The KTM 50 SX is a really cute little bike that’s got a lot more attitude than its size will let on. As the smallest bike in the SX line-up, the 50 SX is the ideal enduro ride young people - ages thee to four - can enjoy as they begin their first taste of what enduro racing is all about.

The 50 SX weighs only 88 lbs and was designed to be as fun and as safe as any entry-level bike. After all, it’s important to have a bike that kids can not only have fun in, but also be something that adults can trust with their children.

The KTM 50 SX has everything that impresses riders up to a height of 1.30 m (4.27 ft) while also reassuring the parents that it’s been built with a high-quality chassis with easily applied disc brakes, top-quality components, and a powerful, reliable engine with easy-to-operate centrifugal clutch.

The engine isn’t a monster by any stretch of the imagination, making it an ideal ride for young ones everywhere. And since the clientele for this bike revolves around kids, KTM designed the 50 SX to carry a centrifugally controlled automatic clutch that doesn’t put the onus on junior racers worry about changing gears. All they need is to hit the gas and the bike’s ready to go.

A high-quality, aluminum alloy, Renthal handlebars was also designed specifically for the 50 SX to create the ergonomic conditions for optimum control of the vehicle. In particular, 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.

It’s easy, as a parent, to worry about your kids anytime they ride a motorcycle, but if there’s one bike that parents know will treat their little ones right, it’s the KTM 50 SX.

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

  • 2012 KTM 50 SX
  • Year:
  • Make:
  • Model:
  • Engine:
    1-cylinder 2-stroke engine, water-cooled, with reed intake
  • Energy:
    Dell’Orto PHBG 19 BS
  • Displacement:
    2.99 cubic inches
  • Price:


2012 KTM 50 SX High Resolution Exterior
- image 434925

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.

Frame and Suspension Components

2012 KTM 50 SX High Resolution Exterior
- image 434926

The 50 SX’s chassis is equipped exclusively with high-quality components - from the sturdy chrome-molybdenum steel frame to the newly developed WP upside-down fork. The torsionally, extremely stiff 35 mm (1.38 in) telescopic fork with new, forged triple clamps and 185 mm (7.28 in) suspension travel provides perceptibly better ride stability and more comfortable suspension.


2012 KTM 50 SX High Resolution Exterior
- image 434927

High-quality, hydraulically actuated disc brakes, with hip wave brake discs at the front and rear, ensure that riders of the 50 SX can rein in their zest for action sensitively and bring their beloved KTM bike to halt - if needs be - in no time at all.

Optional Restrictor Kit

2012 KTM 50 SX High Resolution Exterior
- image 434929

Your authorized KTM dealer can provide concerned parents with a power-reduction kit from the PowerParts range - only for such cases where the young rider can’t cope with the propulsion of the water-cooled two-stroke engine developed specifically for the 50 SX.


2012 KTM 50 SX High Resolution Exterior
- image 434923
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 Mixture oil lubrication
Primary gear ratio 33:61 straight cut spur gear
Final drive 11:40
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 205 mm (8.07 in)
Suspension travel Rear 185 mm (7.28 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 66°
Wheel base 1,032±10 mm (40.63±0.39 in)
Ground clearance (unloaded) 252 mm (9.92 in)
Seat height (unloaded) 684 mm (26.93 in)
Weight without fuel approx. 41.5 kg (91.5 lb.)


Athingforcars----"KTM could be the simply muck bike producer to supply bike riders the actual motorcycle between that in the 450 in addition to 300 four-stroke program having its 350 SX-F. When the gas starts acquiring older most of us recognized how the real 350 started to be fairly harder to be able to alter so that it necessary to make sure an individual change it out away often."

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