LuK Challenge Chrono

LuK Challenge Chrono was a road bicycle race held annually as a team time trial for pairs in Bühl, Germany. In 2005 and 2006, the race was organized as a 1.1 event on the UCI Europe Tour. After 2006, the sponsor, LuK, withdrew as part of Germany's general disengagement from cycling amidst a number of doping scandals, and the race did not take place again.

In the past, this race was also known as:
 * 1968 – 1992: Grand Prix Baden-Baden
 * 1993 – 1996: Telekom Grand Prix
 * 1997 – 1999: Grand Prix Breitling
 * 2000 – 2001: Grand Prix EnBW
 * 2002 – 2003: Karlsruher Versicherungs-Grand Prix
 * 2004 – 2006: LuK Challenge (Bühl)