KTM 50 SX - 2015 Specifications and Reviews

The 2015 KTM 50 SX is an entry-level dirt bike engineered for young and novice riders seeking their first motocross experience. Its lightweight 39.8 kg frame, low 684 mm seat height, and manageable power delivery make it ideally suited for building fundamental riding skills. The bike is best known for its reliability and user-friendly nature, with optional power restriction capabilities for absolute beginners.

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Engine and Transmission Specifications

Driveline11:40. Primary drive: 33:61 straight cut spur gear.
Clutch3-lining automatic clutch on the main shaft / centrifugal force
Transmission type,final driveChain
Gearbox1-speed
Cooling systemLiquid
Lubrication systemMixture oil lubrication
IgnitionSELETTRA 2p D36
Fuel systemCarburettor
Bore x Stroke39.5 x 40.0 mm (1.6 x 1.6 inches)
Engine detailsReed intake.
Engine typeSingle cylinder, two-stroke
Capacity:49.00 ccm (2.99 cubic inches)

CategoryCross / motocross
Year2015
ModelKTM 50 SX

Brakes, suspension, Frame and wheels

Rear brakes diameter140 mm (5.5 inches)
Rear brakesSingle disc. Two-piston calipers.
Front brakes diameter160 mm (6.3 inches)
Front brakesSingle disc. Four-piston calipers.
Rear wheel travel185 mm (7.3 inches)
Rear SuspensionWP  Suspension  3614 BAEM
Front wheel travel205 mm (8.1 inches)
Front SuspensionWP  Suspension USD  35
Rake (fork angle)24.0°
Frame typeCentral tube frame of chrome molybdenum steel tubing, powder-coated
 
 

Physical measures and capacities

Fuel capacity2.30 litres (0.61 gallons)
Wheelbase1,032 mm (40.6 inches)
Ground clearance252 mm (9.9 inches)
Seat height684 mm (26.9 inches) If adjustable, lowest setting.
Dry weight39.8 kg (87.7 pounds)
 
 

Other specs

MaintenanceFind parts, fluids, filters, maintenance tools and service items on eBay
CommentsFor absolute beginners, the engine power can be restricted to a moderate 5.5 hp with a kit.
StarterKick
Color optionsOrange/black

Performance Profile & Rider Fit

Best For

Track55%
City5%
Cornering60%
Daily Riding5%
Touring5%
Passenger0%

Rider Profile

Best ForThis is a first motorcycle built for young children just starting out in motocross, not for teen or adult riders of any skill level.
PurposeIt exists purely to teach a child the fundamentals of balance, throttle control, and off-road riding in a safe, low-powered package.
Rider FitIts very low 653 mm seat height and lightweight small-bore chassis are sized specifically for small children, with an adjustable centrifugal clutch to tailor power delivery to their skill.
CharacterIt 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 ForIt is not suitable for adults, taller teens, road use, touring, or anyone seeking real speed or highway capability.

Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.

Rider Fit Visualizer

2015 KTM 50 SX Rider Ergonomics Assessment

Calculated in your browser only - your height/inseam are never sent to our servers.

Feet:

At 684mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with both feet flat on the 2015 KTM 50 SX, with a cramped knee angle of around 55 degrees and an upright riding position.

Data quality: measured. Assumes about 30mm of suspension sag once seated (a typical street-bike rule of thumb - stiffer or softer suspension will vary). This is an approximation from category-typical geometry and generic body proportions, not a measurement of this specific bike or you - sit on it before you buy.

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