Öhlins STX 36 Twin Shock Absorber Harley Davidson Dyna Switchback FLD (2012–2016) – HD 817⟲ 360° — drag me
02 · Data & docs

The facts.

Technical data
BrandÖhlins
Part NumberHD 817
FitmentHarley Davidson Dyna Switchback FLD (2012–2016)
Road ApprovalABE (Germany)
Length305 mm
Stroke61 mm
Spring Rate32 N/
Piston Diameter36 mm
Spring Part Number21180-01
Product LineSTX 36 Twin
DescriptionThe whole story▼

The Öhlins HD 817 exists because the Harley Davidson Dyna Switchback FLD (2012–2016) needed its own settings, not a shared set. A factory shock is set for an average rider on an average road, and few riders are either.

Key Features

  • Adjustable rebound damping via the knob above the lower eyelet
  • Öhlins fits a 32 N/mm spring to this application
  • Monotube damper layout
  • Spring part number 21180-01 fitted
  • Built to 305 mm installed length
  • Piston measuring 36 mm across
  • 61 mm of travel at the damper
  • Gas-pressurised monotube damper with the reservoir integrated into the body

Construction and Material Quality

Seals are specified for temperature stability rather than for the lowest unit cost. Two units carrying the same part number behave the same way out of the box, which is the whole point of testing each one. Every unit is dyno-tested against the curve held for its part number, not sampled from a batch.

Damping Performance

A 36 mm piston gives the oil a large working area, so the force curve stays flat as temperature rises. Spring 21180-01 is what ships with the damper; harder and softer rates are available. Öhlins specifies 305 mm here, so ride height stays as the factory set it. The damper moves 61 mm from full extension to full compression. The adjuster range is usable end to end rather than only around the middle. Öhlins publishes a baseline setting for each part number, which is the sensible starting point.

The STX 36 Twin in Detail

The 36 mm piston suits the shorter stroke and steeper mounting angle typical of a twin-shock frame. Twin-shock installations load each damper differently from a monoshock, and Öhlins specifies the pair accordingly. The STX 36 Twin is built as a pair for exactly this geometry, with a 36 mm piston in a monotube body.

The Dyna Switchback FLD in Particular

A cruiser is often ridden two-up with luggage, which is the load case the standard suspension rarely handles well. This part number spans model years 2012 to 2016; earlier and later generations take different numbers.

Fitment and Compatibility

The fitment stated here is the Harley Davidson Dyna Switchback FLD in its 2012–2016 form, under Öhlins part number HD 817. 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: ABE (Germany). The unit is covered by a German ABE for the Harley Davidson Dyna Switchback FLD, so no individual inspection or entry in the vehicle documents is required. The approval document ships with the product.

Specifications

  • Brand: Öhlins
  • Part Number: HD 817
  • Fitment: Harley Davidson Dyna Switchback FLD (2012–2016)
  • Road Approval: ABE (Germany)
  • Length: 305 mm
  • Stroke: 61 mm
  • Spring Rate: 32 N/mm
  • Piston Diameter: 36 mm
  • Spring Part Number: 21180-01
  • Product Line: STX 36 Twin
FitmentWhich bikes this fits▼
  • Harley Davidson Dyna Switchback FLD (2012–2016)
07 · Support

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