The facts.
| Brand | Öhlins |
|---|---|
| Part Number | 08437-45 |
| Spring Rate | 4.5 N/mm |
| Free Length | 455 mm |
| Inner Diameter | 43.6 mm |
| Packaging Unit | Pair |
| Country of Origin | Sweden |
DescriptionThe whole story▼
Öhlins part number 08437-45 is a pair of fork springs rated at 4.5 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
- Inner diameter 43.6 mm
- Öhlins part number 08437-45
- Measured spring rate 4.5 N/mm
- Supplied as a pair
- Free length 455 mm
Why the Rate Holds
Every unit is dyno-tested against the curve held for its part number, not sampled from a batch. Service parts stay available for years after a part number leaves the current price list. The wire is progressively wound where the application calls for it and straight where it does not.
Size and Rate
Dimensionally this is a 43.6 mm × 455 mm spring; within that envelope Öhlins offers a range of rates, and this one is 4.5 N/mm.
Choosing 4.5 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. Rates at this end are for long travel, light riders, or machines that need the wheel to follow the ground rather than skip over it. 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
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. This is a service part in the proper sense — it wears, it settles, and replacing it restores what the suspension was designed to do. Öhlins lists no fixed model here — the spring is defined by its measurements, and any fork with matching dimensions can take it.
Installation
The springs come powder-coated and need no preparation before they go in. Note the original oil level before draining — it is a useful reference even when Öhlins specifies its own. Set static sag after fitting; the rate is only right if the sag figure lands where Öhlins specifies.
Road Approval
Road approval: a spring is a like-for-like replacement of a wear part and carries no separate type approval. Where Öhlins states an approval for a particular motorcycle, it is named under Applications.
Fitting and Setup Service
Öhlins recommends that its suspension is fitted by an authorised service centre. We are one, and we do the work here: installation, servicing and a proper setup. Ask us and we will include it with the order.
Specifications
- Brand: Öhlins
- Part Number: 08437-45
- Spring Rate: 4.5 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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