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New 2018 KTM 50SX 2018

: 0
: 50CC
: 50sx2018

The perfect launchpad into the MX world

A real KTM for young crossers from the age of about 4 to 10 and a height of up to approx. 1.30 m. A real motorcycle with high quality components that's child's play to control and whose engine excels with linear power development and a beginner-friendly automatic clutch.


Technical details

  • Frame design

    Central-tube frame with double-cradle

  • Front suspension

    WP upside-down Ø 35 mm

  • Rear suspension

    WP shock absorber

  • Suspension travel (front)

    100 mm

  • Suspension travel (rear)

    147 mm

  • Front brake

    Disc brake

  • Rear brake

    Disc brake

  • Front brake disc diameter

    160 mm

  • Rear brake disc diameter

    160 mm

  • Chain

    1/2 x 3/16"

  • Steering head angle

    67.4 °

  • Wheelbase

    914 ± 10 mm

  • Ground clearance

    184 mm

  • Seat height

    558 mm

  • Tank capacity (approx.)

    2.1 l

  • Weight READY TO RACE (without fuel)

    40 kg

  • Design

    1-cylinder, 2-stroke engine

  • Displacement

    49 cm³

  • Bore

    39.5 mm

  • Stroke

    40 mm

  • Starter


  • Transmission

    Single-speed automatic

  • Primary drive


  • Secondary gear ratio


  • Clutch

    Centrifugal clutch (adjustable)

  • EMS

    Seletra 2p D36



The modern, extremely compact, 2-stroke engine sets the benchmark in its class with its very controllable power. Thanks to the 3-shaft concept, the crankshaft is close to the bike's centre of gravity. This not only benefits the handling; it also provides a flow-optimized inflow angle at the intake membrane – a prerequisite for maximum performance.


Developed by KTM, the centrifugal multi-disc automatic clutch provides manageable acceleration and makes riding this motorcycle the easiest thing in the world. It can be adjusted to the specific requirements of the track and the rider in minutes and without any special tools.

Power reduction kit

For absolute beginners the engine power can be reduced to a moderate 5.5hp using a kit from the PowerParts program.

Automatic transmission

The centrifugally controlled, multi-disc automatic clutch developed by KTM delivers easily controllable acceleration and makes riding the 50 SX the easiest thing in the world. Furthermore, it can still be quickly and easily adjusted to the specific requirements of both track and rider using the "KTM clicker system" - in a matter of seconds and with no special tools required.


Just like the big KTM bikes, the 50 SX is also equipped with water cooling that even cools the crankcase. Generously dimensioned radiators ensure excellent heat dissipation and therefore high reliability, even under extreme loads.


The ergonomic Renthal handlebar made from a high-quality aluminum alloy ensures the highest levels of stability and safety. A Renthal crash pad around the centre brace protects the rider from hard knocks.


Just like the big factory bikes, the 50 SX is equipped with ultra-light, black anodized aluminum rims that easily withstand even the biggest of jumps. The 50 SX is now equipped with the very latest generation tire from MAXXIS, featuring a profile that guarantees optimum grip on every surface.


A high quality, upside-down telescopic fork from WP Suspension, featuring 35 mm diameter outer tubes and 100 mm suspension travel, ensures outstanding ride stability. A WP shock absorber connected directly to the swingarm also supplies 147 mm of suspension travel at the rear wheel.


Both at the front and rear, state-of-the-art hydraulic disc brakes from FORMULA ensure best possible retardation. The exclusive, self-cleaning Wave brake discs stand for the ultimate in race technology and outstanding safety.

Sometimes less can mean more! O and Z-rings have been dispensed with completely on this chain specially developed for motocross use. That and the special construction of the bearing bushes result in the perfect compromise between durability and minimum power loss.

Grip Set
The KTM 2K (2K= 2 different materials) grip combines the durability of KTM standard grips and the comfort of the soft KTM grips.
  • Harder orange material on the inside and at the grip ends for a long service life
  • Softer black material on the outside, where the hand lies on the grip, for increased comfort
  • With open grip ends for closed handguards or bar ends