.5 kg (89.3 lb.)


Motorcycle-USA----"With two large radiators and crankcase cooling, the KTM 50 SX Mini will be a tough one to overheat. This bike is made from high quality and the new, dual-compound rubber grips on the handlebar provide a secure hold for the hands, with the cross bar bearing a crash pad should you need one. The 50 SX Mini is a very lightweight bike that weighs in at 89.3 pounds empty with a 49cc engine that just makes this as fun as ever to ride."

What do you think?
Show Comments


  (488) posted on 02.3.2012

This mini bike has everything to impress the riders. It also offers top-quality components and a powerful engine with easy to control clutch. The standard is good when it comes to controlling and riding.

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