The facts.
| Brand | Öhlins |
|---|---|
| Part Number | 08437-39 |
| Spring Rate | 3.9 N/mm |
| Free Length | 455 mm |
| Inner Diameter | 43.6 mm |
| Packaging Unit | Pair |
| Country of Origin | Sweden |
DescriptionThe whole story▼
Öhlins part number 08437-39 is a pair of fork springs rated at 3.9 N/mm, 455 mm long with a 43.6 mm inner diameter. Factory fork springs are chosen for an average rider on an average road; few riders are either.
Key Features
- Free length 455 mm
- Supplied as a pair
- Measured spring rate 3.9 N/mm
- Öhlins part number 08437-39
- Inner diameter 43.6 mm
How Öhlins Makes Them
The finish is applied after setting, which means the coating does not affect the rate. Shafts are hardened and surface-treated so the seal has a consistent surface to run against. Seals are specified for temperature stability rather than for the lowest unit cost.
Dimensions
Free length 455 mm, inner diameter 43.6 mm, rate 3.9 N/mm — those three figures define the part completely.
Choosing 3.9 N/mm
A rate this low belongs on a long-travel machine or under a light rider — it lets the fork use its full stroke instead of riding high and skating over the surface. If the bike rides high and feels harsh over small stuff, the rate is often the reason rather than the damping. A very soft rate uses more of the stroke, which is usually what an off-road chassis wants. 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.
Applications
Ask us with the machine and rider weight and we will tell you which rate in this size to take. 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? Öhlins offers rates in defined steps so a change can be made in one direction at a time rather than by guesswork.
Fitting
The job needs no special tools beyond a fork spring compressor and a measuring rod for the oil level. Öhlins part numbers are stamped on the packaging rather than the spring, so keep the label with the setup notes. Öhlins states an air gap for this application, and that figure is part of the setting rather than a detail.
Road Approval
Road approval: not applicable to the spring on its own. Öhlins issues approvals against complete suspension units, not individual springs.
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: 08437-39
- Spring Rate: 3.9 N/mm
- Free Length: 455 mm
- Inner Diameter: 43.6 mm
- Packaging Unit: Pair
- Country of Origin: Sweden
FitmentWhich bikes this fits▼
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