The facts.
| Brand | Öhlins |
|---|---|
| Part Number | 66420-030 |
| Spring Rate | 30 N/mm |
| Free Length | 200 mm |
| Inner Diameter | 46 mm |
| Country of Origin | Sweden |
DescriptionThe whole story▼
Öhlins part number 66420-030 is a shock absorber spring rated at 30 N/mm, 200 mm long with a 46 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 30 N/mm
- Inner diameter 46 mm
- Free length 200 mm
- Öhlins part number 66420-030
Manufacture and Tolerance
The wire is progressively wound where the application calls for it and straight where it does not. Machining, anodising, assembly and testing all happen in the same building rather than across a supply chain. Every Öhlins dealer can re-valve the unit, because the shim stack is a documented, serviceable assembly.
Dimensions
At 200 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.
Where This Rate Belongs
Rates in this range suit lighter riders and machines that spend their time on real roads rather than smooth circuits. Lighter riders usually end up a step or two below the factory rate once sag is measured properly. A soft rate favours grip and comfort over support: the fork moves early, which keeps the tyre loaded on a poor surface. A road machine spends most of its life in the first third of the fork's travel — that is the part the rate governs.
How a Rear Spring Works
Adding a pillion or luggage changes the rear load enough that the standard rate stops working properly. The rear spring carries the rider, the pillion and the luggage; the front carries only part of it. The damper can only control the spring it is given; the wrong rate makes every setting a compromise.
Applications
Öhlins offers rates in defined steps so a change can be made in one direction at a time rather than by guesswork. If you are replacing a sagged original, measure its free length first — a tired spring often measures several millimetres short. This spring is chosen by its dimensions rather than by motorcycle model: check inner diameter, free length and rate against the fork it is going into.
Installation
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 part numbers are stamped on the packaging rather than the spring, so keep the label with the setup notes.
Road Approval
Road approval: springs are not separately type-approved in Germany because they substitute a part that is already homologated with the fork. Model-specific documents, where they exist, are named above.
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: 66420-030
- Spring Rate: 30 N/mm
- Free Length: 200 mm
- Inner Diameter: 46 mm
- Country of Origin: Sweden
FitmentWhich bikes this fits▼
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