|ABS, fully and part integral|
|Air Damping System|
|Automatic heated grips|
|Brake pad wear indicator|
|Electrohydraulic centre stand|
|Flat twin engine|
|Neck Brace System|
|Onboard communication system|
|RDC (Tyre Pressure Control)|
|Single-sided swing arm|
|Toothed belt drive F 800 S/ST|
|WAD suspension element|
|2-cylinder, in-line, transverse|
With the new rear strut for the HP2 Enduro, BMW yet again presents a world innovation in motorcycle chassis construction. With the new air damping system, air exclusively undertakes both suspension and damping functions - such a gas spring damper system provides a weight advantage of nearly 2 kg compared to conventional struts with steel helical spring and oil damping: the innovative component weighs only 2.3 kg in total.
The basic layout of the air damping system features analogies to conventional struts: a piston travels in a cylinder, but displaces instead of oil air that flows from one chamber into the other. Damping is achieved when plate valves throttle this air flow; suspension is obtained when the trapped air is compressed.
Air as a medium provides the optimal conditions for use in a spring damper system.
On the outside the air damping system consists of an aluminium cylinder that forms the actual strut with two air chambers and gastight rubber bellows that completely seals the strut including the piston rod. The system is therefore protected against soiling, facilitating maintenance and preventing e.g. dust from abrading the piston's O ring. The strut is filled with ambient air through a normal Auto valve; a high pressure hand pump and pressure gauge are included with the product. Varying the filling pressure in the strut means that the motorcycle can be quite easily tuned to various loading states or the seat height can be adjusted. A bubble on the frame indicates the motorcycle's normal position as an adjustment aid. In addition, the only other adjustment facility is a small hand wheel that varies the damping characteristics between the two variants Sport and Competition by opening up a small bypass between the air chambers.