The facts.
| Brand | Öhlins |
|---|---|
| Part Number | 00338-15 |
| Category | O-Rings |
| Inner Diameter | 18.77 mm |
| Cross Section | 1.78 mm |
| Material | NBR 70 |
| Country of Origin | Sweden |
DescriptionThe whole story▼
O-ring 18.77x1.78 NBR70, Öhlins part number 00338-15. A ring that has taken a set no longer springs back and starts to weep under pressure.
Key Features
- Cross Section 1.78 mm
- Öhlins part number 00338-15
- Material NBR 70
- Original Öhlins service part
- Inner Diameter 18.77 mm
Where It Sits
Öhlins gives it as 18.77 mm, 1.78 mm, NBR 70; nothing about that is approximate. Replacing seals at service intervals is far cheaper than replacing what a failed seal damages. A leaking damper is not a cosmetic problem: it is a damper that has stopped controlling the wheel. A ring that has taken a set no longer springs back and starts to weep under pressure.
Why the Original
Öhlins numbers every position so a workshop can order precisely what it needs, not a whole assembly. Öhlins supports its suspension with individual service parts, which is why a fifteen-year-old damper can still be rebuilt to specification. The Öhlins exploded view names the number for each position; we can look it up if you do not have it. Service parts are ordered per piece unless stated otherwise.
Identifying the Right Part
The reliable route is the exploded drawing: find the position, read the number, order it — 00338-15 in this case. Check inner diameter 18.77 mm, cross section 1.78 mm, material NBR 70 against what you have removed; a close size is not the same part. Seals are the part of a damper that decides whether it holds its gas charge and its oil, and they are the usual reason a unit ends up on the bench. Nitrile, Viton and PTFE behave differently with temperature, and Öhlins picks per position.
Fitting and Setup Service
A damper rebuild is workshop work: it needs the unit dismantled, the shim stack rebuilt in the correct order and the gas charge reset. We are an authorised Öhlins service centre and do exactly that in house — send us the unit or ask us to fit the part with your order.
Specifications
- Brand: Öhlins
- Part Number: 00338-15
- Category: O-Rings
- Inner Diameter: 18.77 mm
- Cross Section: 1.78 mm
- Material: NBR 70
- Country of Origin: Sweden
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