Öhlins Piston 39.95/15Öhlins Piston 39.95/15
02 · Data & docs

The facts.

Technical data
BrandÖhlins
Part Number21723-02
CategoryPistons
Dimension A39.95 mm
Dimension B15 mm
Country of OriginSweden
DescriptionThe whole story▼

Piston 39.95/15, Öhlins part number 21723-02. The piston carries the shim stacks and meters the oil through its ports.

Key Features

  • Original Öhlins service part
  • Dimension A 39.95 mm
  • Öhlins part number 21723-02
  • Dimension B 15 mm

What It Is

This one measures 39.95 mm, 15 mm, and those figures are what separate it from the neighbouring numbers. The piston carries the shim stacks and meters the oil through its ports. The seat face has to be flat enough for the first shim to seal against it. The piston carries the shim stacks and meters the oil; its port layout is what makes an Öhlins damper behave the way it does.

Original Öhlins Part

Öhlins keeps service parts available for units long after they leave the current price list. The part number is the contract: it defines material, dimension and finish together. Öhlins parts are unit-specific: a close dimension is not a substitute. Öhlins numbers do not follow a logic you can guess — always read them from the documentation.

Identifying the Right Part

Order under 21723-02. Where several sizes share a description, only the number separates them. The published dimensions are dimension a 39.95 mm, dimension b 15 mm — measure the old part against them if you are unsure. A check valve holds pressure in one direction and opens in the other; a worn one lets damping bleed away. Öhlins machines the ports rather than casting them, so the edges stay sharp and the flow predictable.

Fitting and Setup Service

If you would rather not open the damper yourself, we can do it — we are an authorised Öhlins service centre and rebuild these units as a matter of routine.

Specifications

  • Brand: Öhlins
  • Part Number: 21723-02
  • Category: Pistons
  • Dimension A: 39.95 mm
  • Dimension B: 15 mm
  • Country of Origin: Sweden
07 · Support

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