Öhlins FKR 121 TTX 25 cartridge kit for Aprilia RSV4 1100 Factory
02 · Data & docs

The facts.

Technical data
Part NumberFKR 121
TechnologyTTX 25 (spring-pressurised closed system)
Stroke120 mm
Spring Series04744-series
Included Spring Rates9.0, 9.5, 10.0 N/mm
Piston Rod Diameter8 mm
FitmentAprilia RSV4 1100 Factory (2020–2026)
Fork CompatibilityÖhlins FL 963
Intended UseMotorsport / closed-circuit racing only — not road legal
DescriptionThe whole story▼

Engineered exclusively for the Aprilia RSV4 1100 Factory (2020–2026), the Öhlins FKR Cartridge Kit Racing TTX 25 FKR 121 transforms the factory fork into a precision racing tool. Its spring-pressurised closed system eliminates the pressure loss risk associated with conventional gas-pressure units, delivering consistent, repeatable damping lap after lap so you can focus entirely on riding.

Key Features

  • Spring-pressurised closed system removes the need for external gas charging, cutting maintenance time and preventing damping inconsistencies over a long race day.
  • Advanced TTX technology with a newly developed piston and 8 mm piston rod reduces internal friction, producing rapid response and a linear damping curve that rewards precise set-up work.
  • Three springs included (04744-series, rates 9.0, 9.5 and 10.0 N/mm) so you can dial in the correct spring rate for your weight and riding style straight out of the box.
  • 120 mm stroke matches the geometry demands of the RSV4 1100 Factory chassis, preserving correct ride height and steering geometry.
  • Direct fitment for forks equipped with the Öhlins FL 963 cartridge — no adapters or machining required.
  • Installation manual included; Öhlins recommends fitting by an authorised Öhlins Service Centre for best results.

TTX Technology on Track

The TTX (Twin Tube X) cartridge design keeps oil and gas separated throughout the stroke, meaning the damping characteristics stay stable whether you are pushing through a long, fast corner or hammering repeated braking zones. The lower internal pressure enabled by the 8 mm piston rod shortens the hydraulic response time, so the fork reacts to surface changes almost instantaneously rather than playing catch-up. The result is improved traction on exit and noticeably better front-end feel — the kind of feedback that builds confidence and trims lap times.

Built for the Racetrack, Not the Road

The FKR 121 is a motorsport product homologated for closed-circuit competition only. It is not approved for road use. If you race your RSV4 1100 Factory at club level, trackday events or in series such as the Aprilia Racing Days, this kit provides a structured upgrade path from the standard fork internals without requiring a full fork replacement. The spring-pressurised circuit also simplifies trackside maintenance — no nitrogen bottle needed between sessions.

Fitment & Compatibility

This cartridge kit is designed specifically for the following model:

  • Aprilia RSV4 1100 Factory — model years 2020, 2021, 2022, 2023, 2024, 2025, 2026
  • Compatible with forks fitted with the Öhlins FL 963 cartridge only. Verify your fork specification before ordering.

Fitting and Setup Service

Öhlins suspension rewards careful fitting. We recommend having the work done by an authorised Öhlins service centre — and we are one ourselves: we fit, service and set up Öhlins components in house. If you would like us to handle the installation, just ask and we will quote it with the order.

Specifications

Part Number FKR 121
Technology TTX 25 (Twin Tube X, spring-pressurised closed system)
Stroke 120 mm
Spring Series 04744-series
Included Spring Rates 9.0, 9.5, 10.0 N/mm
Piston Rod Diameter 8 mm
Fitment Aprilia RSV4 1100 Factory (2020–2026), Öhlins FL 963 fork
Intended Use Motorsport / closed-circuit racing only — not road legal
FitmentWhich bikes this fits▼
  • Aprilia RSV4 1100 Factory (2020–2026)
07 · Support

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