Motocross Bikes
2021KTM 50 SX Mini
26 fields on record
The 2021 KTM 50 SX Mini is a competitive minibike engineered for young riders and beginners seeking an entry point into off-road racing. Built around a lightweight 49.8cc two-stroke engine with liquid cooling and automatic transmission, it delivers responsive performance and easy handling. Known for its aggressive styling and professional-grade suspension, the 50 SX Mini excels in motocross training and recreational riding.
- Capacity
- 49.8 ccm
- Engine
- Single single, two-stroke
- Gearbox
- Not on record
Know it? Add it → - Dry weight
- 40.0 kg
- Seat height
- 558 mm
- Power
- 5.4 HP
What’s new for the 2021 KTM 50 SX Mini
vs the 2020| Spec | 2020 | 2021 |
|---|---|---|
| Engine capacity | 49.0 ccm (2.99 cubic inches) | 49.8 ccm (3.04 cubic inches) |
| Power | 5.36 HP (estimated - EU/UK 50cc power-restricted class, 4kW legal cap) | 5.4 HP |
| Seat height | 684 mm (26.9 inches) | 558 mm (22.0 inches) |
| Gearbox | 1-speed | not listed |
| Front suspension | WP upside-down Ø 35 mm | XACT 35 WP Upside-Down fork, Ø 35 mm |
| Rear suspension | WP shock absorber | XACT WP mono shock |
| Front brakes | Single disc. Four-piston calipers. | Single disc |
| Rear brakes | Single disc. Two-piston calipers. | Single disc |
| Wheelbase | 1032 mm (40.6 inches) | not listed |
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
- 49.8 ccm
- Power
- 5.4 HP
- Engine type
- Single single, two-stroke
- Power/weight ratio
- 0.1350 HP/kg
- Bore x stroke
- 39.5 x 40.0 mm
- Cooling system
- Liquid
- Fuel system
- Carburettor
- Starting
- Kick
Transmission
- Transmission type
- Automatic
- Final drive
- Chain
- Clutch
- Centrifugal
Dimensions & weight
- Seat height
- 558 mm
- Dry weight
- 40.0 kg
- Fuel capacity
- 2.10 litres
- Ground clearance
- 184 mm
Chassis & suspension
- Frame
- 25CrMo4 steel central-tube
- Front suspension
- XACT 35 WP Upside-Down fork, Ø 35 mm
- Rear suspension
- XACT WP mono shock
- Front wheel travel
- 100 mm
- Rear wheel travel
- 147 mm
- Rake (fork angle)
- 24.0°
Brakes & wheels
- Front brakes
- Single disc
- Front brakes diameter
- 160 mm
- Rear brakes
- Single disc
Other
- Color options
- White/orange/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 | 2012 | 2015 | 2018 | 2021 | 2024 |
|---|---|---|---|---|---|
| Capacity | 49.00 ccm (2.99 cubic inches) | 49.00 ccm (2.99 cubic inches) | 49.00 ccm (2.99 cubic inches) | 49.8 ccm (3.04 cubic inches) | 49.8 ccm (3.04 cubic inches) |
| Dry weight | 40.5 kg (89.3 pounds) | 39.0 kg (86.0 pounds) | 40.0 kg (88.2 pounds) | 40.0 kg (88.2 pounds) | 40.0 kg (88.2 pounds) |
| Seat height | 558 mm (22.0 inches) | 558 mm (22.0 inches) | 558 mm (22.0 inches) | 558 mm (22.0 inches) | 558 mm (22.0 inches) |
| Fuel capacity | 2.00 litres (0.53 gallons) | 2.00 litres (0.53 gallons) | 2.30 litres (0.61 gallons) | 2.10 litres (0.55 US gallons) | 2.30 litres (0.61 US gallons) |
| Color options | Orange/black/white | Orange/black/white | Orange/white/black | White/orange/black | White/orange/grey |
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 2021 KTM 50 SX Mini has a Capacity of 49.8 ccm (3.04 cubic inches).
What engine power does the KTM 50 SX Mini have?
The 2021 KTM 50 SX Mini has a Power of 5.4 HP.
How much does the KTM 50 SX Mini weigh?
The 2021 KTM 50 SX Mini has a Dry weight of 40.0 kg (88.2 pounds).
Shop this bike
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The 2021 KTM 50 SX Mini is a top-of-the-line motorcycle designed specifically for young riders. With its high-quality construction and reliable performance, this mini bike is perfect for aspiring motocross champions. The 50 SX Mini features a powerful 2-stroke engine, adjustable suspension, and a lightweight chassis for easy handling. Its compact size and user-friendly controls make it an ideal choice for kids who are just learning to ride off-road. Overall, the 2021 KTM 50 SX Mini offers exceptional quality and performance for young riders looking to hone their skills on the track.
The 2021 KTM 50 SX Mini is a fantastic option for young riders who are serious about motocross. This mini bike is packed with advanced features that deliver a thrilling riding experience while prioritizing safety and control. The bike's modern design, powerful engine, and durable construction set it apart from other motorcycles in its class. Whether it's hitting the jumps, navigating tight corners, or tearing up the trails, the 2021 KTM 50 SX Mini is sure to impress young riders and their parents alike.
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