K-Tech DDS Closed Cartridge Kit – Kawasaki ZX-6R 636 (2013–2026) 155-013-150-015

Designed specifically for the stock forks of the Kawasaki ZX-6R 636 from 2013 to 2026, the K-Tech DDS Closed Cartridge Kit delivers a ride that feels as composed after a full day in the saddle as it does on the first corner. Whether you are threading through traffic or threading the needle at a circuit, the Direct Damping System keeps the front end settled and responsive without ever asking you to compromise between comfort and control.

Key Features

• 30-way independently adjustable compression and rebound damping for a setup that suits your exact riding style and conditions
• 18 mm preload adjustment range allows precise spring loading to match rider weight and road surface
• Patented DDS (Direct Damping System) technology actively prevents cavitation, ensuring consistent damping force across the full stroke
• Asymmetric, independently operating damping circuits reduce response lag and sharpen front-end dynamics
• 20 mm piston paired with 31 mm control valves promotes optimised oil flow and finer damping resolution
• 8 mm piston rod minimises system offset for a more linear, predictable feel
• Increased travel compared to the original cartridge, giving the fork greater compliance over rough surfaces
• Race-proven in the British Superbike Championship and the Isle of Man TT

All-Day Comfort Through Precision Engineering

A cartridge upgrade is often thought of as a pure track tool, but the K-Tech DDS is equally transformative on the road. The asymmetric damping circuits work independently, so compression and rebound events are handled separately rather than as a compromise. The result is a fork that absorbs successive bumps without building up harshness — the kind of progressive, consistent feel that keeps your hands fresh and your shoulders relaxed on long rides. The 30-way click adjustment means you can dial in a softer, more pliant character for touring without sacrificing the crispness needed when the road opens up.

Track Performance

On circuit, the DDS design comes into its own. Cavitation — the formation of air bubbles in the damper oil under rapid successive compression — is the enemy of consistent lap times, because it causes the fork to feel progressively softer as a session goes on. K-Tech's patented closed cartridge architecture eliminates this by maintaining a sealed, pressurised oil circuit. Combined with the 31 mm control piston and the spring-loaded stability mechanism, the system delivers repeatable lap-to-lap performance whether you are at Brands Hatch or battling the Mountain Course.

Fitment & Compatibility

This kit fits directly into the original forks of the Kawasaki ZX-6R 636 for all model years from 2013 to 2026. No fork tube modification or external reservoir routing is required — the closed cartridge design integrates cleanly within the existing fork leg architecture.

Installation by an authorised K-Tech Service Centre is strongly recommended to ensure correct assembly, oil fill, and setup, and to achieve the full safety and performance potential of the system.

Specifications

• Spring series: 36-260
• Inner diameter: 20 mm / 32 mm
• Outer diameter (piston rod): 8 mm
• Compression clicks (recommended setting): 16
• Rebound clicks (recommended setting): 18
• Preload (recommended setting): 10 mm
• Preload adjustment range: 18 mm
• Compression / rebound adjustment: 30-way
• Part number: 155-013-150-015