Öhlins Fork Springs 13.0 N/mm / 247 mm / Ø 31.5 mm
02 · Data & docs

The facts.

Technical data
BrandÖhlins
Part Number08421-13
Spring Rate13.0 N/mm
Free Length247 mm
Inner Diameter31.5 mm
Packaging UnitPair
Country of OriginSweden
DescriptionThe whole story▼

Öhlins part number 08421-13 is a pair of fork springs rated at 13.0 N/mm, 247 mm long with a 31.5 mm inner diameter. Getting the rate right restores the static sag the chassis was designed around.

Key Features

  • Inner diameter 31.5 mm
  • Measured spring rate 13.0 N/mm
  • Supplied as a pair
  • Free length 247 mm
  • Öhlins part number 08421-13

How Öhlins Makes Them

Machining, anodising, assembly and testing all happen in the same building rather than across a supply chain. The Öhlins part number is stamped on the unit, so its specification can be looked up years later. Production has stayed in Sweden since the company was founded in 1976.

The Numbers That Matter

At 247 mm free length and 31.5 mm inner diameter, this spring is dimensionally interchangeable with anything of the same size — the rate is what makes it a different part.

What This Rate Does

This is the stiff end of Öhlins' catalogue, chosen when fork dive rather than grip is the limiting factor. Very firm rates keep the chassis attitude stable when the brakes are used at their limit, at the cost of ride comfort. Heavy riders in full kit, or machines carrying substantial load, are the other case. A road machine spends most of its life in the first third of the fork's travel — that is the part the rate governs.

Applications

Sag figures, not feel, decide whether a rate is right. Öhlins publishes the targets for its own units. Nothing about the installation changes across a rate range: the mounting, the length and the bore stay the same. 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.

Fitting

Any suspension workshop can fit these; the fork does not need to leave the bike for long. Check the free length against the old springs before fitting — a sagged original often measures short. Note the original oil level before draining — it is a useful reference even when Öhlins specifies its own.

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

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: 08421-13
  • Spring Rate: 13.0 N/mm
  • Free Length: 247 mm
  • Inner Diameter: 31.5 mm
  • Packaging Unit: Pair
  • Country of Origin: Sweden
FitmentWhich bikes this fits▼
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