Motocross Bikes
2021KTM 450 SX-F Factory Edition
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The 2021 KTM 450 SX-F Factory Edition is a race-ready motocross bike with upgraded parts and factory team colours. Its liquid-cooled 449.3cc four-stroke single drives through a four-speed gearbox and chain. A 960 mm seat, 106.4 kg wet weight and 7-litre tank suit the premier 450 class.
- Capacity
- 449.3 ccm
- Engine
- Single, four-stroke
- Gearbox
- 4-speed
- Dry weight
- 100.4 kg
- Seat height
- 960 mm
- Power
- 56.0 HP (41.2 kW)
What’s new for the 2021 KTM 450 SX-F Factory Edition
vs the 2020| Spec | 2020 | 2021 |
|---|---|---|
| Gearbox | 5-speed | 4-speed |
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Purpose-built for motocross racing on closed tracks, prioritizing outright performance over versatility.
- Built for
- Razor-sharp, explosive, and race-focused, rewarding aggressive input with elite agility and jump-and-corner precision.
- Not ideal for
- It is not suitable for commuting, touring, passengers, or riders wanting comfort and low-maintenance daily usability.
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
- 56.0 HP (41.2 kW)
- Engine type
- Single, four-stroke
- Power/weight ratio
- 0.5578 HP/kg (dry)
- Bore x stroke
- 95.0 x 63.4 mm
- Cooling system
- Liquid
- Fuel system
- Injection
- Starting
- Electric
- Ignition
- Keihin EMS
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
- 960 mm
- Dry weight
- 100.4 kg
- Wet weight
- 106.4 kg
- Fuel capacity
- 7.00 litres
- Ground clearance
- 370 mm
Chassis & suspension
- Frame
- 25CrMo4 steel central-tube frame
- Front suspension
- WP-USD, AER 48, Ø 48 mm
- Rear suspension
- WP shock absorber with linkage
- Front wheel travel
- 300 mm
- Rear wheel travel
- 300 mm
- Rake (fork angle)
- 26.5°
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
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 | 2017 | 2019 | 2021 | 2022 | 2024 | 2026 |
|---|---|---|---|---|---|---|
| Capacity | 449 cc | 449 cc | 449 cc | 449 cc | 450 cc | 450 cc |
| Dry weight | 100 kg | 100 kg | 100 kg | 100 kg | 103 kg | 103 kg |
| Seat height | 960 mm | 960 mm | 960 mm | 960 mm | 958 mm | 958 mm |
| Fuel capacity | 7 L | 7 L | 7 L | 7 L | 7.2 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 Factory Edition?
The 2021 KTM 450 SX-F Factory Edition has a Capacity of 449.3 ccm (27.42 cubic inches).
What engine power does the KTM 450 SX-F Factory Edition have?
The 2021 KTM 450 SX-F Factory Edition has a Power of 56.0 HP (41.2 kW).
How many gears does the KTM 450 SX-F Factory Edition have?
The 2021 KTM 450 SX-F Factory Edition has a Gearbox of 4-speed.
How much does the KTM 450 SX-F Factory Edition weigh?
The 2021 KTM 450 SX-F Factory Edition has a Dry weight of 100.4 kg (221.3 pounds).
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