Inseam challenged adventure riders may have cause for celebration.  German motorcycle manufacturer BMW apparently wants to help you.  They have filed a patent application with the US Patent and Trademark Office for a “fluid activated lowering device”.

BMW’s patent application uses some rudimentary drawings showing a fluid-filled reservoir connected to some kind of actuator.  The actuator would change the pressure on the fluid which would “hydraulically” extend or retract a component of the motorcycle’s suspension.  This would result in the lowering/raising of the bike’s ride height.

fluid activated

This drawing shows two iterations of the fluid-filled cylinder connecting to the suspension and an actuator.

BMW clearly states that this setup is different than its Electronic Suspension Adjustment (ESA) and Dynamic Electronic Suspension Adjustment (DESA) systems.  This sole purpose of the fluid-activated lowering device is to quickly lower/raise the bike’s seat height.  It does not adjust the suspension for improved compliance or traction.

fluid activated

A closer view of the system.

The system can be used on both the front and rear suspension of the motorcycle.  However, the methodologies for connecting the device to the suspension differs.

fluid activated

This drawing shows how the lowering device can be used on both front and rear suspension. It also shows two different means to connect the system to the rear suspension.

Interestingly, BMW does not limit its application to a two-wheeled vehicle and also say that the device can be used on a three-wheeled vehicle.  Does BMW have something else up its sleeve for a 3 wheeled motorcycle?

If you are an engineering type you can check out BMW’s actual patent application.


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