KTM 250 SX-F - 2021 Specifications and Reviews

The 2021 KTM 250 SX-F is a competitive motocross machine engineered for intermediate to advanced riders seeking aggressive performance in closed-course racing. Powered by a potent 250cc four-stroke engine with premium Brembo hydraulics and a responsive five-speed transmission, it delivers the precision handling and power delivery expected of KTM's championship-winning SX-F lineage. Best known for its sharp cornering geometry and dependable power characteristics, this bike excels in technical terrain and demanding race conditions.

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General information

CategoryCross / motocross
Year2021
ModelKTM 250 SX-F

Engine and Transmission Specifications

Driveline13:48. Primary drive: 26:72. 520 X-ring chain.
ClutchWet multi-disc clutch, Brembo hydraulics
Transmission typeChain   (final drive)
Gearbox5-speed
Cooling systemLiquid
IgnitionKeihin EMS
Bore x Stroke78.0 x 52.3 mm (3.1 x 2.1 inches)
Engine detailsReed intake
Engine typeSingle cylinder, four-stroke
Capacity:249.9 ccm (15.25 cubic inches)

Brakes, suspension, Frame and wheels

WheelsWire spoked.
Rear brakesSingle disc
Diameter260 mm (10.2 inches)
Front brakesSingle disc
Rear tire110/90-19
Front tire80/100-21
Rear wheel travel300 mm (11.8 inches)
Rear SuspensionWP XACT Monoshock with linkage
Front wheel travel310 mm (12.2 inches)
Front SuspensionWP XACT-USD, Ø 48 mm
Rake (fork angle)26.5°
Frame typeCentral double-cradle-type 25CrMo4 steel
 
 

Physical measures and capacities

Fuel capacity7.00 litres (1.85 US gallons)
Wheelbase1495 mm (58.9 inches)
Ground clearance370 mm (14.6 inches)
Seat height950 mm (37.4 inches) If adjustable, lowest setting.
Dry weight99.0 kg (218.3 pounds)

Other specs

MaintenanceFind parts, fluids, filters, maintenance tools and service items on eBay
ElectricalLithium-ion battery
StarterElectric
Color optionsOrange/white/black

Performance Profile & Rider Fit

Best For

Track90%
City10%
Cornering85%
Daily Riding10%
Touring12%
Passenger5%

Rider Profile

Best ForThis is a full-size 250cc motocross machine best suited to intermediate through expert off-road riders, not newcomers to dirt biking.
PurposeBuilt purely as a motocross competition bike for closed circuits and tracks, with sharp handling and high-performance suspension rather than everyday usability.
Rider FitThe tall 958 mm seat height, firm suspension, and lack of creature comforts demand good rider fitness, leg length, and off-road riding technique.
CharacterA lightweight, race-bred single-cylinder machine defined by aggressive acceleration, precise cornering, and razor-sharp responsiveness over rough terrain.
Not Ideal ForThis bike is not suitable for riders wanting a comfortable commuter, a passenger-friendly machine, or a long-distance touring companion.

Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.

Rider Fit Visualizer

2021 KTM 250 SX-F Rider Ergonomics Assessment

Calculated in your browser only - your height/inseam are never sent to our servers.

Feet:

At 950mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with cannot reach comfortably on the 2021 KTM 250 SX-F, with a cramped knee angle of around 85 degrees and an upright riding position.

Data quality: measured. Assumes about 30mm of suspension sag once seated (a typical street-bike rule of thumb - stiffer or softer suspension will vary). This is an approximation from category-typical geometry and generic body proportions, not a measurement of this specific bike or you - sit on it before you buy.

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Rider Reviews

Total comments: 1
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MotorcycleDB Review

The 2021 KTM 250 SX-F is a powerful and agile motocross bike that delivers impressive performance on the track. With its lightweight and nimble design, this motorcycle offers excellent handling and maneuverability, allowing riders to tackle tight corners and challenging terrain with ease. The 250cc engine provides ample power, while the advanced suspension system ensures a smooth and controlled ride. Overall, the 2021 KTM 250 SX-F is a top choice for motocross enthusiasts looking for a high-performance bike that can handle the demands of intense racing. From its sleek and aggressive design to its cutting-edge technology, the 2021 KTM 250 SX-F is a standout in the motocross market. Whether you're a seasoned rider or just getting started in the sport, this bike offers a winning combination of power, performance, and precision. With its championship-winning pedigree and impressive list of features, the 2021 KTM 250 SX-F is a top contender in its class. If you're looking for a motocross bike that can take your riding to the next level, the 2021 KTM 250 SX-F is definitely worth considering.
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