KTM 525 SX Racing - 2003 Specifications and Reviews

The 2003 KTM 525 SX Racing is a high-performance motocross machine designed for competitive riders seeking maximum power and agility. Its potent 510cc liquid-cooled four-stroke engine delivers impressive output in a lightweight package, making it ideal for professional and amateur racers. The bike is renowned for its responsive handling and aggressive styling on mixed terrain.

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General information

CategoryCross / motocross
Year2003
ModelKTM 525 SX Racing

Engine and Transmission Specifications

Transmission typefinal driveChain
Gearbox4-speed
Cooling systemLiquid
Fuel systemCarburettor
Bore x stroke95.0 x 72.0 mm (3.7 x 2.8 inches)
Compression11.0:1
Stroke4
Engine typeSingle cylinder
Capacity:510.40 ccm (31.14 cubic inches)
 
 

Physical measures and capacities

Wheelbase1,481 mm (58.3 inches)
Ground clearance380 mm (15.0 inches)
Seat height925 mm (36.4 inches) If adjustable, lowest setting.
Dry weight107.0 kg (235.9 pounds)

KTM 525 SX Racing dimensions and frame

Rear brakes diameter220 mm (8.7 inches)
Rear brakesSingle disc
Front brakes diameter260 mm (10.2 inches)
Front brakesSingle disc
Rear tyre dimensions110/90-19
Front tyre dimensions80/100-21
Rear suspension travel335 mm (13.2 inches)
Front suspension travel300 mm (11.8 inches)
 
 

Speed and acceleration

Fuel capacity7.00 litres (1.85 gallons)

Other specs

MaintenanceFind parts, fluids, filters, maintenance tools and service items on eBay

Performance Profile & Rider Fit

Best For

Track40%
City10%
Cornering85%
Daily Riding8%
Touring8%
Passenger0%

Rider Profile

Best ForThis is a full-on competition motocross machine best suited to experienced off-road riders and racers, not beginners.
PurposeBuilt purely for motocross racing, it excels at jumps, berms, and rough closed-course terrain rather than any form of street use.
Rider FitThe tall 925mm seat height, lightweight 106kg dry chassis, and aggressive four-stroke power delivery demand strong rider fitness and confidence standing on the pegs.
CharacterSharp, explosive, and razor-focused, this bike rewards aggressive inputs with rapid direction changes and strong acceleration out of corners.
Not Ideal ForThis is not suitable for commuting, touring, carrying a passenger, or any rider seeking comfort and low-maintenance road use.

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

Rider Fit Visualizer

2003 KTM 525 SX Racing Rider Ergonomics Assessment

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Feet:

At 925mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with cannot reach comfortably on the 2003 KTM 525 SX Racing, with a cramped knee angle of around 80 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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