Öhlins Seal head 42.5The facts.
| Brand | Öhlins |
|---|---|
| Part Number | 21754-05 |
| Category | Seal Heads |
| Country of Origin | Sweden |
DescriptionThe whole story▼
Seal head 42.5, Öhlins part number 21754-05. Assembly grease matters — the wrong compound swells the seal and it fails early.
Key Features
- Öhlins part number 21754-05
- Original Öhlins service part
Function
Öhlins publishes no separate dimension for this position, so the part number carries the identity. Head diameter and thread are specific to the tube it closes. Replacing seals at service intervals is far cheaper than replacing what a failed seal damages. Static seals and dynamic seals are not interchangeable even in the same size.
Genuine Service Part
Parts remain available years after a unit leaves the current price list, which is unusual in this trade. The part is identical to what Öhlins fits in production — same supplier, same specification. We can check the number against the Öhlins exploded view before you order — just ask. Service parts are ordered per piece unless stated otherwise.
How to Be Sure It Fits
If the unit is already open, compare the dimensions below with the part in your hand before ordering 21754-05. Where no measurement is given, the drawing position is what identifies the 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. An oil seal that has hardened lets the shaft pass oil past it, and the damping fades long before the leak becomes visible.
Fitting and Setup Service
Öhlins recommends that its units are serviced by an authorised centre. We are one: rebuild, revalve and setup all happen in our own workshop.
Specifications
- Brand: Öhlins
- Part Number: 21754-05
- Category: Seal Heads
- Country of Origin: Sweden
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Measure your head circumference about one centimetre above your eyebrows and compare it with the size chart on this page. Between sizes? Choose the smaller one — the padding beds in with use.
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Take out the washable lining and hand-wash it in lukewarm water. Clean the shell and visor with a soft cloth and water only — never solvents.
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