K-Tech RAZOR-R Shock Absorber for KTM RC 390 (2014–2021) – 279S-014-155-005

When reliable, consistent damping performance underpins every riding decision — from a fast road series to a club race weekend — the suspension component fitted to your KTM RC 390 carries real responsibility. The K-Tech RAZOR-R shock absorber for the KTM RC 390 (2014–2021) is engineered to that standard: a fully adjustable, nitrogen-charged rear unit built to replace the standard fitment with a component that delivers measurably superior traction, chassis control, and ride consistency across both road and track use.

Key Features

• 12-click compression damping adjustment for precise tuning to varying road and track conditions
• 14-click rebound damping adjustment for optimal stability through rapid direction changes
• Adjustable spring preload to dial in the unit for individual rider weight and riding style
• Length adjustment (RCU travel: 4.00 mm) allows fine-tuning of ride height and chassis geometry
• Nitrogen (N2) pressurised at 10.00 bar, preventing aeration and ensuring consistent damping across sustained high-speed use
• 46-150 spring series fitted as standard, delivering a controlled spring force of 100.00 N
• Direct OEM-compatible fitment — straightforward installation without chassis modification

Engineering and Construction

The RAZOR-R is K-Tech's dedicated performance upgrade for riders who demand more than standard equipment provides without moving to a fully bespoke race unit. The nitrogen gas charge eliminates the foam formation that degrades damping oil under repeated compression cycles, keeping the shock's response linear and predictable whether the conditions demand progressive street riding or repeated hard braking into a tight hairpin.

The damper body (35.00 mm RCPU housing diameter, 14.00 mm RCPU rod diameter) is sized to deliver rigidity without unnecessary mass, and the upper and lower mounting eyes are machined to precise tolerances — 32.00 mm width with a 10.00 mm bolt diameter at the top, 41.00 mm width with a 10.00 mm bolt diameter at the lower end — ensuring direct, rattle-free replacement of the factory unit.

On-Road and Track Performance

With a total unit length of 303.50 mm, a length tolerance of -7 mm / +3 mm, a stroke of 53.00 mm, and 11 mm of spring preload adjustment, the RAZOR-R gives the KTM RC 390 rider a genuinely wide setup window. Compression clicks can be wound through all twelve positions to firm up the chassis under braking or soften the ride for extended road touring; the fourteen rebound clicks provide equally granular control over how quickly the shock extends after compression — critical for maintaining rear tyre contact through corner exit.

Installation and Safety

Installation of the RAZOR-R shock absorber must be carried out exclusively by an authorised K-Tech Service Centre. Correct fitment requires specialist tools and technical knowledge to guarantee the unit performs to its rated specification and that all safety requirements are met. Attempting self-installation without the appropriate equipment risks incorrect setup, premature wear, and — critically — compromised handling safety. Contact your nearest K-Tech authorised dealer before fitting.

Fitment and Compatibility

This shock absorber is designed as a direct-fit replacement for the following motorcycle:

• KTM RC 390 — model years 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021

Specifications