The KTM 125 SX motorcycle specifications include a 124.8 cc (7.62 cu in) engine, a 5-speed gearbox, and a listed weight of 93.6 kg (206.4 lb).
Key specifications
2003-2023Model years
125 ccDisplacement
93.6 kgDry weight
925 mmSeat height
7.5 LFuel tank
1,461 mmWheelbase
390 mmGround clearance
Model years covered
200320042005200620072008200920102011201220132014201520162017201820192020202120222023
Year-specific specification changes
The 2003 model is treated as the standard specification. Only later model years with a different supplied value are shown below.
Dry weight
2005200792.4 kg (203.7 lb)
2008201090.8 kg (200.2 lb)
201188.8 kg (195.8 lb)
201291.6 kg (201.9 lb)
2013201590.8 kg (200.2 lb)
201687.8 kg (193.6 lb)
2017201887.2 kg (192.2 lb)
201987.5 kg (192.9 lb)
2020137 kg (302 lb)
2021202287.5 kg (192.9 lb)
202392.4 kg (203.7 lb)
Front brakes
2013Single disc. Four-piston calipers.
20142019Single disc. Brake calipers on floating bearings
Front tire
20202022110-17
20231.6-21
Fuel system
20052010Carburettor. Keihin PWK 39
20112012Carburettor. Keihin PWK 38S AG
20172019Carburettor. Mikuni TMX
20202023Injection
Gearbox
200620236-speed
Rear brakes
2013Single disc. Two-piston calipers.
20142019Single disc. Brake calipers on floating bearings
Rear tire
20202022150-17
20232.15-19
Wheelbase
200420061,471 mm (57.9 inches)
20071,417 mm (55.8 inches)
200820101,471 mm (57.9 inches)
201120151,480 mm (58.3 inches)
201620191,485 mm (58.5 inches)
Front wheel travel
2007115 mm (4.5 inches)
2011185 mm (7.3 inches)
2013205 mm (8.1 inches)
2019310 mm (12.2 inches)
20212023310 mm (12.2 inches)
Fuel capacity
200920108.00 L (2.11 US gal)
201620187.00 L (1.85 US gal)
20237.20 L (1.90 US gal)
Ground clearance
2011385 mm (15.2 inches)
20122015395 mm (15.6 inches)
20162019375 mm (14.8 inches)
20212022375 mm (14.8 inches)
2023359 mm (14.1 inches)
Rear wheel travel
2007185 mm (7.3 inches)
2011185 mm (7.3 inches)
2012330 mm (13.0 inches)
2013185 mm (7.3 inches)
20142015317 mm (12.5 inches)
20162019300 mm (11.8 inches)
2020150 mm (5.9 inches)
20212023300 mm (11.8 inches)
Seat height
2008960 mm (37.8 inches)
20092010985 mm (38.8 inches)
20112015992 mm (39.1 inches)
20162018960 mm (37.8 inches)
2019950 mm (37.4 inches)
2021850 mm (33.5 inches)
2022950 mm (37.4 inches)
2023958 mm (37.7 inches)
Additional useful specifications
| Front tire size | 80/100-21 |
|---|---|
| Rear tire size | 100/90-19 |
| Front tire width | 80 mm |
| Front tire aspect ratio | 100% |
| Front rim diameter | 21 in |
| Rear tire width | 100 mm |
| Rear tire aspect ratio | 90% |
| Rear rim diameter | 19 in |
| Bore/stroke ratio | 0.99:1 (Square) |
Engine specifications
| Engine type | Single cylinder, two-stroke |
|---|---|
| Displacement | 124.8 cc (7.62 cu in) |
| Bore × stroke | 54.0 x 54.5 mm (2.1 x 2.1 inches) |
| Cooling system | Liquid |
| Fuel system | Carburettor |
Transmission and drivetrain
| Gearbox | 5-speed |
|---|---|
| Final drive | Chain (final drive) |
Chassis and suspension
| Front wheel travel | 300 mm (11.8 inches) |
|---|---|
| Rear wheel travel | 335 mm (13.2 inches) |
Brakes, wheels and tires
| Front brakes | Single disc |
|---|---|
| Rear brakes | Single disc |
| Front tire | 80/100-21 |
| Rear tire | 100/90-19 |
Dimensions and weight
| Dry weight | 93.6 kg (206.4 lb) |
|---|---|
| Seat height | 925 mm (36.4 inches) |
| Wheelbase | 1,461 mm (57.5 inches) |
| Ground clearance | 390 mm (15.4 inches) |
Fuel and emissions
| Fuel capacity | 7.50 L (1.98 US gal) |
|---|
Disclaimer: Specifications may vary by market, trim, production date and optional equipment, and scraped or historical data can contain errors. Comparison and percentile values are calculated from KTM models in this specifications database. Always double-check important specifications against the motorcycle owner’s/service manual and official KTM information before relying on them. Visit the official KTM website.