KICK-START YOUR RACING CAREER.
2020 KTM 125 SX:
The KTM 125 SX is the most compact and lightweight of the full-size bikes and delivers a confidence-inspiring ride like no other. A lightweight chassis teams up with the most competitive 125 cc 2-stroke engine in its class, delivering superior agility and power to fulfil the demands of any young adrenaline seeker. This 2-stroke screamer is the ultimate entry point into the pro ranks and a sure-fire way to add to the trophy collection.
2020 KTM 125 SX Totalmotorcycle.com Key Features
NEW graphics for a READY TO RACE appearance.
NEW WP XACT front fork setting for improved damping, and new fork piston for improved
performance. Features proven, sophisticated air spring design and separate damping
NEW WP XACT rear shock setting and new compression adjuster for improved tuning.
NEW front sprocket fixation uses screw and diaphragm spring instead of circlip.
Reworked reeds for intake block offer improved function for better sealing and performance.
Reworked kickstart intermediate gear for improved durability.
High-tech, lightweight chrome-moly steel frame with optimized stiffness provides a great
blend of comfort and stability.
Single-piece cast aluminum swingarm features a long rear axle slot for increased
adjustability, offering better straight-line stability.
Lightweight die-cast engine cases feature a high crankshaft position located close to the
center of gravity for optimal mass centralization.
38 mm flat slide carburetor provides smooth and controllable power delivery and guarantees
optimal performance over the entire range.
Bodywork features a slim design for optimal comfort, control and freedom of movement.
Air box and air boot designed to provide maximum protection of the air filter against soiling
and better airflow for optimal performance. Air filter can be accessed without tools for quick
Hydraulic Brembo clutch system offers light operation and highly controllable modulation of
High-tech Brembo brakes have always been standard equipment on KTM offroad bikes and
are combined with lightweight Wave discs.
Handlebar clamps feature a separated lower clamp and bridge-type upper clamp for more
KTM’s “No Dirt” foot peg design keeps the peg pivot from becoming clogged, ensuring the
foot peg is always in the correct position.
Super lightweight Galfer Wave rotors, CNC machined hubs, high-end Excel rims and Dunlop
MX 3S tires.
“No Dirt” shift lever prevents dirt from fouling the lever joint to ensure proper shifting in any
THE NEW KTM SX RANGE IS OUT NOW!
After the race is before the race and when it comes to competing in the most prestigious championships around the world, this mantra is an important one to live by. KTM’s desire to win in AMA Supercross and the FIM Motocross World Championship continues to be demonstrated with outstanding performances in each series thanks to KTM’s focus on creating the sharpest weapons for the toughest battles. This READY TO RACE mindset and development in the most challenging arenas is translated directly into our serial production models.
Following on from last year’s ground-breaking introduction of a new KTM SX generation, for model year 2020 the 2-stroke KTM 125 SX, KTM 150 SX and KTM 250 SX, and the 4-stroke KTM 250 SX-F, KTM 350 SX-F and KTM 450 SX-F have received performance enhancing engine updates to ensure they remain at the fore and as battle-ready as ever. These detailed refinements, that have been developed with KTM´s test riders in Europe and the USA along with factory racers around the globe, complement the high-quality serial components that the KTM SX range already boasts.
New graphics and colors give the range a fresh look for the new season, while an E-starter and a map select switch with integrated traction control and launch control on 4-stroke machines, premium brakes supplied by Brembo, No-Dirt footpegs are fitted as standard to KTM’s class-leading line-up. High quality exhaust systems, plastics and seats join the reworked WP XACT suspension with the proven AER technology, which offers enhanced handling for model year 2020.
Designed by the very same engineers that are responsible for the bikes raced by the likes of Jeffrey Herlings, Antonio Cairoli and Cooper Webb, the KTM sportminicycle line-up continues to set the benchmark in out-of-the-crate performance for junior riders. For MY2020 the KTM 50 SX, KTM 65 SX and KTM 85 SX have a new look and feature the WP XACT suspension for precise handling and stability in the toughest motocross terrain.
All of the junior models boast premium components such as high-quality Formula brakes, a high-strength steel frame, ergonomically designed bodywork and high-performance engines. For model year 2020 the KTM 65 SX has a reworked ignition curve for improved performance, while the carburetor has been optimized for better power delivery. Its bigger brother, the KTM 85 SX, has a new transmission drive shaft fixing for safer sprocket fixation. The KTM 85 SX also has a reworked muffler with improved packing wool, which saves weight.
In addition, the KTM SX-E 5 will join the sportminicycles as another competitive option for junior riders. Based on the KTM 50 SX with its high-end chassis, but powered by an electric motor, the KTM SX-E 5 is easy to ride, has zero emissions, low noise and requires minimal maintenance – giving riders more options for places to ride, whilst being easy to use. The height of the bike is also completely adjustable, and it is aimed at riders aged from 4 to 10 years old, making it an exciting new model in the KTM line-up. The KTM SX-E 5 will be launched this summer.
“To be the consistent performer at any level of racing, you have to continue to progress in development. The work never stops – whether that’s here in Mattighofen, or with our engineers in the USA. The KTM SX range model year 2020 has received a number of updates to complement last year’s groundbreaking new generation models, and we can see that our continued efforts in development are paying off – our athletes both in Supercross and Motocross have enjoyed some fantastic results so far this season. Utilizing the same R&D team as their bigger brothers, the KTM sportminicycle models remain at the very forefront of junior racing competition with detailed refinements for MY2020. In addition, we are excited for the highly anticipated launch of the all-new KTM SX-E 5 electric minicycle, which will arrive this summer,” said KTM´s Senior Product Manager Offroad, Joachim Sauer.
2020 KTM 125 SX Totalmotorcycle.com Features and Benefits
ENGINE & EXHAUST
KTM 2-strokes have been tearing up MX tracks for decades and are undoubtedly the fastest on the track today. Thanks to years of ongoing development, these engines are the benchmark in performance and technology, with the perfect combination of power, weight and control. For 2020, small, but important refinements have been made, resulting in improved power delivery and reliability and through its melodic high-RPM screams, KTM 125 SX continues to deliver thrilling high-performance harmonics.
To cater for the highly energized riding style of a 125 cc 2-stroke rider, KTM developed a chassis that delivers on their demanding expectations. The lightweight, high-tech steel frame is designed to respond instantly to rider input and provide accurate rider feedback. The flex characteristics help the bike to soak up those big hits while also delivering excellent agility and high-speed stability. For 2020, the suspension features improved damping characteristics. The reworked settings offer a slightly softer, more comfortable feel that, together with the frame, allows the rider to be 100% in charge of the ride.
ERGONOMICS & COMFORT
Momentum is crucial when laying down fast laps on a 125 cc. The ability to shift your weight quickly and easily to move in harmony with the motorcycle is key to maximizing flow. KTM focused extensively on the optimal ergonomics for high-level performance, ensuring a riding position that offers the best control and, with the option of several handlebar positions, can be adjusted to suit every rider and condition. The way a rider interacts with the bodywork, seat, footpegs and handlebars achieves balance and control. For this reason, no compromises were made in these important areas and only the best quality products and designs were used. Sitting on the 2020 KTM 125 SX gives the rider a definite sense of control and this is immediately confirmed the moment he hits the track.
BODYWORK & GRAPHICS
125 cc riders are renowned for riding with the most aggressive body language. Young, determined athletes riding with exaggerated style, pushing themselves and their machines to the limit. This was a critical consideration when developing the bodywork of the KTM 125 SX and was factored into the entire SX range. By using input from KTM factory riders, KTM R&D as well as Kiska Design, the bodywork of the KTM 125 SX achieves complete harmony between rider and bike. The main goal was to provide the perfect contact points for the rider, allowing him to move as freely as his spirit demands, with the control to match his intentions. The bodywork is full of intelligent design elements, like the I-beam structure on the front and rear fenders, which guarantee maximum stability with the lowest possible weight.
SOFTWARE & ELECTRONICS
Absolute performance purity is the name of the game when it comes to the KTM 125 SX. Undiluted 2-stroke simplicity with an hour meter to keep a check on how long you’ve been shredding and an optional rev counter to assist with perfect setup.
2020 KTM 125 SX – Totalmotorcycle.com International Specifications/Technical Details
US MSRP Price: $7,299 USD
Canada MSRP Price: $ See Dealer for Pricing in CDN
Europe/UK MSRP Price: £ See Dealer for Pricing in GBP (On The Road inc 20% Vat)
Australia MSRP Price: See Dealer for Pricing in AU
Engine Type: Single Cylinder, 2-Stroke
Displacement: 124.8 cc
Bore / Stroke: 54 / 54.5 mm
Transmission: 6 Gears
Fuel System: Mikuni TMX 38
Lubrication: Premix 40:1
Primary Ratio: 23:73
Final Drive: 13:50
Cooling: Liquid Cooling
Clutch: Wet Multi-Disc DS Clutch, Brembo Hydraulics
Frame: Central Double-Cradle Type 25CrMo4 Steel
Sub Frame: Aluminum
Handle bar: Neken, Aluminum Ø 28/22 mm
Front Suspension: WP XACT USD Fork, Ø 48 mm
Rear Suspension: WP XACT Monoshock with Linkage
Suspension Travel Front/Rear: 310 mm / 12.2 in; 300 mm / 11.81 in
Front/Rear Brakes: Disc Brake 260 mm / 10.24 in; 220 mm / 8.66 in
Front/Rear Rims: 1.60x 21” / 2.15 x 19” Excel
Front/Rear Tires: 80/100-21” / 100/90-19” Dunlop MX 3S
Chain: 5/8 x 1/4 in
Steering Head Angle: 26.1º
Triple Clamp Offset: 22 mm
Wheelbase: 1,485 mm ± 10 mm / 58.5 ± 0.4 in
Ground Clearance: 375 mm / 14.8 in
Seat Height: 950 mm / 37.4 in
Tank Capacity, Approx: 7.5 L / 1.98 gal
Weight (without fuel), Approx: 87.5 kg / 192.9 lbs
Manufacturer Specifications and appearance are subject to change without prior notice on Total Motorcycle (TMW).