Ready to step up into the big leagues? The 2025 KTM 85 SX is ready to take you there. Developed on track and at an international level, the KTM 85 SX boasts significantly enhanced handling, improved power delivery, and notable enhancements in race pace over longer distances. All said - the KTM 85 SX is 100% READY TO RACE

BEFORE THE GATE

PUMPED UP!

ADJUSTABLE SUSPENSION

Either end of the 2025 KTM 85 SX's WP XACT suspension is adjustable. Upfront, the WP XACT AER fork can be easily adjusted with the use of an air pump. This allows riders to tailor the KTM 85 SX to their specifications, weight, or track conditions. At the rear, the new WP XACT monoshock is fully adjustable for preload, compression, and rebound.

RACER, START YOUR ENGINE!

IGNITION

A new digital ignition finds its way onto the 2025 KTM 85 SX, with the new CDI box from Hidria bringing more processing power and an all-new ignition curve. The benefits? A faster ignition process, smoother engine operation, and shorter heating time in colder temperatures.

LIGHT IT UP!

COMBUSTION CHAMBER

The 2025 KTM 85 SX boasts a redesigned combustion chamber with a new, smaller spark plug. This makes for more effective and efficient combustion, reducing the compression ratio generating more power and torque.

START STRONG

POWERED ON

ENGINE

The 2025 KTM 85 SX packs fresh firepower and gives an updated engine to the starting gate. Weighing 120 g less than the previous generation, the updated engine produces higher performance and optimized integration with the chassis updates. This means more punch in the low and mid-RPM range, more torque, and improved reliability.

MORE POWER

FACTORY PERFORMANCE KIT

Boost the performance of your KTM 85 SX by installing the 105 Factory Kit, ideal for tackling larger track layouts. This kit includes enhanced engine components, a cylinder head, a combustion chamber insert, a CDI control unit, and a spark plug.

MORE BRAAAAP!

EXHAUST

Giving this junior rocket its signature 'Braaap!" is an all-new exhaust system, featuring a new manufacturing process - just like on the full-size 2-stroke KTM SX range. Thanks to the removal of seams between individual sheets, the exhaust flow is optimized, resulting in substantial improvements when it comes to thermodynamics. Simply put - this pipe performs.

SHIFTIN' GEARS

SHIFTING MECHANISM

Clicking into gear is made even smoother for 2025, with an update to the shift drum. Thanks to the new coating finish, shifting up and down the 'box is smoother, more reliable, and rock-solid even after many hours of use.

CALM UNDER FIRE

FLUID RIDER MOTION

ERGONOMICS

Meet the 2025 KTM 85 SX in a dark alley, and you'd be forgiven for thinking it was one of its bigger siblings. With a carefully scaled-down design that mimics that of the full-sized KTM SX range, this little weapon has unparalleled aesthetic appeal. What's more, it also provides young riders with an exceptional riding experience and sensation, getting them ready to step up to the big leagues.

FULLY FUELED

TANK

A new tank design works together with the new frame concept and bodywork, providing the ideal support for young knees to grip, and 1.42 gallons (5.4 liters) of screaming fury to rip.

IN TOUCH WITH THE RIDER

PEGS AND BARS

Grab a hold and step on up! Tapered black Neken-branded handlebars are made of high-quality aluminum alloy ensuring top stability, vibration damping, and safety, while all-new, "no-dirt" designed footrests offer a bigger surface area to step on while being less susceptible to hooking on deep ruts, and take-offs when scrubbing. The result? Better control, more leverage and more to hold onto when charging down the holeshot.

HIT THE BIG STUFF

BRINGING THE BACKBONE

FRAME

The 2025 KTM 85 SX boasts a completely new high-strength chromium molybdenum steel frame design, taken over the full-sized KTM SX range. Together with forged connecting parts, carefully calculated parameters of longitudinal flex and torsional rigidity, and incorporated sheet metal parts allow tailor-made stiffness. The new frame layout features a typical MX design without any cross tube behind the steering head. The rear shock mount is separated from the main upper frame tube like our full-size models, with frame protectors as standard.

RIGID REINFORCEMENT

SUBFRAME

Now pay attention; this is a mouthful - 1-piece polyamide glass-fiber-reinforced aluminum. That's what the subframe is constructed from, for good reason. Not only does this reduce the weight of the whole construction, but it also features specifically engineered rigidity, delivering outstanding handling and rider feedback. It also makes for the perfect spot for integrated electronics, seat support, and hour meter mounting position.

UNFLAPPABLE FRONT END

WP XACT FORK

Featuring the latest in suspension technology, the 2025 KTM 85 SX is fitted with a state-of-the-art WP XACT AER fork. These ultra-lightweight, 43 mm USD forks feature exceptional damping and comfort, allowing the rider to push the limit confidently.

TRACK SMOOTHER

WP XACT SHOCK

Mirroring the latest technology found in the full-size motocross range, the 2025 KTM 85 SX features an all-new fully adjustable WP XACT monoshock. This is perfectly matched to the front forks, bringing ideal balance and damping characteristics, along with improved traction, a more planted feel, and control at speed.

RACING ON RAILS

WHEELS AND TIRES

Keeping the 2025 KTM 85 SX tracking is a set of Black Excel-branded rims and CNC machined hubs fitted with MAXXIS MAXXCROSS MX-ST tires. Not only does this combination deliver outstanding performance on a variety of terrain, but the pattern design and rubber compound deliver exceptional straight-line stability and excellent traction. As always, the KTM 85 SX is available for order with two rims sizes -19/16 and 17/14.

MAINTAINING MOMENTUM

PRECISE, LAP AFTER LAP

RADIATORS

The 2025 KTM 85 SX features new state-of-the-art radiators produced by Pankl, inspired by the full-size SX concept. These feature the same design, albeit shortened to fit the 85cc needs and size, and work to ensure the engine is running at optimal temperatures when being ripped around the track, lap after lap.

TECHNICAL DETAILS

ENGINE

Primary drive - 20:64

Transmission - 6-speed

Secondary gear ratio - 13:46

Starter - Kickstarter

Stroke - 48.95 mm

Bore - 47 mm

Clutch - Wet, multi-disc clutch, Formula hydraulics

Displacement - 84.9 cm³

Design - 1-cylinder, 2-stroke engine

Fuel-mixture generation - Keihin PWK 28

CHASSIS

Weight (without fuel) - 68 kg

Tank capacity (approx.) - 5.4 l

Wheelbase - 1.282 mm

Front brake disc diameter - 240 mm

Rear brake disc diameter - 220 mm

Front brake - Disc brake

Rear brake - Disc brake

Chain - 428, Non-sealed

Frame design - Central-tube frame with double-cradle

Front suspension - XACT 43 WP Upside-Down fork, Ø 43 mm

Ground clearance - 308 mm

Handlebar - Tapered aluminum Ø 28/22 mm

Rear suspension - XACT WP PDS mono shock

Seat height - 845 mm

Silencer - Aluminium

Steering head angle - 63.5 °

Rear subframe design - Aluminum-reinforced polyamide

Suspension travel (front) - 278 mm

Suspension travel (rear) - 289 mm

Tyre dimensions (front/rear) - 70/100; 90/100

Wheels - 1.40 x 17"; 1.60 x 14"