Adrian Käser is a retired Swiss sidecarcross passenger and four times World Champion.

In the same season he also participated in two more GP's with different riders in each, Hubert Huwyler and Rudi Herren.

[1] The following season, he only raced in one even, on the side of Rene Raggenbass in the GP of Finland.

He replaced Andreas Hüsser on the side of two-time world champion Christoph Hüsser and the team finished eighth in the world championship as well as taking out the Swiss national title.

[1] In 1993, Käser joined Andreas Fuhrer and the new combination became a dominant force in the world championship, winning four titles in a row from 1993 to 1996,[2] both racing for the Moto-Club Aarberg.