Motocross Bikes
2018KTM 50 SX
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The 2018 KTM 50 SX is an entry-level two-stroke dirt bike designed for young riders aged 4-8 years old, offering an ideal balance of performance and manageability. Known for its lightweight construction, responsive handling, and KTM's proven reliability, it features adjustable power output for gradual skill development. The compact frame, low seat height, and nimble character make it the go-to choice for beginners entering competitive youth motocross.
- Capacity
- 49.0 ccm
- Engine
- Single, two-stroke
- Gearbox
- 1-speed
- Dry weight
- 41.5 kg
- Seat height
- 684 mm
- Power
- 5.4 HP (4.0 kW)
Other years
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- It exists purely to teach a child the fundamentals of balance, throttle control, and off-road riding in a safe, low-powered package.
- Built for
- It behaves like a purpose-built miniature dirt bike, docile and forgiving with an automatic single-speed gearbox that removes clutch and shifting complexity so a child can focus on riding.
- Not ideal for
- It is not suitable for adults, taller teens, road use, touring, or anyone seeking real speed or highway capability.
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
- 0.1301 HP/kg (dry)
- Bore x stroke
- 39.5 x 40.0 mm
- Compression
- 12.5:1
- 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
- 684 mm
- Dry weight
- 41.5 kg
- Fuel capacity
- 2.30 litres
- Ground clearance
- 252 mm
Chassis & suspension
- Frame
- Central-tube frame with double-cradle
- Front suspension
- WP upside-down Ø 35 mm
- Rear suspension
- WP shock absorber
- Front wheel travel
- 205 mm
- Rear wheel travel
- 185 mm
- Rake (fork angle)
- 24.0°
- Trail
- 90 mm
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
- Front tyre
- 60/100-12
- Rear tyre
- 2.75-10
Other
- Color options
- Orange/white/black
- Comments
- The engine power can be restricted to 5.5 hp with a kit.
Specs last verified against published sources: .
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 | 2006 | 2011 | 2017 | 2018 | 2022 | 2027 |
|---|---|---|---|---|---|---|
| Capacity | 49 cc | 49 cc | 49 cc | 49 cc | 49 cc | 50 cc |
| Dry weight | 39 kg | 40 kg | 42 kg | 42 kg | 42 kg | 44 kg |
| Seat height | 650 mm | 684 mm | 684 mm | 684 mm | 665 mm | 653 mm |
| Fuel capacity | 1.8 L | 2.3 L | 2.3 L | 2.3 L | 2.3 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?
The 2018 KTM 50 SX has a Capacity of 49.0 ccm (2.99 cubic inches).
What engine power does the KTM 50 SX have?
The 2018 KTM 50 SX has a Power of 5.4 HP (4.0 kW).
How many gears does the KTM 50 SX have?
The 2018 KTM 50 SX has a Gearbox of 1-speed.
How much does the KTM 50 SX weigh?
The 2018 KTM 50 SX has a Dry weight of 41.5 kg (91.5 pounds).
Shop this bike
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The 2018 KTM 50 SX motorcycle is an ideal choice for young riders looking to enter the world of motocross. This bike is designed with top-of-the-line technology and features, including a liquid-cooled engine and adjustable suspension. The lightweight frame and compact design make it easy to handle for young riders, while still providing the power and performance needed for off-road racing. With its high-quality construction and reliable performance, the KTM 50 SX is a top contender in the youth motocross market.
Overall, the 2018 KTM 50 SX motorcycle is a top choice for young riders looking to get into motocross racing. Its advanced features and durable construction make it a reliable and high-performing option for kids who are serious about their off-road riding. Whether it's for competitive racing or recreational use, the KTM 50 SX delivers top-notch performance and handling that young riders will appreciate.
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