The facts.
| Brand | Öhlins |
|---|---|
| Part Number | 66420-028 |
| Spring Rate | 28 N/mm |
| Free Length | 200 mm |
| Inner Diameter | 46 mm |
| Country of Origin | Sweden |
DescriptionThe whole story▼
Öhlins part number 66420-028 is a shock absorber spring rated at 28 N/mm, 200 mm long with a 46 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 66420-028
- Free length 200 mm
- Measured spring rate 28 N/mm
- Inner diameter 46 mm
How Öhlins Makes Them
Every Öhlins dealer can re-valve the unit, because the shim stack is a documented, serviceable assembly. Materials read unremarkably on paper — aluminium, steel, nitrogen — and the difference lies in how precisely they are made. Öhlins winds, heat-sets and then measures every spring individually — the rate on the label is the rate you get.
Dimensions
Dimensionally this is a 46 mm × 200 mm spring; within that envelope Öhlins offers a range of rates, and this one is 28 N/mm.
What This Rate Does
Rates in this range suit lighter riders and machines that spend their time on real roads rather than smooth circuits. Comfort and grip come from the spring moving early; this is the end of the range where that happens. A softer rate keeps the tyre loaded on a poor surface, which is worth more than outright support on most roads. 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
Öhlins supplies most of its shocks without a spring precisely so the rate can be matched to the rider rather than averaged. A spring that has settled in service sits shorter than new, which quietly lowers the bike and steepens the steering. Adding a pillion or luggage changes the rear load enough that the standard rate stops working properly.
Applications
The safest way to choose is by static sag: set the target figure, and the rate follows from whether you can reach it with preload. Where Öhlins lists this size against a particular unit, the listing is a starting point rather than a boundary. This is a service part in the proper sense — it wears, it settles, and replacing it restores what the suspension was designed to do.
What Fitting Involves
Check the free length against the old springs before fitting — a sagged original often measures short. Preload spacers usually need shortening or lengthening so the installed length stays correct. Both legs are done together, and both take the same rate.
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
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: 66420-028
- Spring Rate: 28 N/mm
- Free Length: 200 mm
- Inner Diameter: 46 mm
- Country of Origin: Sweden
FitmentWhich bikes this fits▼
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