The facts.
| Brand | Öhlins |
|---|---|
| Part Number | 01091-29 |
| Spring Rate | 90 N/mm |
| Free Length | 160 mm |
| Inner Diameter | 57 mm |
| Stroke | 78 mm |
| Construction | Straight |
| Finish | Powder-coated yellow |
| Country of Origin | Sweden |
DescriptionThe whole story▼
Öhlins part number 01091-29 is a shock absorber spring rated at 90 N/mm, 160 mm long with a 57 mm inner diameter. A rear spring matched to rider and load keeps the chassis attitude where the factory intended it.
Key Features
- Öhlins part number 01091-29
- Free length 160 mm
- 78 mm of usable stroke
- Inner diameter 57 mm
- Powder-coated yellow
- Straight-wound, constant rate
- Measured spring rate 90 N/mm
Manufacture and Tolerance
Each spring is set before it is measured, so it will not settle and lose rate in service. Öhlins sets a baseline for each part number on the machine it was developed on, so it works before anything is adjusted. Shafts are hardened and surface-treated so the seal has a consistent surface to run against.
The Numbers That Matter
Öhlins holds the free length at 160 mm and the inner diameter at 57 mm across this rate range, so moving up or down a rate changes nothing about the installation.
Choosing 90 N/mm
Firm rates trade some small-bump comfort for support — the right trade on a good surface at speed. If the suspension bottoms out or the geometry collapses under load, this is the direction to go. Firm rates also suit machines carrying luggage as a matter of course. Ride quality on the road is decided by rate first and damping second.
How a Rear Spring Works
Static sag at the rear sets the whole chassis attitude — get it wrong and the front geometry goes with it. Preload adjusts sag within a rate; it does not change the rate, and no amount of it will rescue a spring that is wrong. Adding a pillion or luggage changes the rear load enough that the standard rate stops working properly.
Applications
Nothing about the installation changes across a rate range: the mounting, the length and the bore stay the same. A spring is one of the few suspension parts that is genuinely interchangeable: same bore, same free length, and it goes in. Öhlins offers rates in defined steps so a change can be made in one direction at a time rather than by guesswork.
Installation
Öhlins supplies a setting sheet with the springs; the numbers on it assume the specified oil. If the fork has not been serviced recently, bushes and seals are worth replacing while it is apart. Note the original oil level before draining — it is a useful reference even when Öhlins specifies its own.
Road Approval
Road approval: none is issued for springs as such — they replace an existing component of the same function. Any model-specific approval is listed under Applications.
Fitting and Setup Service
This is not a part to rush. Öhlins recommends installation by an authorised service centre, and we are an authorised Öhlins service centre — fitting, servicing and setup all happen here. Get in touch if you would like the work done with the order.
Specifications
- Brand: Öhlins
- Part Number: 01091-29
- Spring Rate: 90 N/mm
- Free Length: 160 mm
- Inner Diameter: 57 mm
- Stroke: 78 mm
- Construction: Straight
- Finish: Powder-coated yellow
- Country of Origin: Sweden
FitmentWhich bikes this fits▼
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