2026 KTM 125 SX

There are very few sounds that can't be beaten: the crack of a soda can on a blistering hot day, the ping of the perfectly executed golf shot, and the scream of a 125 cc 2-stroke full throttle. The KTM 125 SX takes its leads directly from the KTM Factory Racing team for pure performance, pure results. Like the sound it makes, you won't forget it.

Specifications

Engine

• Design: 1-cylinder, 2-stroke engine

• Displacement: 124.8 cm³

• Transmission: 6-speed

• Fuel System: Keihin EFI, 39 mm throttle body

• EMS: Vitesco Technologies EMS

• Primary Drive: 23:73

• Clutch Primary Drive Teeth: 73

• Clutch Type: DS multi-disc wet clutch

• Clutch Operation: Brembo hydraulics

• Cylinder: Single cylinder

• Stroke: 2-stroke

Chassis

• Frame Design: Central double-cradle-type 25CrMo4 steel

• Rear Subframe: Aluminum-reinforced polyamide

• Front Brake: Disc brake

• Rear Brake: Disc brake

• Chain: 520, non-sealed

Suspension

• Front Suspension: WP XACT-USD (AER), Ø 48 mm

• Rear Suspension: WP XACT Monoshock with linkage

• Front Suspension Travel: 310 mm

• Rear Suspension Travel: 300 mm

• Front Suspension Adjustment: Compression (high & low speed), rebound

• Rear Suspension Adjustment: Compression & rebound adjustable

Dimensions

• Seat Height: 958 mm

• Ground Clearance: 359 mm

• Tank Capacity: 7.2 L (approx.)