Ohlins STX 36 Twin — 1991-2017 Harley-Davidson Dyna FXD

The Ohlins STX 36 Twin is a monotube shock pair for Harley Dyna FXD models, featuring a divided piston design with high-pressure nitrogen charging and precision CNC machining. Adjustable rebound, ride height, and spring preload make it tunable for different loads and riding styles across 1991-2017 Dyna platforms.

Features

• Hard anodized, CNC-machined components
• Divided piston monotube design
• High-pressure nitrogen gas charged
• Adjustable rebound damping
• Adjustable ride height (½ in. range)
• Pin-tool preload adjustment
• 36mm piston
• Low-friction shaft and seal head
• Multiple spring rate options
• Sold as a pair

Specifications

• Brand: Ohlins
• Manufacturer Part #: HD 817
• Type: Monotube Twin Shock
• Piston Diameter: 36mm
• Length Adjustable: ½ in.
• Weight: 12 lb
• Category: Suspension / Shocks and Struts

Fitment

Fits Harley-Davidson Dyna FXD models from 1991 through 2017.

Frequently Asked Questions

Does this fit my Dyna FXDL or FXDWG?

Yes — this shock is designed for all Dyna FXD variants including FXDL, FXDWG, FXDB, FXDC and other FXD-based models 1991-2017.

What adjustments can I make to these shocks?

Rebound damping, ride height (up to ½ in.), and spring preload via the included pin tool. Multiple spring rate options are available to match rider weight and riding style.

Are these sold individually or as a pair?

These are sold as a pair — two shocks ready to install on the rear axle.

Do I need new mounts or brackets to install these?

These are a direct bolt-on replacement for stock Dyna shocks. No additional hardware or frame modifications required.

Can I adjust these on the road, or do I need tools?

Rebound and preload adjustments require the included pin tool and a few minutes. Height adjustment is also pin-based, so all tuning can be done at home or trackside.