Öhlins STX 36 Twin Shock Absorber Harley Davidson Dyna Street Bob 103 FXDB (2006–2017) – HD 817⟲ 360° — drag me
02 · Data & docs

The facts.

Technical data
BrandÖhlins
Part NumberHD 817
FitmentHarley Davidson Dyna Street Bob 103 FXDB (2006–2017)
Road ApprovalABE (Germany)
Length305 mm
Stroke61 mm
Spring Rate32 N/
Piston Diameter36 mm
Spring Part Number21180-01
Product LineSTX 36 Twin
DescriptionThe whole story▼

HD 817 is the Öhlins number for the Harley Davidson Dyna Street Bob 103 FXDB as sold between 2006 and 2017. The difference shows up in the second half of a fast road, when the standard unit has warmed through.

Key Features

  • Monotube damper layout
  • Overall length 305 mm as specified by Öhlins for this model
  • Spring rate as delivered: 32 N/mm, matched to the Dyna Street Bob 103 FXDB
  • Damping piston: 36 mm
  • Gas-pressurised monotube damper with the reservoir integrated into the body
  • Öhlins spring 21180-01 included
  • Adjustable rebound damping via the knob above the lower eyelet
  • Bolts to the Harley Davidson Dyna Street Bob 103 FXDB (2006–2017) using the standard mounting points

Where This Sits in the Öhlins Line-up

Twin-shock installations load each damper differently from a monoshock, and Öhlins specifies the pair accordingly. Rebound adjustment is at the lower eyelet on most numbers in this range. The STX 36 Twin is built as a pair for exactly this geometry, with a 36 mm piston in a monotube body.

How It Behaves on the Road

At 36 mm the piston is large enough that the shim stack, not the orifice, decides the damping. The spring is wound to 32 N/mm, and alternative rates are catalogue items. The unit measures 305 mm installed, which is the dimension the Dyna Street Bob 103 FXDB's linkage expects. Öhlins identifies the spring as 21180-01. Preload is set separately again, and preload is what determines static sag rather than damping. A single click produces a change most riders can detect, which is not true of every adjustable damper.

Fitted to the Dyna Street Bob 103 FXDB

The 103 cc engine sets how quickly weight transfers, and damping has to be matched to that rather than to a class average. Öhlins covers the 12-year production run of this generation with a single part number, which means the mounting and the linkage stayed unchanged across it. Cruisers carry weight low and long, with short suspension travel doing work that a sportbike would spread over twice the stroke.

Materials and Manufacture

Every Öhlins dealer can re-valve the unit, because the shim stack is a documented, serviceable assembly. Every unit is dyno-tested against the curve held for its part number, not sampled from a batch. The damper body is hard-anodised aluminium, which resists both corrosion and the thermal cycling a rear shock lives with.

Fitment and Compatibility

This listing covers Öhlins part number HD 817 for the Harley Davidson Dyna Street Bob 103 FXDB, 2006–2017. Nothing about it is generic — the mounting dimensions alone rule out a different model.

Road Approval

Road approval: ABE (Germany) for the Harley Davidson Dyna Street Bob 103 FXDB. That means no TÜV appointment and no entry in the registration document — the paperwork comes in the box.

Specifications

  • Brand: Öhlins
  • Part Number: HD 817
  • Fitment: Harley Davidson Dyna Street Bob 103 FXDB (2006–2017)
  • 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 103 FXDB (2006–2017)
07 · Support

Questions, one topic at a time.

Estimate your shipping

Get the real shipping cost for this item to your address — the same rates as checkout.

Pick your countrySame rates as checkout

Choose a destination and hit Estimate — we fetch the live rates for this item.

How long does delivery take?

We’re based in Germany. Standard delivery goes by DHL and national postal services and takes about 2–5 days within Germany, 1–2 weeks within the EU and 2–6 weeks outside the EU. Need it sooner? Express delivery reaches most of the world within a few days — just choose it at checkout where available.

How much does shipping cost?

Your exact shipping cost is calculated by destination and weight and shown at checkout before you pay — no hidden fees. Express delivery is selectable at checkout where available.

Do you ship to my country?

Yes, we ship to over 130 countries. Prices, taxes and delivery times for your destination are calculated automatically at checkout.

Will I have to pay customs or import duties?

Within the EU, no — our prices already include all duties and EU VAT. For deliveries outside the EU (e.g. Switzerland, the UK or the USA), your order may be subject to import duties and taxes set by your country. These are collected by the carrier when your parcel arrives, aren’t included in our prices, and are outside our control.

How can I track my order?

As soon as your parcel ships we email you a tracking link, so you can follow it all the way to your door.

What if an item is out of stock?

On out-of-stock items you can request a delivery time or leave your email to be notified the moment it returns — just use the notification box on the product.

Didn’t find your answer?

Our team will personally help you choose the right gear or part — around 24h for a reply.