KTM  125 SX

125 SX
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The new KTM 125 SX is the most compact and lightweight of the full-size bikes and delivers a confidence-inspiring ride like no other. A new lightweight chassis teams up with the most competitive 125cc 2-stroke engine to date, delivering superior agility and power to fulfil the demands of any young adrenalin 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.

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Design 1-cylinder 2-stroke engine, water-cooled, with reed intake and exhaust control
Displacement 124.8 cm³ (7.616 cu in)
Bore 54 mm (2.13 in)
Stroke 54.5 mm (2.146 in)
Starting aid Kickstarter
Transmission 6 gear, claw shifted
Primary gear 23:73
Final drive 13:50
Clutch Wet multi-disc clutch / Brembo hydraulics
Ignition system Contactless, controlled, fully electronic ignition system with digital ignition timing adjustment, type Kokusan


Frame Central tube frame made of chrome molybdenum steel tubing
Forks WP-USD, AER 48, Ø 48 mm
Shock absorber WP shock absorber with linkage
Suspension travel Front 310 mm
Suspension travel Rear 300 mm
Brake system Disc brakes, brake calipers on floating bearings
Brake discs - diameter Front 260 mm (10.24 in)
Brake discs - diameter Rear 220 mm (8.66 in)
Chain 5/8 x 1/4"
Steering head angle 63.9°
Wheel base 1,485±10 mm
Ground clearance (unloaded) 375 mm
Seat height (unloaded) 960 mm
Total fuel tank capacity approx. 7 l
Unleaded premium fuel, mixed with 2-stroke engine oil (1:40)
Weight without fuel approx. 87.2 kg