The facts.
| Brand | Öhlins |
|---|---|
| Part Number | 21045-01 |
| Category | Check Valves |
| Country of Origin | Sweden |
DescriptionThe whole story▼
Check valve shim 0.25, Öhlins part number 21045-01. A check valve lets oil refill the working chamber without passing the shim stack.
Key Features
- Öhlins part number 21045-01
- Original Öhlins service part
Where It Sits
This position is identified by its number rather than by a dimension. A scored piston face means oil bypasses the shims entirely. The seat face has to be flat enough for the first shim to seal against it. Rebuilding a piston means keeping the shim order, because the stack is the tuning.
Genuine Service Part
Rebuilding to specification only works if the parts are to specification — that starts here. This is an original Öhlins part, not an aftermarket equivalent — the tolerances are the ones the unit was assembled to. Tell us the damper's model designation and year and we will match the number for you. Send us the model and serial number of your unit and we will confirm the position before you order.
Identifying the Right Part
21045-01 is the Öhlins number for this position — the same one printed in the service documentation. Where no measurement is given, the drawing position is what identifies the part. Öhlins uses a piston band rather than metal-to-metal contact, which is what keeps the bore intact. Öhlins uses a light spring so the valve reacts to shaft speed rather than to pressure alone.
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: 21045-01
- Category: Check Valves
- Country of Origin: Sweden
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