2025 KTM 85 SX
Filling the gap between the KTM 65 SX and the KTM 125 SX, the 2025 KTM 85 SX provides young racers the platform to launch into full-size motocross competition.
The new 2025 KTM 85 SX is already rolling off the Austria production line in July and will be available at Australian KTM dealers starting in August.
For 2025, the KTM 85 SX has been updated significantly to enhance handling characteristics, boost rider confidence, and improve engine performance in the low to mid-rpm range.
A completely new frame, sub-frame, and swing-arm provide the basis for the update over the previous generation.
Based on the full-sized KTM SX frame concept, the high-strength chromium molybdenum steel frame integrates carefully calculated longitudinal flex and torsional rigidity parameters for rider feedback, energy absorption, and straight-line stability.
This is mated to a 1-piece polyamide glass fiber reinforced aluminum sub-frame, reducing overall weight and providing a platform to integrate the electronics.
Manufactured using a gravity die-cast process, the one-piece aluminum swing-arm offers exceptional strength with minimal weight. The topology has been optimized for maximum rigidity, and an improved casting process reduces the weight by 300 grams. Additionally, a 20 mm rear axle has been fitted to further optimise and match the chassis flex characteristics.
The new frame also allowed for a new riding experience with a steering head at 63.5° —half a degree flatter than the previous generation—and moved rearwards by 6 mm. KTM claim this has aided in cornering stability and a more planted feel in high-speed acceleration, further supported by a wider steering angle of 35°, which has improved the steering angle by 2° over its predecessor.
The engine position has also been tweaked, with a 3° rotation upwards to maintain a more direct connection point with the swing-arm. This has allowed for the most effective weight distribution when hitting jumps.
Regarding suspension updates, the 2025 KTM 85 SX benefits from an all-new, fully-adjustable WP XACT monoshock mirroring the latest technology found in the full-size motocross range. Linked directly to the swingarm in a PDS format, the WP XACT monoshock has a different mounting point to the previous generation, allowing for a more compact rear shock design with a shorter stroke. KTM claims that this provides improved rider feedback and stability over larger jumps and rough tracks.
A notable update over the previous generation is a lower suspension travel of 289 mm compared to 305 mm on the previous model. KTM claim this has aided dramatically in controlling rebound and compression in the rear shock, with a more planted feel, better traction, and overall handling.
Up front, the 2025 KTM 85 SX maintains the championship-proven and lightweight 43 mm WP XACT USD AER fork. Compared to the previous generation, the air pressure is tuned to 4.8 bar from the previous 5.0 bar for a smoother ride and suspension compliance.
An updated engine has improved power in the low and mid-rpm range and increased torque for performance. This is made possible by a new cylinder head and spark plug, ignition, exhaust, shift drum, and updated carburetor settings.
Changes on the new generation KTM 85 SX have also extended to the overall looks, with all-new slimmer bodywork mimicking that of the full-sized KTM SX range. This new look is also functional, allowing for better contact with young riders’ boots when standing up. New footpegs, a larger radiator, and improved triple clamps round out the changes.
The 2025 KTM 85 SX is another example of KTM’s dedication to mini-cross, with the same amount of energy and attention going to the development of grassroots racing as it imparts at a Supercross level.
