The facts.
| Brand | Öhlins |
|---|---|
| Part Number | 00181-05 |
| Spring Rate | 30 N/mm |
| Free Length | 180 mm |
| Inner Diameter | 46 mm |
| Stroke | 110 mm |
| Construction | Straight |
| Finish | Powder-coated black |
| Country of Origin | Sweden |
DescriptionThe whole story▼
Öhlins part number 00181-05 is a shock absorber spring rated at 30 N/mm, 180 mm long with a 46 mm inner diameter. Rear spring rate sets ride height, static sag and how much of the damper's stroke is actually usable.
Key Features
- Powder-coated black
- 110 mm of usable stroke
- Straight-wound, constant rate
- Measured spring rate 30 N/mm
- Free length 180 mm
- Inner diameter 46 mm
- Öhlins part number 00181-05
Why the Rate Holds
The finish is applied after setting, which means the coating does not affect the rate. Two units carrying the same part number behave the same way out of the box, which is the whole point of testing each one. Anodising is hard-coat rather than decorative, which matters on a component exposed to road salt and stone chips.
Dimensions
At 180 mm free length and 46 mm inner diameter, this spring is dimensionally interchangeable with anything of the same size — the rate is what makes it a different part.
Choosing 30 N/mm
Lighter riders usually end up a step or two below the factory rate once sag is measured properly. On a machine ridden solo and mostly on the road, softer is often the honest choice. Rates in this range suit lighter riders and machines that spend their time on real roads rather than smooth circuits. Ride quality on the road is decided by rate first and damping second.
What the Rear Spring Decides
A shock absorber spring carries the whole rear of the machine through a linkage that multiplies its rate several times over — which is why the number on the spring looks so much larger than a fork rate. Two riders 20 kg apart on the same motorcycle genuinely need different rates, not different clicks. Adding a pillion or luggage changes the rear load enough that the standard rate stops working properly.
Applications
Öhlins builds springs to dimensions rather than to model lists, so the question is always the same: does the diameter fit, does the length fit, and is the rate right for the rider? Rate is the variable that depends on the rider, not on the machine. Two people on the same bike may well want two different numbers. Rather than a model list, use the measurements: a fork that accepts this diameter and length is a candidate, and the rate follows from rider weight.
Fitting
Spring preload spacers may need adjusting to keep the installed length correct. Fork oil should be replaced at the same time — it is already out of the leg. Öhlins states the oil and the air-gap for this application — both are part of the setting, not a detail.
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
Fitting matters as much as the part. We are an authorised Öhlins service centre and carry out installation, servicing and setup ourselves — get in touch and we will arrange it alongside your order.
Specifications
- Brand: Öhlins
- Part Number: 00181-05
- Spring Rate: 30 N/mm
- Free Length: 180 mm
- Inner Diameter: 46 mm
- Stroke: 110 mm
- Construction: Straight
- Finish: Powder-coated black
- Country of Origin: Sweden
FitmentWhich bikes this fits▼
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