Motocross Bikes
2020KTM 50 SX Mini
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The 2020 KTM 50 SX Mini is the smallest motocross bike in KTM's range, for the youngest riders. Its liquid-cooled 49cc two-stroke single drives through a single-speed automatic clutch and chain, and a kit can restrict its power for beginners. A very low 558 mm seat, 40 kg dry weight and 2.1-litre tank suit small children.
- Capacity
- 49.0 ccm
- Engine
- Single, two-stroke
- Gearbox
- 1-speed
- Dry weight
- 40.0 kg
- Seat height
- 558 mm
- Power
- 5.4 HP (4.0 kW)
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- It exists purely to teach small children the basics of throttle control, balance, and off-road riding on a real motocross-style bike in a safe, controlled way.
- Built for
- It behaves like a proper miniature motocrosser, with real suspension, a real frame, and real brakes, giving a authentic but gentle introduction to dirt bike riding.
- Not ideal for
- It is completely unsuitable for adults, teenagers, road use, touring, or any rider who has outgrown beginner-level youth motocross machines.
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
- 49.0 ccm
- Power
- 5.4 HP (4.0 kW)
- Engine type
- Single, two-stroke
- Power/weight ratio
- 0.1350 HP/kg (dry)
- Bore x stroke
- 39.5 x 40.0 mm
- Cooling system
- Liquid
- Fuel system
- Carburettor
- Starting
- Kick
- Ignition
- Seletra 2p D36
- Lubrication system
- Mixture oil lubrication
Transmission
- Gearbox
- 1-speed
- Transmission type
- Manual
- Final drive
- Chain
- Clutch
- Centrifugal clutch
Dimensions & weight
- Wheelbase
- 1032 mm
- Seat height
- 558 mm
- Dry weight
- 40.0 kg
- Fuel capacity
- 2.10 litres
- Ground clearance
- 184 mm
Chassis & suspension
- Frame
- Chrome-molybdenum steel central-tube frame
- Front suspension
- WP upside-down Ø 35 mm
- Rear suspension
- WP shock absorber
- Front wheel travel
- 100 mm
- Rear wheel travel
- 147 mm
- Rake (fork angle)
- 24.0°
Brakes & wheels
- Front brakes
- Single disc. Four-piston calipers.
- Front brakes diameter
- 160 mm
- Rear brakes
- Single disc. Two-piston calipers.
- Rear brakes diameter
- 160 mm
Other
- Color options
- Orange/white/black
- Comments
- The engine power can be restricted to 5.5 hp with a kit.
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 | 2012 | 2015 | 2018 | 2020 | 2021 | 2024 |
|---|---|---|---|---|---|---|
| Capacity | 49 cc | 49 cc | 49 cc | 49 cc | 50 cc | 50 cc |
| Dry weight | 41 kg | 39 kg | 40 kg | 40 kg | 40 kg | 44 kg |
| Seat height | 558 mm | 558 mm | 558 mm | 558 mm | 558 mm | 653 mm |
| Fuel capacity | 2 L | 2 L | 2.3 L | 2.1 L | 2.1 L | 2.3 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 50 SX Mini?
The 2020 KTM 50 SX Mini has a Capacity of 49.0 ccm (2.99 cubic inches).
What engine power does the KTM 50 SX Mini have?
The 2020 KTM 50 SX Mini has a Power of 5.4 HP (4.0 kW).
How many gears does the KTM 50 SX Mini have?
The 2020 KTM 50 SX Mini has a Gearbox of 1-speed.
How much does the KTM 50 SX Mini weigh?
The 2020 KTM 50 SX Mini has a Dry weight of 40.0 kg (88.2 pounds).
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