Öhlins STX 46 Blackline Shock Absorber BMW R nineT /5 (2019–2020) – view 4⟲ 360° — drag me
02 · Data & docs

The facts.

Technical data
BrandÖhlins
Part NumberBM 491
FitmentBMW R nineT /5 (2019–2020)
Road ApprovalABE (Germany)
Mounting PositionHinten
Length374 +10 / -2 mm
Stroke53 mm
Spring Rate140 N/
Piston Diameter46 mm
Spring Part Number21102-54
DescriptionThe whole story▼

Every Öhlins part number covers one machine. BM 491 covers the BMW R nineT /5 (2019–2020). The difference shows up in the second half of a fast road, when the standard unit has warmed through.

Key Features

  • Gas-pressurised monotube damper with the reservoir integrated into the body
  • Fitted spring: Öhlins 21102-54
  • Length 374 +10 / -2 mm, set for this chassis
  • Direct fitment on the BMW R nineT /5 (2019–2020)
  • 53 mm of damper stroke
  • Monotube damper layout
  • Spring rate 140 N/mm, set against this machine's weight
  • Damping piston: 46 mm

Where This Sits in the Öhlins Line-up

Black anodising is applied to the body and reservoir, and the spring is powder-coated black to match. Öhlins introduced Blackline for machines whose own colour scheme fights with yellow-gold. Blackline is the STX 46 with a black-anodised body and black spring rather than the familiar Öhlins gold.

Damping Performance

A 46 mm piston gives the oil a large working area, so the force curve stays flat as temperature rises. 374 +10 / -2 mm of adjustment turns ride height into a setting rather than a fixed dimension. Öhlins identifies the spring as 21102-54. Mounting length is 372/384 mm. Öhlins publishes a baseline setting for each part number, which is the sensible starting point. Compression and rebound are adjusted independently, so support under load can be set without changing how fast the wheel returns.

Construction and Material Quality

Öhlins sets a baseline for each part number on the machine it was developed on, so it works before anything is adjusted. Anodising is hard-coat rather than decorative, which matters on a component exposed to road salt and stone chips. The damper body is hard-anodised aluminium, which resists both corrosion and the thermal cycling a rear shock lives with.

What This Means on the R nineT /5

Heritage bikes are frequently ridden two-up, which exposes a soft standard damper immediately.

Fitment and Compatibility

What follows applies to the BMW R nineT /5 built 2019–2020, which is the machine BM 491 is listed for. Öhlins lists no other machine against this number, so it is not a unit that can be adapted to a neighbouring model.

Road Approval

Road approval: the BMW R nineT /5 is covered by a German ABE for this part number. The certificate is supplied and should stay with the vehicle documents.

Specifications

  • Brand: Öhlins
  • Part Number: BM 491
  • Fitment: BMW R nineT /5 (2019–2020)
  • 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 /5 (2019–2020)
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08 · Paddock

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