Öhlins Fork Springs 9.0 N/mm / 270 mm / Ø 23.5 mm
02 · Data & docs

The facts.

Technical data
BrandÖhlins
Part Number08429-90
Spring Rate9.0 N/mm
Free Length270 mm
Inner Diameter23.5 mm
Stroke146 mm
ConstructionStraight
Packaging UnitPair
Country of OriginSweden
DescriptionThe whole story▼

Öhlins part number 08429-90 is a pair of fork springs rated at 9.0 N/mm, 270 mm long with a 23.5 mm inner diameter. A fork that is sprung wrong uses up its travel before the damping has a chance to work.

Key Features

  • Supplied as a pair
  • Measured spring rate 9.0 N/mm
  • 146 mm of usable stroke
  • Straight-wound, constant rate
  • Inner diameter 23.5 mm
  • Öhlins part number 08429-90
  • Free length 270 mm

Manufacture and Tolerance

Öhlins sets a baseline for each part number on the machine it was developed on, so it works before anything is adjusted. Two units carrying the same part number behave the same way out of the box, which is the whole point of testing each one. The unit is rebuildable: seals, shims and oil are catalogue items, not a reason to buy a new one.

Dimensions

The 23.5 mm bore and 270 mm length are the two figures that decide whether it physically fits; 9.0 N/mm decides whether it suits the rider.

What This Rate Does

From here it is easy to move one step in either direction once you have ridden it. If you are unsure and close to average weight in full kit, this is the sensible starting point. Rates here suit a solo rider of typical weight on a road-going machine. 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

Öhlins lists no fixed model here — the spring is defined by its measurements, and any fork with matching dimensions can take it. Rate is the variable that depends on the rider, not on the machine. Two people on the same bike may well want two different numbers. 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.

Installation

Öhlins states the oil and the air-gap for this application — both are part of the setting, not a detail. Oil level is measured from the top of the tube with the fork compressed and the spring removed. Springs are supplied ready to fit; no cutting, grinding or packing is needed.

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

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: 08429-90
  • Spring Rate: 9.0 N/mm
  • Free Length: 270 mm
  • Inner Diameter: 23.5 mm
  • Stroke: 146 mm
  • Construction: Straight
  • Packaging Unit: Pair
  • Country of Origin: Sweden
FitmentWhich bikes this fits▼
    07 · Support

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    08 · Paddock

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