Motocross Bikes
2021KTM 250 SX
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The 2021 KTM 250 SX is a lightweight two-stroke motocross bike designed for intermediate to advanced riders seeking competitive performance. Known for its aggressive power delivery and nimble handling characteristics, it excels in tight track sections and technical terrain. The liquid-cooled 249cc engine and robust steel frame make it a reliable choice for both weekend racers and serious competitors.
- Capacity
- 249.0 ccm
- Engine
- Single, two-stroke
- Gearbox
- 5-speed
- Dry weight
- 87.5 kg
- Seat height
- 950 mm
- Power
- 24.9 HP (18.3 kW)
What’s new for the 2021 KTM 250 SX
vs the 2020| Spec | 2020 | 2021 |
|---|---|---|
| Dry weight | 95.5 kg (210.5 pounds) | 87.5 kg (192.9 pounds) |
| Front brakes | Single disc. Four-piston calipers. | Single disc |
| Rear brakes | Single disc. Two-piston calipers. | Single disc |
Other years
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How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Built purely for motocross track riding and racing, not for street use or general transportation.
- Built for
- Sharp, explosive, and razor-agile, this bike rewards aggressive riding and precise throttle control with rapid acceleration bursts and flickable handling.
- Not ideal for
- This is not suitable for commuting, touring, carrying passengers, or riders seeking a comfortable, low-maintenance everyday motorcycle.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Will it fit you?
Worked out in your browser - nothing is sent to usEngine
- Capacity
- 249.0 ccm
- Power
- 24.9 HP (18.3 kW)
- Engine type
- Single, two-stroke
- Power/weight ratio
- 0.2846 HP/kg (dry)
- Bore x stroke
- 66.4 x 72.0 mm
- Cooling system
- Liquid
- Fuel system
- Carburettor
- Starting
- Kick
- Ignition
- Kokusan EMS.
- Lubrication system
- Mixture oil lubrication 1:60
Transmission
- Gearbox
- 5-speed
- Transmission type
- Manual
- Final drive
- Chain
- Clutch
- Wet, DDS multi-disc clutch, Brembo hydraulics
Dimensions & weight
- Wheelbase
- 1495 mm
- Seat height
- 950 mm
- Dry weight
- 87.5 kg
- Fuel capacity
- 7.50 litres
- Ground clearance
- 375 mm
Chassis & suspension
- Frame
- Chrome-molybdenum steel central-tube
- Front suspension
- WP XACT-USD, Ø 48 mm
- Rear suspension
- WP XACT Monoshock with linkage
- Front wheel travel
- 310 mm
- Rear wheel travel
- 300 mm
- Rake (fork angle)
- 26.5°
- Trail
- 116 mm
Brakes & wheels
- Front brakes
- Single disc
- Front brakes diameter
- 260 mm
- Rear brakes
- Single disc
- Rear brakes diameter
- 220 mm
- Front tyre
- 80/100-21
- Rear tyre
- 110/90-19
Other
- Color options
- Orange/white/black
Specs last verified against published sources: .
Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.
What changed, year to year
Differences highlighted| Specification | 2000 | 2007 | 2014 | 2020 | 2021 | 2027 |
|---|---|---|---|---|---|---|
| Capacity | 249 cc | 249 cc | 249 cc | 249 cc | 249 cc | 249 cc |
| Dry weight | 101 kg | 98 kg | 96 kg | 96 kg | 88 kg | 96 kg |
| Seat height | 925 mm | 925 mm | 992 mm | 950 mm | 950 mm | 958 mm |
| Fuel capacity | 7.5 L | 7.5 L | 7.5 L | 7.5 L | 7.5 L | 7.2 L |
Illustrative - generated automatically by diffing the year records already on file, not a manufacturer-published changelog.
Rider Reviews
Common questions
What is the engine size of the KTM 250 SX?
The 2021 KTM 250 SX has a Capacity of 249.0 ccm (15.19 cubic inches).
What engine power does the KTM 250 SX have?
The 2021 KTM 250 SX has a Power of 24.9 HP (18.3 kW).
How many gears does the KTM 250 SX have?
The 2021 KTM 250 SX has a Gearbox of 5-speed.
How much does the KTM 250 SX weigh?
The 2021 KTM 250 SX has a Dry weight of 87.5 kg (192.9 pounds).
Shop this bike
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The 2021 KTM 250 SX is a powerful and agile motocross bike that delivers top-notch performance on the track. With its lightweight chassis and powerful 2-stroke engine, this bike offers impressive acceleration and handling. The updated suspension and frame design provide excellent stability and control, making it an ideal choice for riders looking to push their limits.
Overall, the 2021 KTM 250 SX is a fantastic motocross bike that delivers on both power and precision. Its impressive performance and handling make it a top contender in the 250cc class. Whether you're a seasoned racer or a weekend warrior, this bike is sure to impress with its speed, agility, and durability. With its sleek design and top-notch performance, the 2021 KTM 250 SX is a standout choice for motocross enthusiasts.
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