2017 KTM 50 SX


Vital MX - KTM is upping the game for the groms once again, by updating their entire line of mini SX models to give the youngsters the best advantage possible. Check out what's new with the KTM 50 SX, 65 SX, and 85SX. Below you'll find the information for the KTM 50 SX, on page two will be the KTM 65 SX, page three the KTM 85 SX, and finally on page four is KTM's presentation for the new models; including a comparison chart for the 50 SX Mini, 50 SX, 65 SX, and 85 SX.

The 50 SX is a true READY TO RACE KTM for young MX riders. It is a genuine dirt bike that, like its bigger siblings, is produced with top-quality components. This makes the 50 SX the first choice as a stepping stone into the world of MX or for the first racing step on the ladder. With the youngster in mind this package has an engine that delivers steady, controllable power, incorporating an automatic clutch that allows the rider to concentrate on the track, not shifting. This year’s model features revolutionary WP AER 35 front forks, fully adjustable rear suspension, a new exhaust, ultra-cool graphics and detail improvements that make going fast fun.


  • New WP AER 35 air-sprung fork is easily adjustable for different rider sizes as well as track conditions.

  • New fully adjustable rear suspension to match the performance of the WP AER 35 fork.

  • Newly developed exhaust pipe provides better power delivery and more peak power over the entire rev range.
  • A 3-shaft engine design keeps the crankshaft close to the bike’s center of gravity for quick handling along with room for an optimized reed valve angle for maximum performance.

  • Bodywork that mimics the full-size 2017 SX-F line that gives the 50 SX a slim profile for excellent ergonomics and handling.
  • Front and rear hydraulic brakes by Formula combined with lightweight WAVE discs are powerful with feedback that gives control for any skill level.
  • A centrifugal multi-disc automatic clutch provides manageable acceleration and can be adjusted to the track conditions in minutes without tools.
  • Super lightweight, black anodized aluminum rims are matched to MAXXIS tires for maximum grip.


  • Engine Type: Single Cylinder
  • 2-Stroke Displacement: 49 cc
  • Bore/Stroke: 39.5/40.0mm
  • Starter: Kickstarter
  • Transmission: Rigid 1-Stage Reduction Gear
  • Fuel System: Dell’Orto PHBG 19 BS
  • Lubrication: Premix 60:1
  • Primary Ratio: 33:61
  • Straight Cut Reduction Gear Final Drive: 11:40
  • Cooling: Liquid Cooling
  • Clutch: Centrifugal Clutch (Adjustable)
  • Ignition: Selettra 2p D36
  • Frame: Central Tube Frame, Chrome Molybdenum
  • Subframe: Steel
  • Handlebar: Renthal, Aluminum 22mm
  • Front Suspension: WP AER 35mm USD
  • Rear Suspension: WP Monoshock
  • Suspension Travel Front/Rear: 205mm/8.07in; 185mm/7.28in
  • Front/Rear Brakes: Disc Brake 160mm; 160mm
  • Front/Rear Rims: 1.50 x 12”, 1.60 x 10”
  • Front/Rear Tires: 60/100 x 12”; 2.75 x 10”
  • Chain: 1/2 x 3/16in
  • Silencer: Aluminum
  • Steering Head Angle: 24.0º
  • Triple Clamp Offset: 22mm
  • Wheelbase: 1,032mm ± 10mm / 40.6 ± 0.4in
  • Ground Clearance: 252mm / 9.92in
  • Seat Height: 684mm / 26.9in
  • Tank Capacity, Approx: 2.3L / 0.61gal
  • Weight (without fuel), Approx: 40.8kg/ 90lbs

First Look: 2017 KTM 50 SX, 65 SX, and 85 SX

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