Motocross Bikes
2021KTM 450 SX-F
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The 2021 KTM 450 SX-F is a competitive four-stroke motocross bike designed for experienced riders seeking reliable performance in professional and amateur racing environments. Known for its potent 63 horsepower single-cylinder engine and precise Brembo hydraulic braking, it delivers strong acceleration and excellent handling on both tracks and natural terrain. This machine excels in high-speed racing applications where power delivery and durability are paramount.
- Capacity
- 449.3 ccm
- Engine
- Single, four-stroke
- Gearbox
- 4-speed
- Dry weight
- 100.0 kg
- Seat height
- 950 mm
- Power
- 63.0 HP (46.0 kW)
Other years
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Built for motocross racing and aggressive off-road riding on tracks and rough terrain.
- Built for
- A light, explosive, high-revving single-cylinder racer that rewards aggressive input with razor-sharp agility and jump-ready suspension.
- Not ideal for
- This bike is not suited to riders wanting a comfortable commuter, long-distance tourer, or a passenger-friendly ride.
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
- 449.3 ccm
- Power
- 63.0 HP (46.0 kW)
- Engine type
- Single, four-stroke
- Power/weight ratio
- 0.6300 HP/kg (dry)
- Bore x stroke
- 95.0 x 63.4 mm
- Compression
- 12.8:1
- Cooling system
- Liquid
- Fuel system
- Injection
- Starting
- Electric
- Ignition
- Keihin EMS
- Valves per cylinder
- 4
- Lubrication system
- Pressure circulation lubrication with two Eaton pumps
Transmission
- Gearbox
- 4-speed
- Transmission type
- Manual
- Final drive
- Chain
- Clutch
- Wet, DDS multi-disc clutch, Brembo hydraulics
Dimensions & weight
- Wheelbase
- 1485 mm
- Seat height
- 950 mm
- Dry weight
- 100.0 kg
- Fuel capacity
- 7.00 litres
- Ground clearance
- 370 mm
Chassis & suspension
- Frame
- 25CrMo4 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)
- 26.1°
Brakes & wheels
- Front brakes
- Single disc. Brake calipers on floating bearings
- Front brakes diameter
- 260 mm
- Rear brakes
- Single disc. Brake calipers on floating bearings
- Rear brakes diameter
- 220 mm
- Front tyre
- 1.6-21
- Rear tyre
- 2.15-19
Other
- Color options
- Orange/white/black
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 | 2007 | 2012 | 2016 | 2021 | 2025 |
|---|---|---|---|---|---|
| Capacity | 449 cc | 449 cc | 449 cc | 449 cc | 450 cc |
| Dry weight | 104 kg | 108 kg | 100 kg | 100 kg | 103 kg |
| Seat height | 925 mm | 992 mm | 960 mm | 950 mm | 958 mm |
| Fuel capacity | 8 L | 7.5 L | 7 L | 7 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 450 SX-F?
The 2021 KTM 450 SX-F has a Capacity of 449.3 ccm (27.42 cubic inches).
What engine power does the KTM 450 SX-F have?
The 2021 KTM 450 SX-F has a Power of 63.0 HP (46.0 kW).
How many gears does the KTM 450 SX-F have?
The 2021 KTM 450 SX-F has a Gearbox of 4-speed.
How much does the KTM 450 SX-F weigh?
The 2021 KTM 450 SX-F has a Dry weight of 100.0 kg (220.5 pounds).
Shop this bike
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The 2021 KTM 450 SX-F is an impressive motorcycle that offers top-of-the-line performance and handling. With its powerful 450cc engine, this bike delivers robust acceleration and plenty of torque for tackling any terrain. The lightweight frame and superior suspension make for precise handling and control, while the ergonomically designed seat and controls enhance rider comfort. Whether you're hitting the motocross track or tearing up the trails, the 2021 KTM 450 SX-F is a top contender in the world of off-road motorcycles.
Overall, the 2021 KTM 450 SX-F is a standout choice for riders looking for a high-performance off-road motorcycle. Its combination of power, agility, and rider-friendly features make it a top pick in its class. With KTM's reputation for quality and innovation, the 450 SX-F is a solid investment for anyone serious about off-road riding.
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