Öhlins Fork Springs 5.1 N/mm / 471 mm / Ø 34.4 mm
02 · Data & docs

The facts.

Technical data
BrandÖhlins
Part Number08431-51
Spring Rate5.1 N/mm
Free Length471 mm
Inner Diameter34.4 mm
PositionVorne
ConstructionStraight
Packaging UnitPair
Country of OriginSweden
DescriptionThe whole story▼

Öhlins part number 08431-51 is a pair of fork springs rated at 5.1 N/mm, 471 mm long and 34.4 mm inner diameter. Factory fork springs are chosen for an average rider on an average road; few riders are either.

Key Features

  • Straight-wound, constant rate
  • Measured spring rate 5.1 N/mm
  • Inner diameter 34.4 mm
  • Öhlins part number 08431-51
  • Supplied as a pair
  • Free length 471 mm

Manufacture and Tolerance

The finish is applied after setting, which means the coating does not affect the rate. The unit is rebuildable: seals, shims and oil are catalogue items, not a reason to buy a new one. Rates are offered in defined steps, so a change can be made in one direction at a time.

Applications

Öhlins lists this spring for Honda CRF250R (2015–2017), Honda CRF250R (2015–2017). The list says where Öhlins has confirmed the fit; it does not exclude a fork of the same dimensions.

Dimensions

At 471 mm free length and 34.4 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. This is the end of the range where small-bump compliance matters more than resistance to diving. Off-road forks work through their whole travel on every lap, and the spring is what decides where in that travel the bike sits.

Installation

Öhlins supplies a setting sheet with the springs; the numbers on it assume the specified oil. Öhlins states the oil and the air-gap for this application — both are part of the setting, not a detail. The springs come powder-coated and need no preparation before they go in.

Road Approval

Road approval: none is issued for springs as such — they replace an existing component of the same function. Any model-specific approval is listed under Applications.

Important Notes

  • Fork spring set — fits the Öhlins FGHO 1793 cartridge kit only.

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: 08431-51
  • Spring Rate: 5.1 N/mm
  • Free Length: 471 mm
  • Inner Diameter: 34.4 mm
  • Position: Vorne
  • Construction: Straight
  • Packaging Unit: Pair
  • Country of Origin: Sweden
FitmentWhich bikes this fits▼
  • Honda CRF250R (2015–2017)
  • Honda CRF250R (2015–2017)
07 · Support

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08 · Paddock

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