The facts.
| Brand | Öhlins |
|---|---|
| Part Number | 21040-49 |
| Spring Rate | 130 N/mm |
| Free Length | 160 mm |
| Inner Diameter | 51 mm |
| Stroke | 72 mm |
| Construction | Straight |
| Finish | Powder-coated yellow |
| Country of Origin | Sweden |
DescriptionThe whole story▼
Öhlins part number 21040-49 is a shock absorber spring rated at 130 N/mm, 160 mm long with a 51 mm inner diameter. Rear spring rate sets ride height, static sag and how much of the damper's stroke is actually usable.
Key Features
- Measured spring rate 130 N/mm
- Powder-coated yellow
- Inner diameter 51 mm
- Free length 160 mm
- 72 mm of usable stroke
- Straight-wound, constant rate
- Öhlins part number 21040-49
Why the Rate Holds
Production is Öhlins' own in Sweden, and the tolerance on the rate is what separates these from a generic replacement. Öhlins sets a baseline for each part number on the machine it was developed on, so it works before anything is adjusted. The Öhlins part number is stamped on the unit, so its specification can be looked up years later.
Size and Rate
Free length 160 mm, inner diameter 51 mm, rate 130 N/mm — those three figures define the part completely.
What This Rate Does
Firm rates trade some small-bump comfort for support — the right trade on a good surface at speed. Firm rates also suit machines carrying luggage as a matter of course. If the suspension bottoms out or the geometry collapses under load, this is the direction to go. A road machine spends most of its life in the first third of the fork's travel — that is the part the rate governs.
What the Rear Spring Decides
The rear spring carries the rider, the pillion and the luggage; the front carries only part of it. Rear spring rates run in the tens or hundreds of N/mm because the spring sits at the short end of that lever, not at the wheel. Adding a pillion or luggage changes the rear load enough that the standard rate stops working properly.
Applications
Any workshop with the fork or shock in front of it can answer whether this spring fits — the three figures above are all it needs. This is a service part in the proper sense — it wears, it settles, and replacing it restores what the suspension was designed to do. If you are replacing a sagged original, measure its free length first — a tired spring often measures several millimetres short.
What Fitting Involves
Fitting is a fork-oil job: the legs come apart, the springs go in, the oil level is set to specification. The job needs no special tools beyond a fork spring compressor and a measuring rod for the oil level. Any suspension workshop can fit these; the fork does not need to leave the bike for long.
Road Approval
Road approval: no separate certificate. The spring changes the rate, not the construction of the fork, and is treated as a service part.
Fitting and Setup Service
We are an authorised Öhlins service centre, so the installation does not have to be your problem: we fit and set up Öhlins components in our own workshop. Ask us when you order and we will include the work.
Specifications
- Brand: Öhlins
- Part Number: 21040-49
- Spring Rate: 130 N/mm
- Free Length: 160 mm
- Inner Diameter: 51 mm
- Stroke: 72 mm
- Construction: Straight
- Finish: Powder-coated yellow
- Country of Origin: Sweden
FitmentWhich bikes this fits▼
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