14 August. Friday 2026
KTM 125 SX - 2025 Specifications and Reviews
The 2025 KTM 125 SX is a lightweight two-stroke offroad machine designed for young riders and beginners entering competitive motocross. Known for its agile handling and responsive 15 hp engine, it delivers an engaging platform for learning fundamental riding skills. The fuel-injected single-cylinder powerplant provides crisp power delivery and reliability across varying track conditions.
General information | |
| Color Options | Orange/black/grey |
| Category | Enduro / offroad |
| Model | KTM 125 SX |
| | |
Engine and Transmission Specifications | |
| Starting | Electric |
| Clutch | Wet multi-disc DS clutch, Brembo hydraulics |
| Final Drive | Chain (final drive) |
| Gearbox | 6-speed |
| Cooling System | Liquid |
| Ignition | Vitesco Technologies EMS |
| Induction | Injection. Keihin EFI, throttle body 39 mm |
| Bore x Stroke | 54.0 x 54.5 mm (2.1 x 2.1 inches) |
| Max Power | 15.0 HP (10.9 kW)) |
| Capacity: | 124.8 ccm (7.62 cubic inches) |
Physical measures and capacities | |
| Fuel Capacity | 7.20 litres (1.90 US gallons) |
| Wheelbase | 1493 mm (58.8 inches) |
| Ground Clearance | 359 mm (14.1 inches) |
| Seat Height | 958 mm (37.7 inches) If adjustable, lowest setting. |
| Power/Weight Ratio | 0.1623 HP/kg |
| Dry Weight | 92.4 kg (203.7 pounds) |
KTM 125 SX dimensions and frame | |
| Wheels | Spoked wheels with aluminium rims |
| Rear Brakes | Single disc |
| Brake Disc Diameter | 220 mm (8.7 inches) |
| Front Brakes | Single disc |
| Rear Tyre | 2.15-19 |
| Front Tyre | 1.6-21 |
| Rear Wheel Travel | 300 mm (11.8 inches) |
| Rear Suspension | WP XACT Monoshock with linkage |
| Front Wheel Travel | 310 mm (12.2 inches) |
| Front Suspension | WP XACT-USD, Ø 48 mm |
| Frame | Central double-cradle-type 25CrMo4 steel. Aluminum-reinforced polyamide subframe. |
| | |
Other specs | |
| Maintenance | Find parts, fluids, filters, maintenance tools and service items on eBay |
| Update specs | Report missing specs or required updates. |
| Rake (fork angle) | 26.1° |
| Exhaust system | Aluminum |
| Driveline | 520, Non-sealed chain |
| Lubrication system | Wet sump |
| Engine type | Single cylinder, two-stroke |
| Model year | 2025 |
Performance Profile & Rider Fit
Best For
Track95%
City10%
Cornering90%
Daily Riding10%
Touring8%
Passenger5%
Rider Profile
| Best For | This is a full-on motocross competition bike best suited to intermediate through expert off-road riders, not beginners or casual road riders. |
| Purpose | Built purely for closed-course motocross racing, it excels at jumps, berms, and rapid direction changes on dirt tracks rather than any street use. |
| Rider Fit | The tall 958 mm seat height, aggressive ergonomics, and demanding 2-stroke power delivery require good rider fitness, strength, and prior dirt bike experience. |
| Character | Light, explosive, and razor-sharp in handling, it rewards aggressive riding with a peaky two-stroke power band and minimal weight to manage. |
| Not Ideal For | It is not suitable for commuting, highway travel, passengers, or riders seeking comfort, storage, or a forgiving low-end power delivery. |
Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.
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