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KTM 125 SX

2024 KTM 125 SX Top Speed, Specs, Mileage, & Price

The KTM 125 SX is one of the lightest and most compact full-size motocross bikes from KTM. It has been updated for the year 2024 with a new graphics set that looks very attractive. This motocrosser comes with a 125cc 2-stroke engine and a robust 6-speed gearbox. The KTM 125 is very lightweight and comes with a powerful engine which helps it deliver amazing performance. It is available in only one color option like the KTM 450 SX-F and its price in the United States starts at $ 7,499 USD.

KTM 125 SX Top Speed, Specifications, Images, & Price

KTM 125 SX Key Specifications

Price$ 7,499
Engine 1-Cylinder
Transmission 6-Speed
Power37.5 HP
Seat Height950 mm
Dry Weight87.5 kg
Fuel tank Capacity7.5 liters

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Top Features

  • Central Double Cradle Type 25 CrMo4 Steel Frame
  • Lightweight Polyethylene Fuel Tank
  • Gravity Die-Cast Swingarm
  • WP XACT 48 mm Upside Down Front Forks
  • WP XACT Mono-Shock with Linkage
  • High Quality CNC Machined Tripple Clamps
  • NEKEN Aluminium Tapered Handlebar
  • Front and Rear High Tech Brembo Brakes
  • Lightweigh CNC Machined Wheels
  • Dunlop Geomax MX33 Tires
  • Self Cleaning No-Dirt Foot Pegs
  • Single-Cylinder Two-Stroke Engine
  • Kokusan Engine Management System
  • 6-Speed Transmission
  • Wet Multi-Plate DS Clutch with Brembo Hydraulics
  • Mikuni TMX Carbuerettor

KTM 125 SX Review

The KTM 125 SX comes packed with a 124.8cc single-cylinder, two-stroke engine that uses two radiators for cooling. The fuel supply relies on a Mikuni TMX carburetor and it features a robust 6-speed gearbox like the KTM 65 SX. This motocross uses a Kokusan engine management system that delivers smooth and crisp power. The 6-speed gearbox works smoothly in tandem with a wet multi-plate DS clutch with Brembo hydraulics. The KTM 125 SX top speed is nearly 85 mph in full stock conditions. Its lightweight and compact engine is capable of delivering championship-winning performance.

KTM 125 SX top speed

The latest model comes in Red Bull KTM factory racing colors and graphics. The KTM 125 SX features a central double-cradle CrMo frame with a gravity die-cast swingarm. This motocross sports 48 mm WP XACT inverted forks at the front and a WP XACT mono-shock suspension at the rear. Braking power comes from a 260 mm disc brake on the front wheel and a 220 mm disc brake on the rear wheel. The KTM 125 SX comes with a 21-inch front wheel and 19 inch rear wheel. It has a dry weight of 87.5 kg and a fuel tank capacity of 7.5 liters.

KTM 125 SX Price in the USA

The price of KTM 125 SX in the USA starts at $ 7,499 USD. This KTM motocrosser competes against the Husqvarna TC125, Yamaha YZ125, and TM MX 125. One of the major competitors of this motocross in this segment is the Yamaha YZ125. The KTM 125 SX is cheaper than its sibling the Husqvarna TC125, but the Yamaha YZ125 is the most affordable one giving it a big advantage over its competitors.


  • Comes with an sporty Red Bull KTM factory edition color scheme
  • 125cc 2-stroke engine is powerful and offers great performance
  • Powerful and efficent disc brakes with Brembo callipers
  • Long travel front and rear suspension


  • Competitors are priced lower
  • Available in only one color

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KTM 125 SX Specifications

Engine & Transmission

Engine TypeSingle-Cylinder, 2-Stroke
Engine Displacement124.8cc
No. of Cylinders1
Fuel TypePetrol
Fuel SupplyMikuni TMX Carburettor
Cooling SystemTwin Radiators
Bore 54 mm
Stroke54.5 mm
Valves Per Cylinder2
Starting Kick Starter
Ignition Digital
Transmission 6-Speed
ClutchWet Multi-Plate DS Clutch
Final DriveChain

Top Speed Performance, & Mileage

Power 37.5 HP
Top SpeedKTM 125 SX Top Speed is 85 mph
Mileage20-25 km/l
0-60 mph9-10 sec

Chassis & Suspension

Body TypeMotocross
ChassisCentral Double Cradle Type Frame
Front SuspensionWP XACT 48 mm Inverted Forks
Rear Suspension WP XACT Mono-Shock with Linkage
Front Wheel Travel310 mm
Rear Wheel Travel300 mm

Brakes, Wheels, & Tires

Front BrakeSingle High Tech Brembo Disc
Rear BrakeSingle High Tech Brembo Disc
Front Brake Diameter260 mm
Rear Brake Diameter220 mm
Front Wheel21 Inch Spoke Rim
Rear Wheel19 Inch Spoke Rim
Tire TypeDunlop Geomax MX33 Tires
Front Tire Size80/100-21
Rear Tire Size100/90-19

Dimension & Capacity

Wheelbase 58.5 inches
Steering Head Angle63.9 °
Seat Height 950 mm
Ground Clearance375 mm
Dry Weight 87.5 kg
Fuel Tank Capacity7.5 liters
Seating Capacity1

Electricals & Lighting

Battery TypeMF
Battery Capacity12V
Pilot LightsNo
Taillights No
Turn Signals No
Pass LightNo

Instrument Console & Speedometer

Console TypeNo Instrument Console
Trip MeterNo
No. of Trip Meters0
Fuel GaugeNo
Gear Shift LightNo
Gear Position Indicator No
Low Fuel Indicator No
Engine Temperature IndicatorNo
Service Indicator No

Other Features

Electric StarterNo
Engine kill SwitchNo
Stand Alarm No
Stepped SeatNo
Pillion SeatNo
Pillion GrabrailsNo
Pillion Footrest No
Underseat StorageYes
Additional FeaturesRed Bull KTM Factory Racing Decals

Conclusion on KTM 125 SX

The 125 SX comes with a potent 2-stroke mill that is compact and very lightweight. Its lightweight design and high power-to-weight ratio help it deliver great performance. This KTM motocrosser uses high-quality parts and it has a solid build quality. The KTM 125 SX is definitely one of the best motocrossers in the 125cc capacity.

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