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KTM 125 SX
2021Off-road

KTM 125 SX

$7,399

Key specifications

Engine
125 cc
Power
15 HP
Weight
88 kg
Fuel type
petrol
Fuel capacity
2.0 L
Transmission
6-speed
Seat height
34 mm
Front brakes
Single disc
Rear brakes
Single disc

Overview

Introducing the 2021 KTM 125 SX, a formidable contender in the enduro-offroad category that blends lightweight agility with high-performance engineering. Priced at an MSRP of US$ 7,399, this motorcycle is tailored for both aspiring riders and seasoned competitors who crave an exhilarating experience on the trails. KTM’s legacy in offroad racing is epitomized in the 125 SX, which showcases the brand's commitment to performance, durability, and cutting-edge technology—all designed to dominate the dirt. At the heart of the 125 SX is a potent 124.8 ccm single-cylinder, two-stroke engine that produces a spirited 15 HP (10.9 kW). This powerplant, featuring a precise fuel injection system and advanced Kokusan EMS ignition, delivers impressive throttle response and exhilarating acceleration. The 6-speed gearbox, complemented by a Brembo hydraulic multi-plate clutch, ensures smooth power delivery and seamless gear shifts, allowing riders to navigate through challenging terrains with confidence. With a lightweight design tipping the scales at just 87.5 kg (192.9 pounds), the 125 SX offers an exceptional power-to-weight ratio, enabling riders to tackle obstacles and curves with remarkable agility. The 2021 KTM 125 SX isn’t just about brute force; it’s equipped with advanced suspension and chassis technology that enhances both comfort and control. The central double-cradle frame, constructed from robust 25CrMo4 steel, provides unparalleled stability, while the WP XACT suspension system—featuring a 48 mm front fork and a linked monoshock rear—offers 310 mm of front travel and 300 mm of rear travel, ensuring that the bike soaks up bumps with ease. Additionally, the bike’s impressive ground clearance of 375 mm (14.8 inches) allows riders to traverse rocky trails without worry. Whether you’re a novice rider or a seasoned

Pros

  • Lightweight Agility: Weighing just 87.5 kg, the 125 SX is easy to maneuver, making it ideal for both beginners and experienced riders.
  • Powerful Engine: The potent two-stroke engine delivers impressive acceleration and throttle response, perfect for competitive riding.
  • Advanced Suspension: The WP XACT suspension system provides excellent handling and comfort over rough terrain, enhancing the overall riding experience.

Cons

  • Limited Power for Advanced Riders: While great for beginners, more experienced riders may find the 125cc engine lacks the power needed for high-speed racing.
  • Kick Starter Only: The absence of an electric start may be less convenient for some riders, especially in challenging conditions.
  • Height for Shorter Riders: With a seat height of 850 mm (33.5 inches), it may be a stretch for shorter riders, potentially affecting their confidence and control.

Technical details

Source specification data

Make
KTM
Model
125 SX
Price
S
$ 7399.
P
depends on country, taxes, accessories, etc.
Category
Enduro-offroad
Starter
Kick
Color Options
White/orange
Power
15.0 HP (10.9 kW))
Clutch
Multi-plate clutch, Brembo hydraulics
Gearbox
6-speed
Ignition
Kokusan EMS
Driveline
O Ring
.
Primary
drive: 22:72.
Fuel System
Injection
Bore X Stroke
54.0 x 54.5 mm (2.1 x 2.1 inches)
Displacement
124.8 ccm (7.62 cubic inches)
Cooling System
Liquid
Engine Details
Single cylinder, two-stroke
Lubrication System
Wet sump
Transmission Type Final Drive
Chain
Dry Weight
87.5 kg (192.9 pounds)
Seat Height
850 mm (33.5 inches) If adjustable, lowest setting.
Fuel Capacity
7.50 litres (1.98 gallons)
Ground Clearance
375 mm (14.8 inches)
Power Weight Ratio
0.1714 HP/kg
Rake
26.1°
Rear Tyre
150-17
Frame Type
Central
double-cradle-type 25
Mo4
steel
Front Tyre
110-17
Rear Brakes
Single disc
Front Brakes
Single disc
Rear Suspension
WP XACT Monoshock with linkage
Front Suspension
WP XACT-USD, Ø 48 mm
Rear Wheel Travel
300 mm (11.8 inches)
Front Wheel Travel
310 mm (12.2 inches)

Available colors

White/orange