The facts.
| Brand | Öhlins |
|---|---|
| Part Number | 21933-04 |
| Category | Adjustment Housings |
| Dimension A | 1 mm |
| Dimension B | 53.5 mm |
| Dimension C | 24 mm |
| Thread | M50x1 |
| Country of Origin | Sweden |
DescriptionThe whole story▼
Adjustment housing M50x1/53.5/24, Öhlins part number 21933-04. Needle and seat together meter the bleed flow; damage to either changes the whole adjustment range.
Key Features
- Öhlins part number 21933-04
- Dimension C 24 mm
- Thread M50x1
- Original Öhlins service part
- Dimension A 1 mm
- Dimension B 53.5 mm
Function
Öhlins publishes 1 mm, 53.5 mm, 24 mm for 21933-04 — the dimensions are the identity of the part. Öhlins builds click adjusters with defined detents so a setting can be written down and returned to. The adjuster is the part a rider actually touches, and its detents are what make a setting repeatable. Thread size identifies where it belongs on the unit.
Original Öhlins Part
The tolerances here are the ones the unit was assembled to, not a pattern equivalent's interpretation of them. Parts remain available years after a unit leaves the current price list, which is unusual in this trade. If the unit is already apart, compare the published dimensions with the part in your hand. If you are between two sizes, send us the measurement and we will check it against the catalogue.
Getting the Number Right
21933-04 is the Öhlins number for this position — the same one printed in the service documentation. Öhlins states dimension a 1 mm, dimension b 53.5 mm, dimension c 24 mm for this number, and those figures are the deciding ones. Preload adjusters carry the full spring force and are built accordingly. The needle tip is the wear part: once rounded, the first few clicks stop doing anything.
Fitting and Setup Service
If you would rather not open the damper yourself, we can do it — we are an authorised Öhlins service centre and rebuild these units as a matter of routine.
Specifications
- Brand: Öhlins
- Part Number: 21933-04
- Category: Adjustment Housings
- Dimension A: 1 mm
- Dimension B: 53.5 mm
- Dimension C: 24 mm
- Thread: M50x1
- Country of Origin: Sweden
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