Öhlins Shock Spring 21-29 N/mm / 260 mm / Ø 46 mm
02 · Data & docs

The facts.

Technical data
BrandÖhlins
Part Number66394-04
Spring Rate21-29 N/mm
Free Length260 mm
Inner Diameter46 mm
Stroke140 mm
ConstructionProg./Straight
FinishPowder-coated yellow
Country of OriginSweden
DescriptionThe whole story▼

Öhlins part number 66394-04 is a shock absorber spring rated at 21-29 N/mm, 260 mm long with a 46 mm inner diameter. A rear spring matched to rider and load keeps the chassis attitude where the factory intended it.

Key Features

  • Öhlins part number 66394-04
  • Free length 260 mm
  • Progressively wound
  • Inner diameter 46 mm
  • Measured spring rate 21-29 N/mm (progressive)
  • 140 mm of usable stroke
  • Powder-coated yellow

Manufacture and Tolerance

The unit is rebuildable: seals, shims and oil are catalogue items, not a reason to buy a new one. The wire is progressively wound where the application calls for it and straight where it does not. Öhlins sets a baseline for each part number on the machine it was developed on, so it works before anything is adjusted.

The Numbers That Matter

Dimensionally this is a 46 mm × 260 mm spring; within that envelope Öhlins offers a range of rates, and this one is 21-29 N/mm.

What the Rear Spring Decides

A spring that has settled in service sits shorter than new, which quietly lowers the bike and steepens the steering. Adding a pillion or luggage changes the rear load enough that the standard rate stops working properly. Progressive springs change rate through the stroke, which suits machines with little travel and a lot of load.

Applications

This is a service part in the proper sense — it wears, it settles, and replacing it restores what the suspension was designed to do. Selection is by measurement. If the diameter and free length match your fork, the remaining question is the rate. Öhlins offers rates in defined steps so a change can be made in one direction at a time rather than by guesswork.

What Fitting Involves

The springs come powder-coated and need no preparation before they go in. Both legs are done together, and both take the same rate. Work on both legs in one session so the fork stays symmetrical.

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 suspension rewards careful fitting. We recommend having the work done by an authorised Öhlins service centre — and we are one ourselves: we fit, service and set up Öhlins components in house. If you would like us to handle the installation, just ask and we will quote it with the order.

Specifications

  • Brand: Öhlins
  • Part Number: 66394-04
  • Spring Rate: 21-29 N/mm
  • Free Length: 260 mm
  • Inner Diameter: 46 mm
  • Stroke: 140 mm
  • Construction: Prog./Straight
  • Finish: Powder-coated yellow
  • Country of Origin: Sweden
FitmentWhich bikes this fits▼
    07 · Support

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    08 · Paddock

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