Öhlins Cylinder tube 25/28/237
02 · Data & docs

The facts.

Technical data
BrandÖhlins
Part Number21929-01
CategoryCylinder Tubes
Diameter25 mm
Length28 mm
Country of OriginSweden
DescriptionThe whole story▼

Cylinder tube 25/28/237, Öhlins part number 21929-01. A scored bore means lost damping, because the oil bypasses the piston rather than being forced through the shims.

Key Features

  • Original Öhlins service part
  • Length 28 mm
  • Öhlins part number 21929-01
  • Diameter 25 mm

What It Is

Öhlins gives it as 25 mm, 28 mm; nothing about that is approximate. Öhlins turns and hones each tube to a defined roundness, because an out-of-round bore leaks past the piston. Öhlins matches tube and piston as a pair during assembly, which is why the part numbers are specific. The cylinder tube is the working bore: the piston runs inside it and every damping force is reacted by its wall.

Why the Original

Every part in this catalogue is one Öhlins fits itself during assembly and service. Öhlins publishes dimensions for its service parts so a workshop can verify before it fits. Öhlins parts are unit-specific: a close dimension is not a substitute. The Öhlins exploded view names the number for each position; we can look it up if you do not have it.

Identifying the Right Part

Öhlins identifies this position by the number 21929-01 in the exploded view for the unit it belongs to. Öhlins states diameter 25 mm, length 28 mm for this number, and those figures are the deciding ones. The tube is what the whole damper is built around: everything else references its bore. Öhlins gives the tube its diameter and its working length as a pair — a tube of the same bore but different length belongs to a different unit.

Fitting and Setup Service

A damper rebuild is workshop work: it needs the unit dismantled, the shim stack rebuilt in the correct order and the gas charge reset. We are an authorised Öhlins service centre and do exactly that in house — send us the unit or ask us to fit the part with your order.

Specifications

  • Brand: Öhlins
  • Part Number: 21929-01
  • Category: Cylinder Tubes
  • Diameter: 25 mm
  • Length: 28 mm
  • Country of Origin: Sweden
07 · Support

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