Öhlins STX 36 Twin Shock Absorber Harley Davidson Dyna Street Bob FXDB (2006–2016) – HD 817⟲ 360° — drag me
02 · Data & docs

The facts.

Technical data
BrandÖhlins
Part NumberHD 817
FitmentHarley Davidson Dyna Street Bob FXDB (2006–2016)
Road ApprovalABE (Germany)
Length305 mm
Stroke61 mm
Spring Rate32 N/
Piston Diameter36 mm
Spring Part Number21180-01
Product LineSTX 36 Twin
DescriptionThe whole story▼

Öhlins lists part number HD 817 for one machine: the Harley Davidson Dyna Street Bob FXDB built 2006–2016. On the Dyna Street Bob FXDB the rear unit does most of the work of keeping the chassis settled.

Key Features

  • Damping piston: 36 mm
  • Overall length 305 mm as specified by Öhlins for this model
  • Öhlins fits a 32 N/mm spring to this application
  • 61 mm working stroke
  • Monotube damper layout
  • Gas-pressurised monotube damper with the reservoir integrated into the body
  • Adjustable rebound damping via the knob above the lower eyelet
  • Fitted spring: Öhlins 21180-01

How Öhlins Builds It

Spring and damper are separate part numbers, so a rate change does not mean a new unit. Öhlins sets a baseline for each part number on the machine it was developed on, so it works before anything is adjusted. Gas pressure is set at the factory and holds through normal service intervals.

What This Means on the Dyna Street Bob FXDB

Short travel and substantial mass are a hard combination: there is little room to absorb anything, so damping quality matters more. The 2006–2016 generation kept the same chassis dimensions throughout, so one Öhlins number serves the whole run.

The STX 36 Twin in Detail

Classic and retro machines with twin rear shocks are usually let down by their dampers long before their frames. The STX 36 Twin replaces both sides with Öhlins units carrying a 36 mm piston, adjustable rebound and — critically for a bike that carries a pillion — a usable preload range. The 36 mm piston suits the shorter stroke and steeper mounting angle typical of a twin-shock frame.

Damping Performance

At 305 mm it matches the standard unit's installed length exactly. Spring part number 21180-01 is a separate catalogue item, so a rate change is inexpensive. Damper stroke comes to 61 mm on this number. Spring rate is 32 N/mm as delivered, which sets static sag for a rider of typical weight. Compression and rebound are adjusted independently, so support under load can be set without changing how fast the wheel returns. Öhlins publishes a baseline setting for each part number, which is the sensible starting point.

Fitment and Compatibility

Öhlins releases HD 817 against the Harley Davidson Dyna Street Bob FXDB (2006–2016). Nothing about it is generic — the mounting dimensions alone rule out a different model.

Road Approval

Road approval: a German ABE covers this part on the Harley Davidson Dyna Street Bob FXDB. Fit it, keep the certificate with the vehicle papers, and nothing further is needed.

Specifications

  • Brand: Öhlins
  • Part Number: HD 817
  • Fitment: Harley Davidson Dyna Street Bob FXDB (2006–2016)
  • 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 Street Bob FXDB (2006–2016)
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08 · Paddock

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