
The facts.
| Brand | K-Tech |
|---|---|
| Part number | FSK-021 |
| Seal manufacturer | NOK |
| Inner diameter | 55.00 mm |
| Outer diameter | 68.00 mm |
| Contents | 2x fork oil seals, 2x dust caps |
| Fitment | Honda CBR 1000 RR SP (2014–2019) — SP models only |
DescriptionThe whole story▼
Fork seal integrity is the foundation of front-end safety: a weeping fork contaminates your brake disc and destroys damping precision in the corners where it matters most. The K-Tech FSK-021 fork oil seal and dust cap kit addresses that risk with seals manufactured by NOK — the Japanese sealing specialist chosen as original equipment by Japan's leading suspension manufacturers — giving your Honda CBR 1000 RR SP the exacting standard it left the factory with.
Key Features
- NOK-manufactured oil seals ensure OEM-grade sealing integrity, guarding against fork oil contamination of the front brake disc — a direct safety concern on track and road alike.
- Precision-dimensioned to 55.00 mm inner diameter and 68.00 mm outer diameter, guaranteeing a correct interference fit in the CBR 1000 RR SP fork leg.
- Dust caps physically block grit, water and debris from reaching the fork stanchion surface, extending seal life and protecting the hard-chrome coating.
- NOK is the preferred OE sealing supplier for major Japanese suspension manufacturers, making this kit a like-for-like replacement rather than an aftermarket compromise.
- K-Tech part number FSK-021 ensures unambiguous identification and straightforward reordering.
- Specific fitment for SP variants only — the tighter tolerance of the Öhlins-equipped SP fork demands a correctly sized seal; this kit delivers exactly that.
Quality & Construction
NOK has supplied original-equipment fork seals to the Japanese motorcycle industry for decades. Their compounds are engineered to maintain elasticity across a wide operating temperature range — from a cold early-morning commute to sustained track use — without hardening, cracking or taking a set. The result is consistent oil retention throughout the service interval rather than a gradual weep that goes unnoticed until brake performance is compromised.
K-Tech sources and validates these seals specifically for the suspension systems they service. The FSK-021 kit is not a generic fit; every dimension is confirmed against the CBR 1000 RR SP fork specification, so there is no risk of undersized seals extruding under pressure or oversized units refusing to seat correctly.
Road & Track Relevance
The Honda CBR 1000 RR SP is equipped from the factory with Öhlins semi-active suspension — a system whose sensitivity makes seal condition even more critical than on a conventional fork. Degraded or incorrect seals allow oil to bypass the damping circuits, introducing inconsistency that neither the electronics nor the rider can compensate for. Replacing seals at the correct service interval with NOK-quality components restores the predictability the SP was designed to deliver.
Fitment & Compatibility
This kit fits exclusively the SP variants listed below. Standard (non-SP) CBR 1000 RR models use different fork dimensions and require a separate seal kit.
- Honda CBR 1000 RR SP — 2014
- Honda CBR 1000 RR SP — 2015
- Honda CBR 1000 RR SP — 2016
- Honda CBR 1000 RR SP — 2017
- Honda CBR 1000 RR SP — 2018
- Honda CBR 1000 RR SP — 2019
Installation Note
K-Tech recommends installation by an authorised K-Tech Service Centre. Fork seal replacement requires dedicated seal drivers and a thorough understanding of fork disassembly torque procedures to guarantee correct seating and safe operation. Improper installation can result in premature seal failure or, in a worst case, sudden fork oil loss during braking.
Specifications
- Part number: FSK-021
- Inner diameter: 55.00 mm
- Outer diameter: 68.00 mm
- Seal manufacturer: NOK
- Contents: 2x fork oil seals, 2x dust caps
- Fitment: Honda CBR 1000 RR SP (2014–2019) — SP models only
What's includedEverything in the box▼
- 2x fork oil seals
- 2x dust caps
FitmentWhich bikes this fits▼
- Honda CBR 1000 RR SP (2014–2019)
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