K-Tech RAZOR-R HPA Shock Absorber for KTM RC 390 (2022–2025) – Part 280S-022-155-005

Whether you're threading lap after lap on circuit or carrying speed through long sweeping roads, the K-Tech RAZOR-R HPA shock absorber transforms the rear suspension of the KTM RC 390 (2022–2025) into a fully tuneable, rider-specific platform. Nitrogen-charged and built around the proven 46-180-series spring, it delivers consistent, fade-free damping that keeps you comfortable and in control across every hour of riding.

Key Features

• 12-click compression damping adjustment for dialling in ride comfort or sharper track response to suit exactly your style and road surface
• 12-click rebound damping adjustment enables precise fine-tuning of chassis recovery speed through fast direction changes
• Adjustable spring preload accommodates a wide range of rider weights and riding loads without compromising feel
• Length adjustment lets you fine-tune ride height for improved geometry, cornering clearance, and overall handling balance
• Nitrogen (N2) charge eliminates aeration and foam-up under sustained hard use, keeping damping consistent from the first corner to the last
• Multiple spring-rate options available so the unit can be matched exactly to your weight and riding discipline
• Direct, drop-in fitment for KTM RC 390 model years 2022 through 2025 — no modifications required

Built for Comfort, Tuned for Control

The RAZOR-R HPA is K-Tech's answer to riders who demand more from their suspension without sacrificing the all-day comfort that makes a motorcycle genuinely enjoyable to ride. The 46-180-series spring works in harmony with the nitrogen-pressurised damper body to absorb road imperfections progressively rather than harshly, reducing fatigue on longer rides while still providing the planted, communicative feel you need when pushing harder. At 35.00 mm the RCU housing diameter and 14.00 mm shaft deliver a damper stiffness-to-weight balance that keeps the RC 390 agile without introducing unwanted harshness into the ride.

Precision Adjustment, Real-World Results

With 12 clicks of both compression and rebound adjustment, 12 mm of spring preload range, and a length tolerance of -7 mm / +3 mm around the 308.50 mm nominal length, the RAZOR-R HPA gives you a genuinely wide tuning window. A 60.00 mm stroke, 120.00 N spring rate, and 10.00 bar gas pressure combine to provide a damping characteristic that works equally well on the road on a Sunday morning and on a track day in the afternoon — adjust the compression clicks to firm things up, soften the rebound for a smoother road feel, and set preload once for your weight. The result is a rear end that tracks confidently and returns to the ideal ride height quickly without bouncing.

Installation Note

Installation of the K-Tech RAZOR-R HPA shock absorber should be carried out exclusively by an authorised K-Tech Service Centre. Specialist tools and technical knowledge are required to ensure the unit is fitted correctly and performs at its full potential. Do not attempt home installation without the appropriate equipment and expertise.

Fitment & Compatibility

• KTM RC 390 — model years 2022, 2023, 2024, 2025

Specifications