Öhlins Adaptor base valve M22x1/58
02 · Data & docs

The facts.

Technical data
BrandÖhlins
Part Number21758-09
CategoryValves
Dimension A1 mm
Dimension B58 mm
ThreadM22x1
Country of OriginSweden
DescriptionThe whole story▼

Adaptor base valve M22x1/58, Öhlins part number 21758-09. The piston carries the shim stacks and meters the oil; its port layout is what makes an Öhlins damper behave the way it does.

Key Features

  • Dimension A 1 mm
  • Original Öhlins service part
  • Thread M22x1
  • Öhlins part number 21758-09
  • Dimension B 58 mm

What It Is

Öhlins publishes 1 mm, 58 mm for 21758-09 — the dimensions are the identity of the part. Rebuilding a piston means keeping the shim order, because the stack is the tuning. Öhlins machines the ports rather than casting them, so the edges stay sharp and the flow predictable. The seat face has to be flat enough for the first shim to seal against it.

Why the Original

Suspension is one of the few areas where the original part is genuinely the cheaper decision. A damper that can be rebuilt is a damper that stays on the bike; that is the whole argument for original service parts. Service parts are ordered per piece unless stated otherwise. We can supply the whole position from the drawing rather than the single piece if that is easier.

How to Be Sure It Fits

The reliable route is the exploded drawing: find the position, read the number, order it — 21758-09 in this case. Öhlins states dimension a 1 mm, dimension b 58 mm for this number, and those figures are the deciding ones. Jets meter fixed bleed flow and are sized in tenths of a millimetre. Rebuilding a piston means keeping the shim order, because the stack is the tuning.

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: 21758-09
  • Category: Valves
  • Dimension A: 1 mm
  • Dimension B: 58 mm
  • Thread: M22x1
  • Country of Origin: Sweden
07 · Support

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08 · Paddock

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