The facts.
| Brand | Öhlins |
|---|---|
| Part Number | 21092-36 |
| Spring Rate | 105 N/mm |
| Free Length | 175 mm |
| Inner Diameter | 51 mm |
| Country of Origin | Sweden |
DescriptionThe whole story▼
Öhlins part number 21092-36 is a shock absorber spring rated at 105 N/mm, 175 mm long with a 51 mm inner diameter. The damper can only control the spring it is given; the wrong rate makes every click a compromise.
Key Features
- Measured spring rate 105 N/mm
- Inner diameter 51 mm
- Öhlins part number 21092-36
- Free length 175 mm
How Öhlins Makes Them
The unit is rebuildable: seals, shims and oil are catalogue items, not a reason to buy a new one. Shafts are hardened and surface-treated so the seal has a consistent surface to run against. Anodising is hard-coat rather than decorative, which matters on a component exposed to road salt and stone chips.
The Numbers That Matter
Öhlins holds the free length at 175 mm and the inner diameter at 51 mm across this rate range, so moving up or down a rate changes nothing about the installation.
Where This Rate Belongs
Firm rates also suit machines carrying luggage as a matter of course. Firm rates trade some small-bump comfort for support — the right trade on a good surface at speed. This end of the range suits heavier riders, two-up use, or a machine ridden hard enough that fork dive becomes the limit. Ride quality on the road is decided by rate first and damping second.
How a Rear Spring Works
Adding a pillion or luggage changes the rear load enough that the standard rate stops working properly. A spring that has settled in service sits shorter than new, which quietly lowers the bike and steepens the steering. Rear spring rate sets ride height and static sag, and those two decide the chassis attitude before any damping click matters.
Applications
Where Öhlins lists this size against a particular unit, the listing is a starting point rather than a boundary. The safest way to choose is by static sag: set the target figure, and the rate follows from whether you can reach it with preload. There is no model list for this size because the spring is a dimensional part: it fits whatever fork it physically fits.
Installation
Note the original oil level before draining — it is a useful reference even when Öhlins specifies its own. Springs are supplied ready to fit; no cutting, grinding or packing is needed. Work on both legs in one session so the fork stays symmetrical.
Road Approval
Road approval: a spring is a like-for-like replacement of a wear part and carries no separate type approval. Where Öhlins states an approval for a particular motorcycle, it is named under Applications.
Fitting and Setup Service
Öhlins components deliver what they promise once they are fitted and set up properly. As an authorised Öhlins service centre we do exactly that in house — installation, service and setup. Simply ask if you would like us to take care of it.
Specifications
- Brand: Öhlins
- Part Number: 21092-36
- Spring Rate: 105 N/mm
- Free Length: 175 mm
- Inner Diameter: 51 mm
- Country of Origin: Sweden
FitmentWhich bikes this fits▼
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