Öhlins Piston 21/10Öhlins Piston 21/10
02 · Data & docs

The facts.

Technical data
BrandÖhlins
Part Number21723-01
CategoryPistons
Dimension A21 mm
Dimension B10 mm
Country of OriginSweden
DescriptionThe whole story▼

Piston 21/10, Öhlins part number 21723-01. Port area sets how much oil can pass before the shims begin to lift.

Key Features

  • Original Öhlins service part
  • Dimension B 10 mm
  • Dimension A 21 mm
  • Öhlins part number 21723-01

Function

Dimensionally this is 21 mm, 10 mm, which is how it is told apart from the rest of the range. A check valve holds pressure in one direction and opens in the other; a worn one lets damping bleed away. Port area sets how much oil can pass before the shims begin to lift. Öhlins machines the ports rather than casting them, so the edges stay sharp and the flow predictable.

Original Öhlins Part

An original part keeps the unit within its published specification; a near-equivalent quietly moves it. Öhlins publishes dimensions for its service parts so a workshop can verify before it fits. Order by part number. The dimensions below are the ones Öhlins publishes for it. Tell us the damper's model designation and year and we will match the number for you.

Identifying the Right Part

If the unit is already open, compare the dimensions below with the part in your hand before ordering 21723-01. Check dimension a 21 mm, dimension b 10 mm against what you have removed; a close size is not the same part. Port area sets how much oil can pass before the shims begin to lift. Port area and shim seat geometry decide the damping curve before any adjuster is touched.

Fitting and Setup Service

Fitting service parts means opening a pressurised unit. As an authorised Öhlins service centre we do that here, with the right tools and a dyno check afterwards — just ask.

Specifications

  • Brand: Öhlins
  • Part Number: 21723-01
  • Category: Pistons
  • Dimension A: 21 mm
  • Dimension B: 10 mm
  • Country of Origin: Sweden
07 · Support

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08 · Paddock

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