The facts.
| Brand | Öhlins |
|---|---|
| Part Number | 21907-01 |
| Category | Adjustment Housings |
| Dimension A | 1.5 mm |
| Dimension B | 17 mm |
| Thread | M33x1.5 |
| Country of Origin | Sweden |
DescriptionThe whole story▼
Adjustment housing M33x1.5/17, Öhlins part number 21907-01. The adjuster is the part a rider actually touches, and its detents are what make a setting repeatable.
Key Features
- Öhlins part number 21907-01
- Dimension A 1.5 mm
- Dimension B 17 mm
- Thread M33x1.5
- Original Öhlins service part
Where It Sits
Öhlins publishes 1.5 mm, 17 mm for 21907-01 — the dimensions are the identity of the part. A worn adjuster loses its clicks, and with them any chance of a methodical setup. Its bores hold seals, so a scored housing leaks as surely as a shaft seal. Electronically controlled adjusters replace the needle with a solenoid but keep the same hydraulics.
Why the Original
Öhlins manufactures service parts on the same lines as production parts — there is no second quality. Öhlins keeps service parts available for units long after they leave the current price list. For a full rebuild, the seal kit plus the wear parts is usually the sensible order. Where a number has been superseded, Öhlins states the replacement — we pass that on.
Identifying the Right Part
The reliable route is the exploded drawing: find the position, read the number, order it — 21907-01 in this case. Check dimension a 1.5 mm, dimension b 17 mm against what you have removed; a close size is not the same part. Öhlins builds click adjusters with defined detents so a setting can be written down and returned to. Its bores hold seals, so a scored housing leaks as surely as a shaft seal.
Fitting and Setup Service
We are an authorised Öhlins service centre, so you do not have to source the tools and the nitrogen: send us the damper and we rebuild it with the correct parts and the correct setting.
Specifications
- Brand: Öhlins
- Part Number: 21907-01
- Category: Adjustment Housings
- Dimension A: 1.5 mm
- Dimension B: 17 mm
- Thread: M33x1.5
- Country of Origin: Sweden
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