2021 KTM SX 125

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KTM 125 SX 2021
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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.

ENGINE
The KTM 125 SX engine is undoubtedly once again the most competitive and powerful engine in its class. With an outstanding power-to-weight ratio, low cost and overall simplicity, it is clear that 2-strokes will continue to have a successful future at KTM. The compact and durable 17.2 kg engine was developed using the latest KTM engineering know-how, resulting in broad power across the rev range. Its easy rideability and outstanding performance are benefits that equate to faster lap times and better results.

FRAME
The frame and subframe on the KTM 125 SX caters for the aggressive riding styles associated with 125 cc racing. The frame itself is professionally crafted from hydroformed chromium molybdenum steel tubes that are robot welded, ensuring the highest levels of consistent quality. The stiffness has been precisely tailored for the most dynamic handling, and works in perfect harmony with the suspension to provide nimble agility without losing high-speed stability. The frame also features no dirt footpegs, which have a simple but effective self-cleaning system that ensures the footpegs return to their original psoition, providing complete control in all conditions. All SX frames feature the same highly durable powder coating as the KTM Factory machines and come with standard frame protectors. The subframe is made from lightweight aluminum, providing rear fender stability and strong support for the rider at little extra weight.

SEAT
All KTM SX models feature a seat that perfectly matches the range's dynamic performance-oriented ergonomics. The seat cover features silicone strips that provide better feel and grip for the rider. The seat is conveniently fixed to the bike using one long, lateral screw, making it easy to handle.

DECALS
The new modern graphics portray an impressively fast and aggressive look that sends a clear message to the competitors.

Engine

  • Engine Type:
    Single-Cylinder
  • Cylinders:
    1
  • Engine Stroke:
    2-Stroke
  • Cooling:
    Liquid
  • Valve Configuration:
    Reed Valve
  • Bore (mm):
    54
  • Bore (in):
    2.13
  • Stroke (mm):
    54.5
  • Stroke (in):
    2.15
  • Displacement (cc):
    124.8
  • Displacement (ci):
    7.6
  • Starter:
    Kick
  • Fuel Requirements:
    Premium
  • Fuel Type:
    Gas / Oil Premix

Brakes

  • Brake Brand Name:
    Brembo®
  • Front Brake Type:
    Hydraulic Disc
  • Front Brake Diameter (in):
    10.2
  • Front Brake Diameter (mm):
    260
  • Rear Brake Type:
    Hydraulic Disc
  • Rear Brake Diameter (in):
    8.7
  • Rear Brake Diameter (mm):
    220

Carburetion

  • Carburetion Brand:
    Mikuni
  • Carburetor:
    Yes
  • Number Of Carburetors:
    1
  • Carburetor Size (mm):
    38
  • Carburetion Type:
    Carburetor

Dimensions

  • Wheelbase (in):
    58.5
  • Wheelbase (mm):
    1485
  • Ground Clearance (in):
    14.8
  • Ground Clearance (mm):
    375

Other

  • Fuel Capacity (gal):
    2
  • Fuel Capacity (l):
    7.5
  • Previous Model Year Accessories:
    Yes
  • Frame:
    Chromium Molybdenum
  • Body Material:
    Plastic
  • Radiator Cover:
    Yes
  • Chain Guard:
    Yes
  • Fork Guards:
    Yes
  • Exhaust Guard:
    Yes
  • Foot Peg Location:
    Driver
  • Front Suspension Type:
    Inverted Fork
  • Front Suspension Size (in):
    1.9
  • Front Suspension Size (mm):
    48
  • Front Travel (in):
    12.2
  • Front Travel (mm):
    310
  • Front Adjustable Fork Pre-Load:
    Yes
  • Front Adjustable Rebound Damping:
    Yes
  • Front Suspension Brand Name:
    WP XACT
  • SysModelID:
    106928
  • MfrModelID:
    125 SX
  • Year:
    2021
  • Manufacturer:
    KTM
  • Model Name:
    SX
  • Trim Name:
    125
  • Family Name:
    SX
  • Product Type:
    Motorcycle / Scooter
  • Manufacturer Type:
    MX
  • Generic Type (Primary):
    Off-Road
  • Manufacturer Country:
    Austria
  • Photo Name:
    2021_KTM_SX_125.jpg
  • Major Revision Year:
    2019
  • Revision Status:
    Carryover
  • Competitor Code:
    MOT21OAE000
  • Manufacturer Recommend Minimum Age:
    16
  • SysTrimId:
    327621
  • SysMakeId:
    21
  • IsCurrent:
    Yes
  • Historical ID:
    290629
  • Data Provider:
    CRS
  • Parent Company:
    KTM
  • Display Name:
    125 SX
  • Engine Displacement to Weight (cc):
    0.65
  • MSRP:
    7399
  • Currency:
    US Dollars
  • Warranty (Months):
    1
  • Destination Charge:
    450
  • MSRP + Destination:
    7849
  • Warranty (Condition):
    Limited
  • Rear Suspension Type:
    Twin Sided Swing Arm
  • Rear Travel (in):
    11.8
  • Rear Travel (mm):
    300
  • Rear Adjustable Shock / Spring Pre-Load:
    Yes
  • Rear Adjustable Rebound Damping:
    Yes
  • Number Rear Shock Absorbers:
    1
  • Rear Suspension Brand Name:
    WP XACT
  • Rear Suspension Material:
    Aluminum
  • Seat Type:
    One-Piece
  • Adjustable:
    Yes
  • Seat Material:
    Vinyl
  • Seat Location:
    Driver
  • Seat Height (in):
    33.5
  • Seat Height (mm):
    850
  • Number Of Seats:
    1
  • Stand Type:
    Kick
  • Steering Control:
    Handlebar
  • Top Crown Material:
    Aluminum
  • Tire Brand:
    Dunlop®
  • Front Tire Width:
    80
  • Front Tire Aspect Ratio:
    100
  • Front Tire Speed Rating:
    M
  • Front Wheel Diameter:
    21
  • Rear Tire Width:
    100
  • Rear Tire Aspect Ratio:
    90
  • Rear Tire Speed Rating:
    M
  • Rear Wheel Diameter:
    19
  • Front Tire (Full Spec):
    Dunlop® GEOMAX MX3S 80/100 R21 51M
  • Rear Tire (Full Spec):
    Dunlop® GEOMAX MX3S 100/90 R19 57M
  • Wheels Composition:
    Aluminum
  • Tube / Tubeless:
    Tubed
  • Front Wheel Width (in):
    1.6
  • Rear Wheel Width (in):
    2.15

Our Location


Yamaha Triumph KTM of Camp Hill
3809 Hartzdale Dr.
Camp Hill, PA 17011