The facts.
| Brand | K-Tech |
|---|---|
| Part Number | FSS-007 |
| Seal Manufacturer | NOK |
| Inner Diameter | 41.00 mm |
| Outer Diameter | 54.00 mm |
| Height | 11.00 mm |
| Quantity | 2x oil seals (one pair) |
| Fitment | Triumph Street Triple 765 S / R / RS (2017–2026) |
DescriptionThe whole story▼
Sourced from NOK — the original-equipment seal supplier trusted by the world's leading Japanese suspension manufacturers — this K-Tech fork oil seal kit delivers the kind of material quality and dimensional precision that cheap aftermarket alternatives simply cannot match. Designed as a direct replacement for the Triumph Street Triple 765 S, R and RS (2017–2026), part number FSS-007 keeps your forks leak-free and performing exactly as intended.
Key Features
- NOK-manufactured seals: the same globally recognised supplier specified by premium Japanese suspension OEMs, chosen here for exceptional durability and consistent sealing performance.
- Exact OEM dimensions — 41.00 mm inner diameter, 54.00 mm outer diameter, 11.00 mm height — ensuring a drop-in fit with no modification or shimming required.
- Supplied as a matched pair, covering both fork legs in a single purchase and simplifying a complete service interval.
- Prevents fork oil weeping and contamination of the dust seal, preserving damping consistency and protecting stanchion surfaces from accelerated wear.
- Precision-cut seal lip geometry maintains correct contact pressure across the full range of fork travel, from slow urban compression to hard track braking.
Build Quality and Materials
The NOK name is synonymous with sealing integrity. The company has spent decades engineering elastomer compounds and lip profiles that resist degradation from fork oil chemistry, temperature cycling and road contamination. Each seal in this kit is manufactured to tight dimensional tolerances, so the interference fit in the fork leg remains consistent and the lip tracks the stanchion surface without generating excess friction. The result is a seal that does its job quietly, letting the fork damping do its job properly.
Why Material Quality Matters Here
A fork seal is a small component with an outsized effect on suspension behaviour. An inferior seal that weeps even marginally introduces oil film onto the dust seal and stanchion, which then attracts grit — the very abrasive that shortens stanchion life. The NOK compound used in the FSS-007 kit resists this cycle, maintaining a dry, clean interface between leg and tube across a far longer service life than economy replacements.
Fitment and Compatibility
This kit is designed specifically for the Triumph Street Triple 765 platform. It fits all variants across the full production run listed below:
- Triumph Street Triple 765 S (2017–2026)
- Triumph Street Triple 765 R (2017–2026)
- Triumph Street Triple 765 RS (2017–2026)
Please verify your model year and fork inner diameter before fitting. Installation requires specialist fork tools and a sound understanding of suspension service procedures. K-Tech recommends fitting by an authorised K-Tech Service Centre.
Specifications
| Attribute | Detail |
|---|---|
| Part Number | FSS-007 |
| Inner Diameter | 41.00 mm |
| Outer Diameter | 54.00 mm |
| Height | 11.00 mm |
| Quantity | 2x oil seals (one pair) |
| Seal Manufacturer | NOK |
| Fitment | Triumph Street Triple 765 S / R / RS (2017–2026) |
What's includedEverything in the box▼
- 2x K-Tech fork oil seals for Triumph Street Triple 765 S / R / RS (2017–2026)
FitmentWhich bikes this fits▼
- Triumph Street Triple 765 S / R / RS (2017–2026)
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