Öhlins Piston 77.4/55.1The facts.
| Brand | Öhlins |
|---|---|
| Part Number | 21862-01 |
| Category | Pistons |
| Dimension A | 77.4 mm |
| Dimension B | 55.1 mm |
| Country of Origin | Sweden |
DescriptionThe whole story▼
Piston 77.4/55.1, Öhlins part number 21862-01. Öhlins machines its pistons rather than sintering them, which is why the port edges stay sharp.
Key Features
- Original Öhlins service part
- Dimension A 77.4 mm
- Dimension B 55.1 mm
- Öhlins part number 21862-01
Function
Dimensionally this is 77.4 mm, 55.1 mm, which is how it is told apart from the rest of the range. Öhlins machines the ports rather than casting them, so the edges stay sharp and the flow predictable. Port area sets how much oil can pass before the shims begin to lift. A worn piston band lets oil past the outside of the piston, which shows up as damping that has gone soft.
Why the Original
Öhlins manufactures service parts on the same lines as production parts — there is no second quality. The part is identical to what Öhlins fits in production — same supplier, same specification. Service parts are ordered per piece unless stated otherwise. If you are between two sizes, send us the measurement and we will check it against the catalogue.
Getting the Number Right
Öhlins identifies this position by the number 21862-01 in the exploded view for the unit it belongs to. Check dimension a 77.4 mm, dimension b 55.1 mm against what you have removed; a close size is not the same part. Twin-tube pistons have separate paths for compression and rebound, which is the whole point of the design. The piston carries the shim stacks and meters the oil; its port layout is what makes an Öhlins damper behave the way it does.
Fitting and Setup Service
Ask us about a full service: as an authorised Öhlins centre we strip, inspect, replace what is worn and set the unit back to its specification.
Specifications
- Brand: Öhlins
- Part Number: 21862-01
- Category: Pistons
- Dimension A: 77.4 mm
- Dimension B: 55.1 mm
- Country of Origin: Sweden
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