Öhlins STX 46 Blackline Shock Absorber BMW R NINET PURE (2016–2020) – view 2⟲ 360° — drag me
02 · Data & docs

The facts.

Technical data
BrandÖhlins
Part NumberBM 491
FitmentBMW R NINET PURE (2016–2020)
Road ApprovalABE (Germany)
Mounting PositionHinten
Length374 +10 / -2 mm
Stroke53 mm
Spring Rate140 N/
Piston Diameter46 mm
Spring Part Number21102-54
DescriptionThe whole story▼

The BMW R NINET PURE of 2016–2020 has its own Öhlins part number, and this is it: BM 491. The difference shows up in the second half of a fast road, when the standard unit has warmed through.

Key Features

  • Öhlins spring 21102-54 included
  • 53 mm of travel at the damper
  • Built to 374 +10 / -2 mm installed length
  • Monotube damper layout
  • Spring rate as delivered: 140 N/mm, matched to the R NINET PURE
  • Adjustable overall length for ride-height and geometry changes
  • Gas-pressurised monotube damper with the reservoir integrated into the body
  • Built for the BMW R NINET PURE (2016–2020); fits without modification

About the STX 46 Blackline Range

Riders choose it when a gold shock would sit wrong against the bike's own colours, and it costs the same as the standard finish. Because it is the same unit underneath, servicing, spares and re-valving are identical to the standard STX 46. The 46 mm piston and the integrated reservoir carry over unchanged from the standard version.

How Öhlins Builds It

Production has stayed in Sweden since the company was founded in 1976. Anodising is hard-coat rather than decorative, which matters on a component exposed to road salt and stone chips. Öhlins sets a baseline for each part number on the machine it was developed on, so it works before anything is adjusted.

Damping Performance

374 +10 / -2 mm of adjustment turns ride height into a setting rather than a fixed dimension. 140 N/mm is the rate Öhlins selected after testing on the R NINET PURE. Öhlins supplies spring 21102-54 with this unit. Piston diameter is 46 mm, which is the figure that decides how hard the oil has to be pushed. Preload is set separately again, and preload is what determines static sag rather than damping. Adjustment is by click rather than by feel, so a setting can be written down and returned to.

Why This Machine Needs It

Öhlins covers the 5-year production run of this generation with a single part number, which means the mounting and the linkage stayed unchanged across it. Retro and heritage machines usually inherit their suspension specification from cost targets rather than from chassis development.

Fitment and Compatibility

Öhlins part number BM 491 is the correct number for the BMW R NINET PURE as built 2016–2020. Nothing about it is generic — the mounting dimensions alone rule out a different model.

Road Approval

Road approval: ABE (Germany) for the BMW R NINET PURE. That means no TÜV appointment and no entry in the registration document — the paperwork comes in the box.

Specifications

  • Brand: Öhlins
  • Part Number: BM 491
  • Fitment: BMW R NINET PURE (2016–2020)
  • Road Approval: ABE (Germany)
  • Mounting Position: Hinten
  • Length: 374 +10 / -2 mm
  • Stroke: 53 mm
  • Spring Rate: 140 N/mm
  • Piston Diameter: 46 mm
  • Spring Part Number: 21102-54
FitmentWhich bikes this fits▼
  • BMW R NINET PURE (2016–2020)
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08 · Paddock

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