Fits BMW R850, R1100, R1150, all models and years, dual media, round filter, dual density

Replaces existing air filter cartridge

Air Filter ULTRA 4 RALLY RAID to allow maximum protection to your BMW engine :

1. Ultra Protective, with filtration down to 30 microns and a extremely high BETA ratio, matching the OEM Paper filter specs,

2. Ultra Performing the much better Air Flow will allow a better engine response and a new sprint in your driving,

3. Ultra Economic from now on, with no need to buy a new filter every time you service the bike, or buy expensive solvent cleaning, then oiling or spraying your foam filter.  Instead you simply simply blow the Ultra 4 with an air hose, then clean with water and light soap, it will be ready for mounting in a matter of minutes clean as new and it’s totally environmentally friendly.   To improve filtering, treat with Rock Factory Eco Foam Air Filter Treatment

4. Ultra Long Lasting the high density homogeneous matrix is robust and will not loose its integrity even after many washing; no cotton thread will get free, no foam particles will enter the combustion chamber because your foam filter disintegrates. The Ultra 4 filter will keep its’ great characteristics FOREVER.



Our relentless research for MAXIMUM PROTECTION for your motorcycle, maintenance cost TOTAL ELIMINATION, and continuous product creation and evolution has taken another step ahead with this REVOLUTIONARY Air Filter.


Filter your air with a re-usable GUGLAtech air filter which meets or exceeds OEM air filter specs.  The filter has a 30-40 micron fabric mesh which cleans the air without restricting flow.

Read this article that describes the development of the Rally Raid filter system:  Developing the Rally Raid – the RATS Machine

Read this article that describes the difference between Guglatech air filters and other types:  Air Filter Blog 2

This is a DRY mesh media filter, meaning it doesn’t need solvents to clean it, or oils to charge it for use, however for improved filtering we recommend treating the upper side of the filter with Rock Factory Eco Foam Air Filter Treatment.  Rock Eco Foam Air Filter Treatment






The mesh is reinforced by a wire screen.  This means the filter can be cleaned with compressed air and soapy water WITHOUT DAMAGE TO THE FILTER.  And that means you can use it over and over again.  Basically, this is the last air filter you’ll ever need for your bike.

Installation is quick and easy, the same process as changing an OEM paper filter.

When installing, run a bead of heavy grease on the rim of the airbox.  This will seal the edge of the air filter to the bike’s airbox, and allow for any distortions on the rim of the box.  When riding off-road or in dusty conditions, we strongly recommend oiling the filter.  This will greatly improve filtration of ultra-fine talcum-like dust.

When ordering please list your bike’s make, model, and year in the order notes.