The facts.
| Brand | Öhlins |
|---|---|
| Part Number | 21040-41 |
| Spring Rate | 115 N/mm |
| Free Length | 160 mm |
| Inner Diameter | 51 mm |
| Stroke | 73 mm |
| Construction | Straight |
| Finish | Powder-coated yellow |
| Country of Origin | Sweden |
DescriptionThe whole story▼
Öhlins part number 21040-41 is a shock absorber spring rated at 115 N/mm, 160 mm long with a 51 mm inner diameter. A rear spring matched to rider and load keeps the chassis attitude where the factory intended it.
Key Features
- Measured spring rate 115 N/mm
- Free length 160 mm
- Straight-wound, constant rate
- Inner diameter 51 mm
- 73 mm of usable stroke
- Powder-coated yellow
- Öhlins part number 21040-41
Why the Rate Holds
The unit is rebuildable: seals, shims and oil are catalogue items, not a reason to buy a new one. Öhlins machines its own critical components instead of buying them in, and the tolerances are where the money goes. Öhlins winds, heat-sets and then measures every spring individually — the rate on the label is the rate you get.
Size and Rate
At 160 mm free length and 51 mm inner diameter, this spring is dimensionally interchangeable with anything of the same size — the rate is what makes it a different part.
Where This Rate Belongs
This end of the range suits heavier riders, two-up use, or a machine ridden hard enough that fork dive becomes the limit. If the suspension bottoms out or the geometry collapses under load, this is the direction to go. Heavier riders, two-up use and track days all push the choice towards this end. Road surfaces are the hardest test of a spring rate, because the fork has to cope with both a smooth stretch and a broken one.
How a Rear Spring Works
Rear spring rate sets ride height and static sag, and those two decide the chassis attitude before any damping click matters. Öhlins supplies most of its shocks without a spring precisely so the rate can be matched to the rider rather than averaged. Two riders 20 kg apart on the same motorcycle genuinely need different rates, not different clicks.
Applications
A spring is one of the few suspension parts that is genuinely interchangeable: same bore, same free length, and it goes in. If you are replacing a sagged original, measure its free length first — a tired spring often measures several millimetres short. Selection is by measurement. If the diameter and free length match your fork, the remaining question is the rate.
What Fitting Involves
Springs are supplied ready to fit; no cutting, grinding or packing is needed. The fork legs come off, the springs are swapped and the oil level is reset — half a day in most workshops. Torque the fork caps to the manufacturer's figure; the springs change nothing about the assembly torque.
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
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: 21040-41
- Spring Rate: 115 N/mm
- Free Length: 160 mm
- Inner Diameter: 51 mm
- Stroke: 73 mm
- Construction: Straight
- Finish: Powder-coated yellow
- Country of Origin: Sweden
FitmentWhich bikes this fits▼
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